DEPARTMENT OF AGRICULTURE.
DIVISION OF BOTANY.
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PLATES AND DESCRIPTIONS

OF THE .

“ARIZONA, AND SOUTHERN CALIFORNIA. |

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GRASSES OF THE SOUTHWEST.

PLATES AND DESCRIPTIONS

OF THE

GRASSES OF THE DESERT REGION OF WESTERN TEXAS, NEW MEXICO,
ARIZONA, AND SOUTHERN CALIFORNIA.

Pare JO

By Dr. GEO!VASEY,

BOTANIST, DEPARTMENT OF AGRICULTURE.

ISSUED DECEMBER, 1891.
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURB,

WASHINGTON :
GOVERNMENT PRINTING OFFICE.
ESO

NOTE. |

This bulletin constitutes the second half of the first volume of a worl
Illustrations of North American Grasses. It is designed to continue the

a second volume to be entitled Grasses of the Pacific Coast. af

Pa ken O eal KAN SMa A

WASHINGTON, August 3, 1891.
Str: I have the honor of herewith presenting for publication the manuscript
of the second part of the Bulletin on the ‘‘ Grasses of the Southwest.”
GEORGE VASEY,

Botanist.
Hon. J. M. Rusk,

Secretary of Agriculture.

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INTRODUCTION.

This second part of the Grasses of the Southwest presents, like the first part,
plates and descriptions of 50 species of grasses, together making 100.

The synonymy of such as have had several names is briefly given. Most of
the species, however, are either new, or so little known that they have received
but asingle name. The drawings were made by Messrs. Scholl, Olszewski, and
Holm, and in the details are generally very accurate. Iwish to express my obliga-
tions to Mr. L. H. Dewey, Assistant Botanist, for important assistance in describing
the species.

GEO. VASEY.
AUGUST 3, 1891.

5

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Plate.

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GRASSES OF THE SOUTHWEST.

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No. 1.
ELIONURUS DRIPSACOIDE SHER ake 9 (i, ciliaris Hl. 1B, IK.)

Plant perennial, wath short rootstock, smooth throughout or with slight pubes-
cence near the ligule.

Culms, loosely tufted, erect, branching, solid, terete, glabrous and shiny, 2 to
4 feet tall. ;

Leaves; radical few, the broad loose sheaths tapering into the long involute
blades with scarcely a contraction at the ligule; of culm 6 to 12; sheaths rather
loose, open above, lower ones exceeding internodes, upper ones shorter; blades in-
volute, slender, 4 to 12 inches long; ligule membranaceous, ciliate, truncate, + line
long or less.

Inflorescence consisting of a terminal, and several distant, long-peduncled,
lateral spikes. Spikes linear, 3 to 4 inches long, cylindrical; two appressed, 1-
flowered spikelets at each node of the hairy rachis, one sessile and perfect, and one
staminate on a stout hairy pedicel 15 lines long.

Sessile spikelet narrowly lanceolate; first glume amecoplites nearly flat, bifid
at apex, acute or obtusish, rigid, hextaceouet ciliate on the prominent marginal
nerves, 5 to 7 other less prominent nerves; second glume lanceolate, membrana-
ceous, smooth, obscurely 3-nerved, 24 to 3 lines long; third and fourth glumes
lanceolate, acute, scarious, thin, smooth, the third ciliate, obscurely 3-nerved, 14
to 24 lines long; palet small or wanting; pedicellate spikelet similar, but all parts
smaller and the first glume always acute at apex; stamens 3. _

PuatE I; A, two spikelets, lower one perfect, upper one staminate, a to f,
parts of perfect flower; a, first empty glume, extreme forms, dorsal view; and ),
ventral view; c, second empty glume; d, third empty glume; e, floral glume; f,
palet. Capital letters A, E indicate corresponding parts of staminate flower.

Dr Havard states that this grass constitutes a large portion of the vegetation
of the plains of southern Texas. It occurs in Mexico, and also in Florida,

PLATE I

No, 2.
HILARIA RIGIDA (Thutb.) Serib. (Plewraphis riqida, Thurb.)

Plant perennial, rigid, woody throughout, except the young growth, with
hard creeping rootstock sending up scaly branches.
Culms spreading or ascending, branching freely, solid, 1 to 2 feet tall, woolly
below.

Leaves of rootstock appressed, scarious scales; of culm often 2-ranked and
rather crowded; sheaths longer than internodes, close, woolly; blades inyolute,
pungent, rigid, 1 to 3 inches long; ligule a dense white, woolly collar.

Inflorescence a narrow, white or purplish spike, 2 to 3 inches long, formed
of obovate clusters of 3 sessile spikelets at each node of the rachis.

Spikelets; lateral ones in the cluster staminate and 2- to 5-flowered, middle one
perfect and 1-flowered; empty glumes all about 3 lines long, forming an involucre
about the cluster; first glume of staminate spikelet oblong, wider above, oblique,
conspicuously ciliate, 5-nerved, 1 or 2 of the nerves on one side extended in short
dorsal awns, second glume obovate, 2-lobed and ciliate above, 5-to 6-nerved, with
1 or 2 dorsal awns; floral glumes oblong or wedge-shaped, nearly equally 2-lobed
at apex or merely obtuse, ciliate, 3-nerved, midnerve slightly excurrent, and one
lateral nerve rather obscure, 2 to 25 lines long; palet oblong, truncate, slightly
scabrous on the two nerves above, 2 lines long; empty glumes of perfect
flower equal, at the back of the cluster, narrow, cuneate, oblique above, 4 to
6 awned, ciliate, 2 to 3 lines long including awns; floral glume oblong, equally
2-lobed, ciliate, 2 to 3 lines long, 3-nerved, lateral nerves equal and slightly excur-
rent, midnerve excurrent in an awn 4 to 1 line long; palet lance-oblong, obtuse,
ciliate or lacerate at apex, 2-nerved, 2 to 3 lines long; stigmas 2, long, plumose.

Grains; no mature grains found.

PuateE IT;-a to d, parts of staminate flower; a, first empty glume; 6, second
empty glume; ¢, floral glume; d, palet; e, perfect flower with its two empty
glumes; f to h, parts of perfect flower; 7, floral glume; g, palet; h, empty glume.

New Mexico and Arizona; almost the only grass on the driest desert land;
commonly called Gayetta grass. It is considered a valuable grass.

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PLATE it

No. 3.
PASPALUM DISTICHUM Linn.

Plant perennial, the long creeping rootstocks rooting at the nodes and forming
a rather close sod, nearly glabrous or sometimes pubescent, somewhat glaucous.

Culms one or two in a place ascending from the nodes of the rootstocks,
branching, solid, angular below, 1 to 2 feet tall.

Leaves variable; of rootstocks mostly broad, loose, membranaceous scales; of
culms 5 to 7; sheaths rather loose, closed, rarely compressed and open, striate;
blades flat or slightly involute, 2 to 23 lines wide, 2 to 6 inches long; ligule an
inconspicuous tawny, lacerate fringe, decurrent.

Inflorescence of 2 rarely 3, narrow, erect, approximate spikes, 1 to 243 inches
long, the lower one raised on a short internode of the axis; rachis flat, bearing the
two crowded rows of sessile spikelets in alternate ranks.

Spikelets broadly oblong-lanceolate, flattened, 1-flowered, 1 to 14 lines long;
first and second glumes equal, broadly lanceolate, 3-nerved or unsymmetrically
4-nerved; first acute, 1 line long, smooth; second with short, loose pubescence;
floral glume broadly lanceolate, smooth, indurated, 3-nerved, 1 line long; palet
indurated, ovoid, inclosing grain, acute, obscurely 1-nerved, 1 line long and quite
as broad.

Grain elliptical-lanceolate, flattened, nearly black at maturity, minutely
roughened, | line long; falling with the enveloping palet and glume. Stigmas 2,
purple, prominent.

PuAtE III; a, first empty glume, dorsal view; b, second empty giume; c,
flowering glume, inside view; d, palet and stamens; e, pistil.

Common in the Southern States, Texas, and westward to California, Near the
Gulf, and in moist ground it forms valuable pasturage.

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No. 4.
IPYNSIPYZNIEIOIME JEIDVWAUD OME sb ienim,

Plant perennial, coarse, somewhat tufted on a short rootstock.

Culms few in a place, erect, or decumbent, geniculate below, solid, terete, 2 to
3 feet tall.

Leaves; radical mostly scarious; of cul 6 to 9; sheaths equaling or exceeding
internode, loose, often Compressed and open, lower ones often pubescent; blades
flat, hispid above and below toward the tip, 3 limes wide, 2 to 6 inches long; ligule
a tawny, lacerate, membranaceous fringe, 4 line long, decurrent.

Inflorescence a racemose panicle of 4 to 8 approximate spikes, alternate on the
flattened axis, 2 to 4 inches long; spikes unilateral, sessile, 1 to 14 inches long;
rachis flat and smooth, + line wide, usually purplish.

Spikelets crowded, usually in 4 rows, sessile or on short pedicels, oblanceolate,
flattish, 1-flowered, 1 to 14 lines long; first glume broadly ovate, acute, slightly
convex, Slightly roughened on back, 3-nerved, lateral nerves marginal and joining
midnerve at apex, | line long; second glume same but flat and slightly smaller;
floral glume, indurated, round on back, with inrolled margins, very obscurely
3-nerved, # line long; palet broadly oval, indurated, nearly flat. with irregular,
hyaline margins below enfolding the seed, obscurely 2-nerved, nearly 1 line long.

Grain; a careful search through 18 specimens produced but one perfect grain
and that immature, but old enough to show the form, obovate, rounded, flattened

on both sides 4 line long.

Puate IV; a, first empty glume; b, second empty glume; c¢, floral glume,
stamens, and pistil; d, palet, ventral view, with two membranaceous lobes turned out.

Found in southwestern Texas; common in Mexico,

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No. 5.
PASPALUM PUBIFLORUM Rupt.

Plant perennial, coarse, rather glaucous.

Rootstock creeping, branching, and often rooting at the nodes.

Culms few in a place, sometimes loosely tufted, ascending or nearly erect,
geniculate below, branching, solid, angular below, nearly terete above, smooth,
18 to 30 inches tall, the lower joints woolly.

Leaves of rootstocks rather coarse, loose scales; of culms 3 to 7; sheaths shorter
than internodes, loose, smooth, often with a few scattered hairs along the upper
margin; blade flat, 8- to 10-nerved, sparsely ciliate, 3 to 5 lines wide, 4 to 8 inches
long; ligule membranaceous, ovate, lacerate, 15 lines long, decurrent.

Inflorescence 3 to 6 narrow, spreading spikes, alternate along the angular axis,
2 to 3 inches long; rachis flat, bearing 2, often 4, rows of crowded spikelets in alter-
nate rows.

Spikelets broadly oblong or ovate, 1-flowered, 1 to 14; lines long; first glume
broadly oval or hemispherical, with infolded margins, usually softly-pubescent,
3-nerved, 14 to 14 lines long; second glume broadly oval, flat, with infolded mar-
gins, nearly smooth, 3-nerved, of the same length; floral glume indurate, ovate-
oblong, convex, with infolded margins, smooth, obscurely 3-nerved, 1 line long;
palet indurated, broadly ovate, flat, with infolded margins, smooth, obscurely
2-nerved, 1 line long.

Grain oblanceolate, thick, flat on one side, shiny, dark-brown at maturity, not
translucent, 1 line long, falling free or with indurated enveloping palet.

PEATE Vie a, spikelet, side view; 0, first empty glume; c, second empty glume;
d, floral glume; e, palet and stamens; f, pistil.

Common in Texas and extending to southern California. In the Southern
States is a form with smooth spikelets. Probably a valuable pasture grass.

Julius Bien & Co lith

No. 6.

PHALARIS INTERMEDIA Bose. var. ANGUSTA Chap. (P. an-
gusta Nees.).

Plant perennial, rather coarse, usually glaucous throughout.

Culms somewhat tufted, erect, sometimes branching below, terete, smooth, or
scabrous above, 2 to 4 feet tall.

Leaves; radical, few, 2 to 4inches long, scarious in mature specimens; of culm
4 or 5; sheaths usually shorter than internodes, rather loose, close, smooth, blades
flat, taper-pointed, scabrous on both sides, 3 to 5 lines wide, 3 to 6 inches long;
ligule prominent, membranaceous, obtuse, lacerate in age, 2 to 3 lines long.

Inflorescence a dense, cylindrical spike 4 inch in diameter, 2 to 4 inches long;
the shortly-pedicellate spikelets crowded on short, much divided, appressed
branches.

Spikelets with one perfect flower, and two opposite, small rudimentary scales
or glumes below the perfect flower and closely appressed against it, 15 to 2 lines
long; first and second glumes nearly equal, lanceolate, acute, carinate, slightly
winged on keel above, herbaceous, hispid on keel, 13 to 2 lines long; flowering
glume coriaceous, lanceolate, acute, rounded, completely enveloping grain, clothed
throughout with short, appressed,.brittle hairs, nearly smooth and shining at ma-
turity, light-brown, 15 lines long; palet narrow, pubescent, 1 line long, 1-nerved.

Grain oval, slightly compressed, and with small hook at apex, whitish, ? to 1
line long, inclosed in flowering glume from which it is extracted with difficulty.

PLATE VI; a, empty glumes; Bb, floral glume; ec, palet.

Grows from Florida to Texas and California. In Texas it has been cultivated,
and is a very proiific and valuable grass.

PHALARIS INTERMEDIA, BOSC. VAR.ANGUSTA, &

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PLATE V. |

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INO, 7,
ARISTIDA PURPUREA Nutt.

Plant annual or short lived perennial, often purplish especially in the inflor-
escence.

Culms tufted, erect, slender, not branching, nearly smooth, 1 to 2 feet tall.

Leaves; radical and of radical shoots with narrow, close sheaths and slender
involute blades, 4 to 10 inches long; of culm 3 or 4; lower sheaths longer than inter-
nodes, upper ones much shorter, close, smooth ; blade involute, hispid above, 3 to
6 inches long; ligule a line of fine short hairs. somewhat hairy at the sides.

Inflorescence rather loose, narrow, erect or slightly nodding panicle, 4 to 6
inches long; branches 2 or 3 at each node, unequal, the lower 1 to 2 inches long,
naked below, each bearing 2 to 5 pedicellate or nearly sessile spikelets.

Spikelets narrow, 1-flowered, 5 to 6 lines long; first glume narrowly lance-lin-
ear, emarginate, mucronate, rounded, hispid on keel, 1-nerved, 4 to 45 lines long;
second glume same but nearly 2 lines longer; stipe hairy, $ line long; floral glume
linear-lanceolate, rounded, slightly hispid on the nerve above, 4 lines long, termi-
nating in 3 separate, slender, minutely hispid awns 1 to 2 inches long; palet obo-

rate, thin, 3 to $ line long.

Puate VII: a, spikelet twice as large as natural size.
Abundant on plains and ridges, in several varieties, from Texas to British

America. It is the earliest available grass for cattle in the spring, but of little
value when mature.

Julius Bien & Co lith

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VAR.

PUREA, Kth.

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ARISTIDA

No. 8.
STIPA PENNATA Linn. var. Neo Mexicana Thurb.

Plant perennial with strong coarse roots.

Culms erect, densely tufted, not branching, hollow, smooth, 1 to 3 feet tall.

Leaves of radical shoots numerous, with round, close, smooth sheaths, and
narrow Closely involute blades, 10 to 12 inches long; of culm 3 to 4, sheaths smooth,
usually exceeding internodes; blades like those of radical shoots but shorter; lig-
ules membranaceous, rounded, and ciliate above, less than 4 line long.

Inflorescence a narrow racemose panicle 4 to 5 inches long; branches almost
appressed, the lower 2 to 3 inches long, each bearing 1 to 3 pedicellate spikelets.

Spikelets 1-flowered; first and second glumes nearly equal, lanceolate, long;
awn-pointed, herbaceous, 5 to 7-nerved, 14 to 15 inches long; floral glume terete,
coriaceous, yellow, clothed throughout with close appressed pubescence, 5 to 7 lines
long, contracted at the apex, terminating in a twisted, bent awn, feathered above,
4 to 6 inches long; palet narrowly terete, hard, smooth, 5 to 6 lines long.

Grain narrow, reddish, 2 to 3 lines long.

Puate VIII; a, spikelet dissected, about natural size.

Texas, New Mexico, and Arizona,

PLATE VII.

No. 9.
STIPA SCRIBNERI Vasey.

Rootstock short, horizontal, with coarse fibrous roots.

Culms tufted, erect, terete, smooth, 14 to 24 feet tall, unbranched.

Leaves; from base half as long as the culm; of stem 3 or 4; sheaths smooth,
or lower ones slightly scabrous, nearly equaling or slightly exceeding the inter-
nodes, close; blade flat below, involute above toward the long tapering point, mid-
nerve inconspicuous, | to 2 lines wide, 4 to 10 inches long; ligule truncate, 1 line
long.

Inflorescence an erect slender panicle, its base inclosed by the upper sheath,
* narrow and close, 5 to 8 inches long; rachis slightly angular, not Hexuous; branches
in twos or threes, appressed, 1 to 2 inches long, each bearing 2 to 4 spikelets on
short pedicels.

Spikelets 1-flowered; empty glumes unequal, the first 6 to 7 lines, and second
5 lines long, linear-lanceolate, acuminate, both 3-neryed, smooth; floral glume
about 4 lines long, white-hairy, the hairs longer above forming a crown or tuft 1
line long; awn rather slender, 8 to 9 lines long, not hairy; stipe short, acute; palet
less than 1 line long, obtuse, and adherent to grain.

Grain nearly cylindrical, yellow, opaque, 2 to 24 lines long.

PLATE IX; a, spikelet dissected and enlarged.

Arizona and New Mexico. Generally in strong tufts.

-

«

WR Schott, del.

No. 10.

ORYZOPSIS MEMBRANACEA (Pursh.). (Stipa membranacea Pursh.)
Eriocoma cuspidata Nutt.)

Plant perennial, closely tufted, thickened at base.

Culms slender, nearly erect, not branching, geniculate, solid, terete, smooth,
12 to 18 inches tall.

Leaves; radical, numerous, the scarious sheaths clustered thick about the base
of the culms; blades involute, smooth, 6 to 10 inches long; of the culms 3; lower
sheaths shorter than internodes, smooth and close, upper sheath longer and loose;
blades like those of radical leaves; ligule membranaceous, ovate, acute, or lace-
rate, 1 line long, prominently decurrent.

Inflorescence a very loose, erect or flexuous panicle 4 to 6 inches long, included
at the base, usually with 2 or 3 nearly equal axes: branches mostly in pairs, dis-
tant, horizontal, divided in pairs beyond the middle, bearing solitary spikelets on
long flexuous pedicels.

Spikelets 1-flowered, 3 lines long; first and second glumes equal, inflated and
widened below, narrowed above to a long sharp point, scarious except the 5 rather
obscure nerves, minutely pubescent throughout, 3 lines long; floral glume ovoid
or oblong, hard, dark-brown, profusely clothed with long white hairs, 13 lines
long, obscurely nerved, terminating in an awn 2 lines long, which falls at maturity;
palet conical, smooth, hard, brown, obscurely nerved, 13 lines long.

Grain oval, light-yellow, $ line long.

PLATE X; a, spikelet; b, empty glumes; c¢, floral glume, with hairs and awn;
d, same after hairs and awn have fallen; e, palet. In the floral glume, c, the awn
should be represented more to one side,

Texas to California, northward to British Columbia, usually in sandy or grav-
elly soil. A valuable grass. The large seeds are nutritious, and cattle fatten
where the grass is abundant.

No. 11.
ORYZOPSIS FIMBRIATA Hemsl. (Stipa fimbriata Kth.)

Culms tufted with many root leaves at base, erect, striate, smooth, slender, 1 to
2 feet tall.

Leaves of stem 2 to 4; lower sheaths much shorter than internodes, closely
wrapping the culm with the membranaceous inner fold; blade filiform, involute,
4 line wide, 1 to 3 inches long, much exceeded by the involute setaceous root leaves;
ligule conspicuous, obtuse, wider than blade, 1 line long.

Inflorescence a loose, erect, or spreading panicle, 4 to 6 inches long; rachisangu-
lar, sightly scabrous, flexuous toward apex, branches in twos or threes, spreading
or lower ones even deflexed, filiform, 1 to 2 inches long, each bearing 2 to 4 spike-
lets on pedicels 3 to 5 lines long.

Spikelets obovate, 2 to 2% lines long; first glume broadly lanceolate, upper
half scarious with acuminate apex, often purplish, 5-nerved, smooth, 2 to 24 lines
long; second glume same but slightly smaller; floral glume coriaceous, orbicular,
obscurely 5-nerved, covered with loose white hairs longer at base, and bearing a
smooth flexuous awn 5 to 8 lines long; palet obovate, acuminate, 2-nerved, 14 lines
long.

PLATE XI; a, spikelet dissected and enlarged; b, panicle at maturity.

Texas, New Mexico, and Arizona,

, Bel,

WL. Schott

ORYZOPSIS FIMBRIATA ,Zems.

No. 12.

MUHLENBERGIA BUCKLEYANA Scribn. (iluhlenbergia Texana
Buckl. not Thurb.)

Plant annual, diffuse, spreading. :

Culms tufted at base, spreading, terete, slender, smooth, branching below, 10
to 15 inches tall.

Radical leaves few and small; of culm 1 to 3, usuall y 2; sheaths rather loose,
somewhat vaginate, or compressed and open, slightly scabrous, longer than inter-
nodes; blade flat or involute, scabrous on both sides, 1 to 2 inches long.

Inflorescence an oblong, loose, spreading panicle 4 to 8 inches long; rachis and
branches slender, terete, often purple, the latter mostly alternate, 1 to 3 inches long,
bearing solitary spikelets on slender pedicels 1 to 2 lines long.

Spikelets narrowly lanceolate, 1-flowered, 1 line long; first glume ovate, acute,
hyaline, pubescent, 1-nerved, $ line long with a very short awn; second glume
same but little larger; floral glume oblong’, 2-toothed at apex, + to 1 line long,
d-nerved, slightly pubescent on the nerves, midnerve excurrent in an awn as long
as the glume; palet lanceolate, nearly acute, thin, 2-nerved, + line long.

Grain narrowly obovate, rounded at apex, compressed, reddish-amber, 4 line
long, falling with floral glume and palet but easily escaping.

PLATE XII; a, spikelet enlarged; b, empty glumes; c¢, floral glume; d, palet,

Texas, New Mexico to Mexico on rocky hills,

TL. Hot, det.

mr SAE KOT BSS
— SSS SSS ee ee =
SSS SSS SS

“
See

_ MUHLENBERGIA BUCKLEYANA, Scribd.

ase Ne ek Ys

No. 13. .
MUHLENBERGIA NEO-MEXICANA Vasey.

Plant slender, tufted, perennial, from thick, knotted, or sometimes creeping
rootstocks. 3

Culm branching freely below, erect, slender, terete, nearly smooth, 12 to 18
inches tall.

Leaves ; of culms 4 to 6; sheaths longer than internodes. close, slightly rough-
ened; blades erect, appressed, closely involute and setaceous, 2 to 3 inches long;
ligule an irregular, ovate, lacerate membrane + line long. ,

Inflorescence a narrow, erect or slightly nodding panicle, 3 to 4 inches long,
often purple; branches alternate, erect, hispid, 4 to 1 inch long, bearing rather
close clusters of spikelets on hispid pedicels 4 to 14 lines long.

Spikelets narrow, 1-flowered, 2 lines long; empty glumes equal, lance-ovate,
acute, carinate, hyaline, 1-nerved, 1 line long, terminating in a slender awn + to 4
line long; floral glume narrowly conical, lanceolate, acute when unrolled, thin,
smooth, minutely pubescent at base, 3-nerved, terminating in an awn 4 inch long;
palet obscurely 2-nerved, 2 lines long, often projecting out of the floral glume;
stamens 3.

Grain, none present in the 24 specimens examined.

PLATE XIIT; a, panicle at maturity; b, cluster of spikelets; c, spikelet enlarged.

Rocky ledges, New Mexico and Arizona,

=
Et
=i
=
KS
Aa,

D. Olszewski, heb

yet

RGIA NEO-MEXICANA, Vasey.

No, 14.
MUHLENBERGIA SCHAFFNERI Fourn.

Plant low, annual or short-lived perennial.

Culms tufted, procumbent or spreading, branching freely, 2 to 4 inches tall.

Leaves ; radical, few and small; of culm 3 to 5; sheaths compressed, open,
striate. scabrous on both sides, margins white, } to 1 inch long; ligule membrana-
ceous, lacerate, # line long, decurrent in prominent hyaline margins on the sheath.

Inflorescence a narrow contracted panicle, | to 2 inches long, often included at
base, rachis and branches angular, hispid.

Spikelets sessile, appressed, narrow, 1} to 2 lines long; first glume lanceolate, the
apex lobed, with 2 short unequal or nearly equal teeth at apex, hispid, 2-nerved, her-
baceous, rigid, 1 to 14 lines long; second glume linear-lanceolate, acute, carinate,
short-awned at apex, hispid, 1-nerved, 13 to 24 lines long, including awn; floral
glume ovate, 2 minute hyaline teeth at apex, slightly hispid, ciliate below, 3-nerved,
with slender awn 2 to 2 lines long, or sometimes awnless; palet ovate, acute,
2-nerved, thin, smooth, 14 to 13 lines long.

Grain narrowly cylindrical, reddish amber color, ¢ line long, falling with palet
and glume but easily escaping.

Puate XIV, No. 2, lower figure; a, first empty glume; b, second empty
glume; ¢, floral glume; d, palet.

Arizona.

No. 14.
MUHLENBERGIA DEPAUPERATA GSerib.

Plant low, tufted, annual or short lived perennial.

Culms spreading, branching at each node, 3 to 4 inches tall.

Leaves; radical, few or none; of culm 2 to 4, with loose, smooth, broad, open
sheaths, and short folded or involute blades; ligule membranaceous, lacerate, de-
current.

Inflorescence a narrow, contracted, rather close panicle, 2 to 3 inches long,
usually included below, rachis and branches angular, hispid, pedicels short.

Spikelets narrow, 1-flowered, 15 to 2 lines long; first glume ovate, obliquely
2-toothed at apex, scarious, minutely hispid, obscurely 1-nerved, ? to 1 line long;
second glume lanceolate, narrowing at apex to a slender, awn-like point, scarious,
minutely hispid, 1 to 1; lines long; floral glume narrowly lanceolate, with 2 minute
teeth at apex, rounded on back, hispid, 3-nerved, 13 to 2 lines long, midnerve
excurrent in an awn 2to 5 lines long; palet lanceolate, acuminate, rounded, envel-
oping grain, minutely pubescent, 2-nerved, 1; to 1? lines long.

Gram narrowly cylindrical, reddish-amber, lighter above, 1 line long, falling
with palet and glume but easily escaping.

PLatTE XIV, No. 1, upper figure; a, spikelet enlarged; b, empty glumes; c¢,
floral glume; d, palet.
Very close to M. Schaffneri and perhaps but a variety of it,

Arizona,

PLATE XIV.

ILENBERGIA- DEPAUPERATA, Sori.

No. 15.
LA“OOIRUS, IPI IAOVID IAS) 1k by 1K,

Plant perennial from thickened, slightly bulbous base.

Culms tufted, erect or ascending, rather weak, branching, solid, nearly terete,
smooth, 1 to 2 feet tall.

Leaves; radical numerous, with short, close sheaths and flat, folded or invo-
lute blades 1 to 2 inches long, with white margins and midrib; of culm 4 or 3;
sheaths much shorter than internodes, loose and open, smooth; blades like those
of radical leaves but longer; ligule membranaceous, ovate, acute, oblique, decur-
rent on one side, 1 line long.

Inflorescence a dense,. cylindrical spike + inch in diameter, 2 to 3 inches long.

Spikelets 1 to 3 on each of the short branches of the rachis, one or two of
which are commonly imperfect; first glume oblong, thin, 2-nerved, $ to ? line long,
terminating in 2 or (rarely) 3, unequal, hispid awns, 1 to 3 lines long; second glume
ovate, acute, carinate, membranaceous, I-nerved, ? to 1 line long, terminating in
an awn 2 to 3 lines long; floral glume lanceolate-oblong, acute, pubescent through-
out, thicker than the empty glumes, 3-nerved, 1? to 2 lines long, terminating in a
hispid awn 13 to 2 lines long; palet lanceolate, 2-toothed at apex, rounded, 2-nerved,
thinly pubescent, 13 lines long; the flowers are subject to the attack of an insect,
which renders the palet inflated and hardened below.

Grain narrowly lanceolate or linear, yellow, 4 line long.

PuaTE XV; A, perfect spikelet, with abortive spikelet below; a, spikelet with
the palet distorted; 6, first empty glume; c, second empty glume; d, floral glume,
ventral view; e, palet; f, palet of pistillate flower distorted by an insect.

Texas and Mexico, northward to Colorado.

SO

No. 16.

SPOROBOLUS ARGUTUS Kth. (Vilfa Arkansana Trin. Vilfa arguta
Nees.)

Plant annual, smooth throughout except the scabrous margins of the leaves.

Culm tufted, spreading, weak, branching below, smooth, 6 to 12 inches tall.

Leaves of radical shoots numerous, with mostly smooth, loose, scarious sheaths
and flat blades 2 to 3 inches long; of culm 2 or 3, lower sheaths mostly shorter
than internodes, close; blades like those of radical shoots, but upper ones much
shorter; ligule a line of short tawny bristles.

Inflorescence a rather narrow or sometimes spreading, erect panicle, 2 to 3
inches long, often included at base; branches 3 to 5 at base, alternate above, divided
and bearing many pedicellate spikelets on the outer two-thirds.

Spikelets oblong-ovate, 1-flowered, ¢ line long; first glume oblong, obtusish,
thin, hyaline, smooth, 1-nerved, ? line long; floral glume lance-ovate, acute, thin,
1-nerved, § line long; palet broadly ovate, thin, obscurely 2-nerved, 3 line long.

Grain elliptical, compressed, light-brown, with reddish scar, utricular, falling
free.

PuLaTE XVI; a, empty glumes enlarged; 0, floral glume and palet inclosing
grain.

Texas to Arizona and Mexico.

PLATE ZV}.

D.Olsxewskt, del.

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SSS SS = =
Ox = = SL
SS rar IST OF
yea

a
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St <— TEE Z : = —— oe = ~ —
PFE oo Po as ) == Yo E = PAGS

eee

IN@, 177,
SPOROBOLUS BUCKLEYI Vasey.

Culms erect, loosely tufted, slender, not branching, compressed, especially
below, smooth, 2 to 3 feet tall.

Leaves; radical, few, sheaths green or purplish, compressed, tapering into
slender, mostly folded, smooth, long pointed blades, 6 to 15 inches long, green at
maturity; of culm 4 or 5; sheaths mostly exceeding internodes, lower ones com-
pressed and open, upper close, blades like those of radical leaves; ligule a minute
tawny fringe.

Inflorescence a loose, spreading, erect panicle, 10 to 15 inches long; branches
spreading or becoming reflexed, mostly alternate, 3 to 5 inches long, slender, bear-
ing beyond the lower third, short branches of pedicellate spikelets.

Spikelets obovate, 1-flowered, 3 line long; first glume lanceolate, acute, thin,
smooth, 1-nerved, 4 line long; second glume same, but nearly twice as large; floral
glume ovate, acuminate, hyaline, smooth, 1-nerved, 3 line long; palet lance-ovate,
acute, obscurely 2-keeled, 3 line long, in age splitting to the base.

Grain elliptical-globose, utricle light-brown, 4 line long.

PLATE XVII; a, spikelet enlarged.
Well distinguished by the large panicle of capillary branches and many
flowered, small spikelets. A handsome species.

Texas to Mexico.

Aa, Ny

DIY ) ah
MARAT SN,

Poot Te >

v
a _ Vary

fey.

BUCELEYL, %

ON rel

No. 18.

SPOROBOLUS INTERRUPTUS Vasey. (Vilfa interrupta Vasey in
Special Report No. 63, Department of Agriculture, 1883.)

Plant perennial, with densely tufted, bulbous base.

Culms erect, not branching, smooth, terete, 1 to 2 feet tall.

Leaves; radical and from radical shoots, numerous, with scarious, often red-
dish, glabrous or pubescent, tapering sheaths, and mostly flat, smooth or loosely
pubescent erect blades, 3 to 5 inches long; of culm 2 or 3; sheaths longer than in-
ternodes, close, open above, smooth blades, mostly involute, erect, 1 line wide, 1
to 3 inches long; ligule a narrow ciliate fringe.

Inflorescence a narrow, open or interrupted, erect panicle, 4 to 6 inches long;
rachis flexuous, branches alternate or verticillate below, in twos or threes above,
1 to 2 inches long.

Spikelets short-pedicellate, narrow, 1- or 2-flowered, 2 to 3 lines long; first
glume lanceolate, acute, carinate, scarious, smooth, 1-nerved, 1 to 14 lines long;
second glume ovate-lanceolate, nearly twice as large; floral glume ovate-lanceo-
late, acute, membranaceous, smooth, I-nerved or obscurely 3-nerved above. 2 to 3
lines long; palet broadly lanceolate, bifid at apex, thin. hyaline, smooth, slightly
2-keeled, 2 lines long; anthers 3, long, reddish purple; stigmas 2, greenish,
plumose.

Grain, no mature grains seen.

Pirate XVIII; a, spikelet enlarged; b, empty glumes; c, floral glume; d,
palet; 2, typical panicle.

Arizona.

—

1
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T
fel

te

pied Nel eh

LT Holm, del.

Bhi’
en

No. 19.
SPOROBOLUS TRICHOLEPIS (Torr). (Vilfa tricholepis Torr.)

Plant slender, perennial, often purplish in culm and inflorescence, smooth
throughout.

Culms tufted, erect, seldom branching, smooth, slightly compressed, 1 to 2
feet tall. 5

Leaves of radical shoots with rather loose, scarious sheaths and narrow invo-
lute blades 2 to 4 inches long; of culm 2 or 3; sheaths close, nearly equaling or

xceeding internodes, blades involute, erect, 2 to 3 inches long; ligule membrana-
ceous, truncate, lacerate, decurrent, 4 line long or less.

Inflorescence an ovate, pyramidal, erect, or flexuous panicle, 4 to 6 inches long;
branches mostly alternate, slightly spreading, 1 to 2 inches long, divided and
rather loosely flowered on the upper two-thirds.

Spikelets on long slender pedicels, lanceolate, 1-flowered, 13 lines long; first
and second glumes nearly equal lanceolate, acute or obtuse, carinate, thin, smooth,
1-nerved, 1 to 14 lines long; floral glume lanceolate, acute, or obtuse, mem-
branaceous, pubescent or villous on the 3 nerves, 15 lines long; palet lanceolate,
acute, membranaceous, slightly ciliate above, pubescent on the 2 approximate
nerves, or nearly smooth, 14 lines long.

Grain narrowly elliptical, compressed, yellow, 4 line long.

PLATE XIX; a, empty glumes; 6, floral glume and palet opened to show
stamens and pistil.

Mexico northward to Colorado.

D.Otszewske, det.

5
=
4
Ba
fx],

TRIGHOL

ee “i,
Peon

No. 20.
SPOROBOLUS WRIGHTII Munro in Herb.

Plant perennial, coarse, with thickened bulbous base.
~Culms erect, not branching, terete, smooth and shining, 2 to 4 feet tall.

Leaves; radical, few, scarious sheaths at maturity; of culm 4 or 5; sheaths
mostly exceeding internodes, closed, slightly hairy at the throat; blades flat or
involute, 2 or 3 lines wide, 1 to 2 feet long; ligule a minute fringe.

Inflorescence a slender, erect, lanceolate panicle, 10 to 13 inches long; branches
mostly alternate, slender, erect-spreading, | to 4 inches long, bearing many shortly-
pedicellate spikelets on the outer two-thirds.

Spikelets lanceolate, 1-flowered, 1 line long; first glume ovate, barely acute,
membranaceous, l-nerved, 4 to + line long; second glume same, but twice as large;
floral glume broadly lanceolate, acute, membranaceous, smooth, 1-nerved, # line
long; palet lanceolate, cleft at apex, slightly 2-keeled, } line long.

Grain elliptical, compressed, brown, 4 line long.

PLATE XX; a, spikelet enlarged.

A tall coarse grass, growing in dense tufts, commonly called Saccaton or Zac-
ate. Probably too coarse to be of agricultural value.

Western Texas to southern California,

SN
SW INAS

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o
ca ~
=

BS

IROBOLUS

iv alte

td
~ Pea,

No. 21.
TRISETUM HALLII Scrib.

Plant annual.

Culms slender, not branching, geniculate, ascending, scabrous, 1 to 13 feet
tall. :

Leaves; radical, few and small; of culm 3 or 4; sheaths usually exceeding
internodes, open above, somewhat scabrous; blades flat or slightly involute, taper-
pointed, scabrous on both sides, 1 to 15 lines wide, 3 to 5 inches long; ligule mem-
branaceous, truncate, lacerate, 1 line long.

inflorescence a rather narrow, contracted, close, erect, or flexuous panicle, 4 to
6 inches long, included or but slightly exserted; branches mostly in threes, slightly
spreading, + to 1 inch long, bearing pedicellate’ spikelets; crowded along their
entire length.

Spikelets obovate, 3- to 4-flowered, upper one sterile, small and abortive, 2 to
23 lines long; first glume narrowly lanceolate, acute, herbaceous, hispid on keel,
3-nerved, 4 line wide, 2 lines long; second glume oblong-lanceolate, 5-nerved, twice
as wide asthe first; internode of rachilla slender, curved, articulate above, smooth,
3 line long; floral glume lanceolate, with two attenuate teeth at apex, scarious,
scabrid, 15 to 2 lines long, obscurely 3-nerved, mid-nerve excurrent in a slender
awn 2 to 4 lines long; palet narrowly linear, lanceolate when spread out, thin,
2-keeled, 1 line long, not inclosed in floral glume.

Grains, none found in the specimens examined

PLATE XXI; a, spikelet; b, empty glumes; ¢, floral glume; d, palet.
This differs from T. interruwptum Buckl. in its heavier panicle, shorter teeth of

the flowering glume, and the higher insertion of the awn, Both species occur in
Texas,

7 Holen, det.

No. 22.
TRISETUM INTERRUPTUM Buckley.

Plant slender, tufted, annual, rather glaucous throughout.

Roots numerous, fine.

Culms ascending, geniculate, branching, terete, smooth, 6 to 18 inches tall.

Leaves of radical shoots numerous, with smooth or cinerous-pubescent sheaths
and flat blades, hispid above, 2 to 3 inches long; of culm 3 to 5; sheaths usually
little shorter than internodes, smooth or somewhat scabrous or pubescent; blades
flat or involute, scabrous, 2 to 3 inches long; hgule membranaceous, lacerate,
obliquely truncate, 1 line long.

Inflorescence a narrow, somewhat interrupted, erect or flexuous panicle, 3 to
5 inches long; branches in 2’s or 3’s of unequal length, 4 to 1 inch long.

Spikelets sessile, obovate, 3- to 4-flowered, upper one sterile or small and abor-
tive, 2 to 24 lines long; first glume oblanceolate, acute, herbaceous, hispid on
keel, 3-nerved, 14 to 2 lines long; second glume same, but twice as wide and
5-nerved; internode of rachilla curved, glabrous, } line long; floral glume lanceo-
late, rounded on back, scarious above, rigid, smooth, about 2 lines long, 3-nerved,
ending in 2 slender teeth, 2 lateral nerves uniting above with the midnerve and
forming above the middle a slender hispid awn, 2 to 3 lines long; palet narrowly
linear, wider at top, lanceolate when spread out, thin, smooth, 2-keeled, cleft at
apex, standing out of floral glume, 1 line long.

Grain yellowish, opaque, elliptical, flattened, 1 line long.

PLATE XXII; a, floral glume, side view; b, palet; c, spikelet; d (marked a in
plate), empty glumes. The floral glume, a, is not well figured,

Abundant in Texas,

Wits Bien & Co Lith

SP DRIIDMrTtINs
INTERRUPTUN

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CHLORIS SWARTZIANA Déll. (Chloris petrea Swz. non. Thunb.)

(Schultesia petrea Spreng.) (? Eustachys petrea Desy.)

Plant perennial, from short rootstock, light green or more or less purplish
throughout.

Culm erect, or genticulate and spreading below, frequently branched, flatly
compressed, smooth, 1 to 2 feet tall.

Leaves; radical, with closely compressed, smooth, equitant, divergent sheaths,
and flat or folded blades, round-pointed, scabrous on the edge, 2 lines wide, + to
10 inches long; of stem 3 to 5, sometimes opposite; sheaths compressed, loose,
smooth, shorter than internodes; lower blades like those of radical leaves but
shorter, and upper ones reduced to nearly none; ligule a minute, ciliate, membrana-
ceous fringe.

Inflorescence a digitate cluster of 3 to 6 sessile, linear, erect, slightly spreading
spikes, 2 to 3 inches long, bearing the crowded sessile spikelets in two rows on one
side of the slender, scabrid rachis.

Spikelets 2-flowered, upper flower sterile; first glume broadly ovate-acute,
smooth, l-nerved, scarious, + line long; second glume obovate, 2 minutely toothed
lobes at apex and a short hispid awn formed by the excurrent nerve, hispid on back,
# to 1 line long; floral glume, rotund, broadly acute, or rounded and mucronate,
coriaceous, brown, ciliate, pubescent on the lower two-thirds of the single nerve,
smooth above; palet ovate-lanceolate, convex, obscurely 2-nerved, 1 line long; ster-
ile flower a broadly ovate, truncate glume, folded triangular, brown, $ line long.

Grain translucent, creamy-white, triangular, 3 line long, falling with spikelet
intact except the empty glumes which are left on the rachis.

PLATE XXIII; a, spikelet; b, floral glume, sterile flower, stamens and stigmas;
c, second empty glume; d, first empty glume; palet not shown.

Low grounds near the Gulf, from Florida westward to Texas.

ODES

7

SWART ZIANA , Doll

L

CHLORIS

INon24:
TRICHLORIS PLURFLORA Fourn.

Plant rather coarse, somewhat glaucous throughout or purplish in the inflor-
escence.

Culms few, from loosely tufted, slightly bulbous base, erect, solid, terete,
smooth, rarely branching, 2 to 3 feet tall.

Leaves; radical and from sterile culms, numerous, with loose sheaths, and flat,
taper-pointed blades, 3 to 4 lines wide and 8 to 10 inches long, scabrous above and
below, with scattered hairs near the ligule; of stem 5 to 7; sheath equaling or
exceeding internode, loose and open above, smooth; blade like that of the radical
leaves; igule a row of rusty, fine hairs 4 line long.

Inflorescence an obovate panicle of 10 to 15 slightly spreading, narrow, sessile
approximate spikes, scattered one or two in a place along the short rachis. Spikes
unilateral, rachis hispid, 2 to 4 inches long.

Spikelets nearly sessile, with 3 or 4 flowers, the upper ones sterile; first glume
narrowly-lanceolate, terminating in an awn-like point, hyaline, about 1 line long;
second glume larger, 13 to 2 lines long; floral glumes narrowly-lanceolate, scabrous,
ciliate on the margins, 1-nerved, 2 lines long, terminating in 3 hispid awns, middle
one 4 lines and lateral ones about 1 line long; palet lanceolate, acute, 2-nerved,
hyaline margins infolded; upper sterile glumes same as floral glumes but smaller
and lateral awns sometimes minute.

Grain yellow, narrowly triangular, $ line long.

PLATE XXIV; a, spikelet; b, floral glume; c, palet; d, empty glumes.

Texas to Mexico,

del

a

T Hole a

Four

fe

fj

an

TRICHLORIS PLURIFLO

.
s
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i i
i uy i

No. 25.

TRICHLORIS VERTICILLATA Fourn. (Chloropsis Blanchardiana
Gay in Herb.)

Plant perennial, mostly glaucous, or light-green, or purplish in the inflorescence.

Culms tufted from somewhat bulbous base, erect or sometimes prostrate below
and rooting at the lower nodes, terete, solid, smooth, 1 to 23 feet tall.

Leaves, radical and from sterile culms, with compressed. hairy-fringed sheaths
and hispid, flat or somewhat revolute, slender-pointed blades 3 to 8 inches long; of
stem usually 4; lower sheaths equaling nodes, upper ones often much shorter,
striate, hispid, hairy along the margins, blade flat or V-shaped with revolute mar-
gins, hispid above and below and with scattered white hairs above the ligule, which
is a dense row of fine white hairs } line long..

Inflorescence an umbellate cluster of 8 to 12 or more narrow, sessile, shghtly
spreading spikes, 3 to 4 inches long, with the spikelets narrowly-sessile in two
rows on one side of the hispid rachis.

Spikelets lance-linear, with one fertile and one sterile flower; first glume linear-
lanceolate, acute or short awned, hyaline, 1-nerved, } to $ line long; second glume
ovate, ? line long, with an awn of equal length; third or floral glume narrowly
lanceolate, scabrous on back, obscurely 3-nerved, 14 lines long, terminating in 3
scabrous awns 5 to 9 lines long; palet lance-linear, ciliate at the rounded apex,
hyaline, 2-nerved, 14 lines long; fourth (sterile) glume, cylindrical, filiform, 1 line
long, terminating in 3 hispid awns 3 to 6 lines long.

Grain lance-elliptic, triangular in cross section, translucent, light yellow, with
light orange chit. falling with the spikelet, entire except the persistent empty
glumes.

PLATE XXV; a, and b, spikelets enlarged.

Texas, Arizona to Mexico.

KAV

gl eo lO

7 TA Fourn ;

No. 26.
SCHEDONNARDUS TEXANUS Steud. (Lepturus paniculatus Nutt.)

Plant a low straggling annual.

Culm tufted and branching at base, spreading, slender, terete, or compressed,
hollow, minutely pubesceut.

Leaves; radical and from radical shoots. numerous, folded, spirally twisted,
with short, cartilaginous points; of culm 1 or 2 equaled or exceeded by those of
the base; sheaths loose, compressed, open above; blades flat or folded, spirally
twisted, smooth, 2 to 3 inches long; ligule ovate, acute, lacerate, decurrent in sca-
rious margins down the sheath:

Inflorescence a loose racemose panicle, the spikelets sessile and appressed in
excavations in the horizontally spreading branches, which are 1 to 4 inches long,
alternate and distant on the triangular hispid rachis.

Spikelets 1-flowered, narrow, 13 to 2 lines long; first glume lanceolate, some-
times toothed on the margin, scarious-margined, # line long, sometimes 1 sided, 1
prominent hispid nerve, sometimes excurrent in an awn one-half as long as the glume;
second glume same but nearly twice as large; floral glume narrowly lanceolate,
acute or mucronulate, 3-nerved, rounded on back, hispid on the midnerve, slightly
pubescent at base, 13 lines long; palet ovate, obtuse, or slightly toothed, round on
back, hyaline, 2-nerved, 14 to: 14 lines long.

Grain dark reddish, translucent-amber, with darker oblique chit extending
one-third way from base, narrowly cylindrical, 1 line long, falling free or with
disarticulate branch.

PLATE XXVI; a, branch with spikelets in position; 6, spikelet; c, second
empty glume; d, first empty glume; e, palet; f, floral glume.

Texas to Arizona, northward to Dakota and British America.

PLATE XXVI

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Non 217
PAPE OPHO RUM: Ava rE RaW ivi Munro, in Herb.

Plant perennial, loosely tufted with somewhat bulbous base.

Culms erect, not branched, solid, terete, smooth, 18 to 30 inches tall.

Leaves; radical few and small; from radical shoots, with slightly hispid
sheaths, and narrow, involute blades, 4 to 10 inches long; of culm 3 or 4; sheaths
nearly equaling or often exceeding internodes, slightly hispid; blade involute, his-
pid above, 2 lines wide with long tapering point, 6 to 10 inches long; ligule a rather
conspicuous, loose hairy fringe 1% to 2 lines long.

Inflorescence a close, linear, spike-like, panicle, 6 to 10 inches long, with short
branches below, none above, often included at base.

Spikelets oblong, 3-flowered (upper one sterile), 2 lines long, on short hispid
pedicels less than $ line long; first glume lanceolate acute, carinate, hyaline, mi-
nutely hispid-on keel, 1-nerved, 14 lines long; second glume same but 4 line longer;
floral glumes vasiform, nearly square unrolled, pubescent especially below, 1 line
long, 7-nerved, each nerve terminating in a hispid awn 2 lines long, and alternat-
ing with these are 7 or 8 slightly smaller awns; sterile glume similar but half as
large and raised on an internode of the rachilla 4 line long; palet lanceolate, lacer-
ate at apex, 2-keeled, 13 lines long.

_ Grain narrowly lanceolate, light brown, 1 line long, falling with the entire
spikelet, except the persistent empty glumes.

PLATE XXVIII; a, spikelet; b, empty glumes; ¢, floral glume; d, palet; e, ster-
ile upper flower

There is a variety of this species with much looser inflorescence, the lower
branches 1 to 2 inches long, flowering mostly to the base and subdivided; spikelets
purplish.

Western Texas to Arizona,

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No. 28.
PAPPOPHORUM WR IGHTII Watson. (P. boreale Torr. non Griseb.)

Plant perennial (?) from densely tufted, bulbous base.

Roots fibrous, flexuous.

Culms erect or ascending, geniculate at the lower nodes, branching, slender,
solid, terete, minutely pubescent with long white hairs at the nodes, 10 to 15 inches
tall.

Leaves of radical shoots numerous, minutely pubescent, blade filiform-involute,
~2 to 4 inches long; of culm 4 to 6; sheaths shorter than the internodes, loose, open;
- blade filiform-involute, 1 to 3 inches long; ligule a dense line of hairs 4 inch long.

Inflorescence a compact, spike-like panicle, 1 to 3 inches long, simple, or with
numerous short appressed branches below.

Spikelets on short hispid pedicels, about 3-flowered, 1 line long; empty glumes
lanceolate, acutish, 5-nerved; hyaline, sparsely pubescent, # line long; second
glume same but + longer; floral glumes broadly oval, pubescent, 1 line long and
nearly as broad; 5 nerves terminating in feathered awns 1} lines long, purple at
base, 4 similar intermediate awns alternating; sterile glume similar but smaller
and raised on a longer internode of the rachilla; palet elliptical, hyaline, 2-keeled,
nerves rather inconspicuous, $ line long.

Grain about oval, dull-yeliow, falling with the floret.

PLATE XX VIII; a, spikelet dissected; b, sterile flowers; c, floral glume; d, palet,

Texas to California and Mexico,

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No. 29.
COTTEA PAPPOPHOROIDES Kunth.

Plant perennial from a short, scaly rootstock, light green or often purplish in
the infloresence and lower sheaths.

Culms loosely tufted at base, erect or somewhat spreading, branching, hollow,
terete, pubescent, 1 to 2 feet tall.

Leaves; radical and from radical shoots few and small; of culm 7 to 10, sheaths
close, minutely cinerous pubescent, nearly equaling or usually exceeding the inter-
nodes; blade flat or involute toward the tapering point, somewhat scabrous on
both sides, 14 to 2 lines wide, 3 to 6 inches long; ligule a minute hairy fringe.

Inflorescence a rather close, or becoming loose, lanceolate or narrowly pyra-
midal panicle, 3 to 6 inches long, peduncle but little exserted, rachis pubescent,
nearly terete; branches mostly alternate, flower-bearing nearly to the base, slightly
spreading, 1 to 2 inches long, bearing the spikelets on short pubescent pedicels.

Spikelets obovate, flat, 7- to 10-flowered, 3 to 4 lines long; empty glumes oblong
or oblong-ovate, nearly equal, 2 lines long; first glume irregularly 3-toothed at
apex, about 13-nerved, pubescent on back, margins hyaline; second glume acutish
or short awned, about 9-nerved, with hyaline margins, less pubescent than first
glume; floral glumes obovate, 1 to 14 lines long, pubescent especially at base, about
15-nerved, cleft above into 11 narrow divisions, the outer more deeply cleft, and
ciliate on the margins, with long white hairs, each terminating in a hispid awn 4 to
14 lines long; palet lanceolate, with 2 pubescent nerves continuing and connivent
about the cleft apex, narrow hyaline margins infolded, 14 lines long.

Grain, dull whitish yellow, oblong, slightly curved, falling with the disartic-
ulated spikelet or easily escaping free.

PLATE XXIX; a, spikelet; b, empty glumes; c, floral glumes; c', part of apex
of floral glume enlarged; d, palet; d', apex of palet. The figure b does not show
the full number of nerves.

Texas to Arizona and Mexico,

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No. 30.
SCLEROPOGON KARWINSKIANUS Benth. (Lesowrdia Fourn.)

Plant perennial, from horizontal rootstock, culms of the season often rising
from branches thickly covered with pubescent scales which are the bases of the
leaf sheaths of previous seasons; new growth, rather glaucous throughout.

Culm ascending. slender, terete, smooth, branching below, 6 to 12 inches tall.

Leaves of sterile culms, and radical, numerous, with flat blades 1 to 2 inches
long; of culm 2or3; sheaths usually much shorter than internodes, close, smooth,
blade flat or folded, hispid on the back of the midnerve toward the rigid point, 1
line wide, 1 to 2 inches long; ligule a dense row of minute stiff bristles, $line long.

Inflorescence unisexual, flowers on distinct culms. Male flowers forming a short,
close panicle of 5 to 8 spikelets on short pedicels, often subtended by a narrow
bract on the rachis. Spikelets 15- to 30-flowered, 2 to 3 lines wide, $ to 14 inches
long, rachilla glabrous, internodes 4 line long; first and second glumes equal, nar-
rowly lanceolate, acute, carinate, scarious, smooth, 1-nerved, 2 lines long; floral
glumes lance-ovate, acute or often with short awn and 2 or 4 teeth at apex, scari-
ous, 3-nerved, smooth, 25 to 3% lines long; palet oblong, flat, with margins
infolded, scabrous on the two nerves.

Female flowers forming an irregular narrow panicle of 3 to 7 few-flowered
spikelets, each subtended by a narrow bract; first glume narrowly lanceolate, with
long, tapering point, smooth, obscurely 5-nerved, 4 to 6 lines long; second glume
lanceolate, smooth, 3-nerved, 6 to 8 lines long; internodes of rachilla 1 line long,
stipe bristly pubescent; floral glume linear, 4 to 5 lines long, the 3 nerves termi-
nating in slender twisted awns, 2 to 5 inches long, with membranaceous expan-
sions at the sides between each awn; palet lanceolate, acute or somewhat lacerate
at the apex, hispid on the 2 nerves above, scarious margins folding closely over the
grain, 4 to 5 lines long.

Grain light amber color, cylindrical, bifid at top, 2 lines long.

PLATE XXX; 1, staminate plant; 2, pistillate plant; a, staminate flower; b,
pistillate spikelets partly dissected and the awns cut off; c, floral glume of pistil-
late flower spread out, dorsal view.

Western Texas and Arizona to Mexico,

WER Schol, det.

SCLEROROGON KARWINSKIANA Aenth.

Me. Medes
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INO; Bil;
MUNROA SQUARROSA Torr. (Crypsis squarrosa Nutt.)

Plant annual, low, glaucous, more or less wooly throughout or glabrous except
at the nodes.

Root slender, filiform. :

Culms tufted, spreading, often prostrate, fasciculately branched, primary stems
2 to 4 inches long, secondary shorter, naked internodes striate, angular, and hispid
on the angles.

Leaves ; radical and from sterile culms numerous, with flat blades $ to 1 inch
long ; of stem several, crowded with the spikelets atthe nodes, or endsof branches ;
sheaths short, membranaceous, 7-nerved, ciliate ; blade flat, hispid, ciliate, acute,
4+ to 1 inch long; hgule a row of short, fine hairs.

Inflorescences hidden in the tufts of leaves at the nodes and ends of branches.

Spikelets 3- to 5-flowered, crowded in dense clusters at the apex of the branches ;
first glume narrowly lanceolate, hyaline, I-nerved, 14 lines long; second glume
same but ¢ line longer ; floral glumes herbaceous, becoming coriaceous, 3-nerved,
tufts of pubescence on'lateral nerves and near base of keel, entire or 2-toothed,
2 to 24 lines long, the central nerve excurrent ina short awn; palet narrow, hyaline,
pubescent on the two nerves complicate ; upper flower in spikelets usually sterile,

Grain translucent, cream-white, lance-oval, $ to 4 line long. |

PLATE XXXT; 1, cluster of spikelets; 2, spikelet; 3, second empty glume;
4, first empty glume; 5, floral glume, side view, and 6, same spread out, dorsal
view; 7, palet; 8, pistil; 9, mature grain.

A low, tufted grass growing on elevated plains from Mexico to British America,
usually associated with Buchloé dactyloides, but not liked by cattle.

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TRIODIA ACUMINATA (Munro.) Vasey. (Tricuspis acuminata Munro in
Herb.)

Plant annual or short-lived perennial, tufted with rather bulbous base.

Culms erect, slender, not branching, slightly compressed, smooth or sparsely
pubescent, 6 to 12 inches tall.

Leaves ; radical, numerous, with short, tapering, compressed sheaths, and
flat or folded, abruptly pointed, pubescent blades, 2 to 3 inches long; of culms 2
or 3; sheaths mostly shorter than internodes, close, nearly smooth; blades like
those of radical leaves but shorter; ligule a minute, bristle-hke fringe.

Ipflorescence a contracted, close head or panicle, 1 to 2 inches long, ight colored
or often purplish, composed of 7 to 15 nearly sessile, densely flowered spikelets
or branches, $ to ¢ inch long, sometimes interrupted below.

Spikelets lanceolate, compressed, 9- to 12-flowered, 2 to 3 lines wide, 5 to 7 lines
long; internode of pubescent rachilla less than 4 line long; first glume ovate,
acuminate, or awl-pointed, carinate, scarious, smooth, 1-nerved, 2 to 24 lines long;
second glume same but nearly 4 line longer; floral glumes ovate, acuminate,
slightly obtuse or somewhat 2-toothed at apex, carinate, membranceous, pubescent
on the 3 nerves at base, 2 to 23 lines long, 2 lateral nerves marginal, midnerve ex-
current in a short slender awn ; palet lanceolate, finely pubescent on the two prom-
inent keels and at base, 1 to 14 lines long.

Grain irregularly spindle shaped, light-green, $ line long.

PLaTE XXXII; a, spikelet ; 6, empty glumes; ¢, floral glume; d, palet.

Texas to Arizona, and Mexico.

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No. 33.
TRIODIA ALBESCENS (Munro.). (Tricuspis albescens Munro in Herb.)

Plant perennial, with shghtly thickened base, smooth and often glaucous
throughout.

Roots coarse.

Culms loosely tufted, erect, solid, terete, not branching, 15 to 30 inches tall.

Leaves; radical, sheaths short and open; blades flat or folded, involute, slen-
der-pointed, 2 to 3 lines wide, 5 to 12 inches long; of culm 2 to 4, sheaths shorter
than internodes, open above; blades like those of radical leaves; ligule a dense line
of short, fine hairs.

Inflorescence a slender, contracted, close panicle, somewhat interrupted below,
erect or slightly nodding, $ inch wide, 4 to 8 inches long; branches appressed, un-
equal, 3 to 15 inches long, bearing along their entire length rather crowded short-
pedicelled spikelets.

Spikelets oval, compressed, 8- to 12-flowered, 23 to 3 lines long and 3 as wide;
first and second glumes nearly equal, second, slightly larger, broadly ovate,
acute, carinate, hyaline, smooth. 1-nerved, 14 lines long; internodes of rachis
curved, 4 line long or less; floral glume broadly-elliptical, 3-nerved, emarginate or
nearly entire, hyaline, smooth, or nearly so, midnerve slightly if at all excurrent,
lateral nerves not marginal; palet broadly ovate, obtuse, 2-keeled with the mar-
gins folded flat, 14 lines long.

Grain elliptical, yellow, + line long.

PuLatE XXXII; a, spikelets; b, empty glumes; c, floral glumes; d, palet.

Texas and New Mexico.

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\TRIODIA ALBES(

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No. 34.
TRIODIA ERAGROSTOIDES Vasey & Scrib.

Plant annual or short-lived perennial, with slightly thickened base.

Culms erect, branching, solid, terete, smooth, 2 to 3 feet tall.

Leaves; radical, few; of culm 5 to 9, sheaths usually exceeding the internodes,
rather loose and open above, striate and slightly scabrous, blades flat or involute
toward the long tapering point, scabrous on both sides. 2 to 3 lines wide, 6 to 10
inches long; ligule membranaceous, truncate, lacerate, tawny, 1 line long.

Inflorescence a loose, spreading, lance-ovate, or pyramidal, erect or drooping
panicle 8 to 12 inches long; rachis angular, hispid near top, branches mostly
alternate, slender, scabrous only toward the extremities, sometimes reflexed at
maturity, 3 to 6 inches long, bearing the nearly solitary spikelets on slender, scab-
rous pedicels 1 to 3 lines long.

Spikelets oblong-ovate, compressed, 7- to 9-flowered, 2 to 3 lines long; first
glume linear-lanceolate, acute or acuminate, 1-nerved. 1 line long; second glume
ovate-lanceolate, acuminate and longer; internodes of slender glabrous rachilla
articulating above, 4 line long; floral glumes oblong, truncate or slightly 2-lobed,
mucronate, rounded on back, membranaceous, often purplish, pubescent near the
base on the 3 nerves, lateral nerves near the margins, 1 line long; palet lance-
oblong, truncate, minutely ciliate, membranazeous, smooth, 2-keeled, scarcely 1
line long.

Grain oblong, angular, 2-horned at apex, opaque, brown, falling with spike-
let, usually disarticulate above empty glumes.

PLATE XXXIV; 0, spikelet enlarged.

Florida, Texas to Mexico. <A large leafy grass which promises to be servicea-
ble in agriculture.

Es

PLATE XXXIV.

L.R. Stowell det

No. 35.
TRIODIA GRANDIFLORA Vasey.

Plant perennial, with tufted bulbous base, rather glaucous or minutely cinerous-
pubescent throughout.

Culms slender, erect, not branching, often geniculate at the hairy nodes, terete,
sparingly pubescent, 1 to 2 feet tall.

Leaves; radical, numerous with compressed, equitant, hairy-fringed sheaths
and flat or folded, white-margined, pubescent, obtuse or abruptly pointed blades,
2 to 4 inches long; of culm 3, rarely 2 or 4; sheaths half as long as internode,
close, slightly pubescent or nearly glabrous; blades like those of radical leaves but
upper ones shorter and erect.

Inflorescence a close, contracted, head-like white panicle, composed of numer-
ous, nearly sessile branches, 1 to 2 inches long; rachis and branches somewhat
pubescent, or scabrous.

Spikelets nearly sessile, oblanceolate, compressed, 4- to 6-flowered, 2 lines wide,
4 to 5 lines long; first glume lance-ovate, acute, carinate, membranaceous, minutely
scabrous on keel, 1-nerved or sometimes 3-nerved on lower spikelets, 2 to 3 lines
long; second glume same, but ciliate at base, always 1-nerved, and 1] line longer;
floral glume lance-ovate, obtuse and minutely ciliate, or with 2 narrow lobes at
apex, pubescent below, profusely ciliate, 3-nerved, 2 to 3 lines long; hispid mid-
nerve excurrent in an awn $ to 1 line long; palet broadly lanceolate, pubescent at
the base and on the 2 prominent kcels, 1 to 13 lines long,

Grain not present in the specimens examined,

PLATE XXXV; a and J, floral glumes showing the extremes of variation at
the apices; ¢, palet.

This species has been called 7. avenacea H. B. K., from which it differs in its
much larger size, and in its flowers, as is shown by a comparison of the figure in
lel, 1B, 1, :

Western Texas to Arizona and Mexico.

ATE XXXV

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No. 36.
TRIODIA NEALLEYI Vasey.

Plant perennial, tufted, with a bulbous base.

Culms erect, slender, not branched, terete, smooth, 1 to 2 feet high, nodes ciliate.

Leaves; radical with pubescent, fringed, scarious-margined sheaths, tapering
into narrow, folded, nearly smooth blades 2 to 6 inches long; of culm 3 or 4, sheaths
close, smooth, lower ones equaling or exceeding internodes, upper much shorter;
blades flat or folded, nearly smooth, 1 to 3 inches long; ligule a narrow, callous
line with a loose fringe of hairs.

Inflorescence a dense spike-like panicle, white, 1 to 24 inches long, the branches
4+ to 1 inch long, alternate, closely appressed.

Spikelets broadly oblanceolate, compressed, 13 to 2% lines wide, 25 to 3 lines,
long, 4- to 7-flowered; first glume ovate, acute, carinate, translucent, smooth, about
2 lines long; second glume same, but 3 line longer; floral glumes oblong, truncate,
translucent, profusely ciliate on the margins and pubescent on the back below,
2-lobed or cleft one-third way to base, the two minutely ciliate lobes equaled or
exceeded by the intermediate awn, 3-nerved, lateral nerves marginal; palet lance-
olate, strongly arched, thin, pubescent on the two prominent keels.

Grain pale translucent-green, shaped like the quarter of a sphere with brown-
ish opaque projection extending along the axis, ? line long.

PLATE XXXVI; a, spikelet; b, empty glumes; c, floral glume, dorsal and side
view; d, palet.

Thus far collected only in Texas, by G. C. Nealley, for whom it is named,

PLATE XXXVI.

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No. 37.
TRIODIA PULCHELLA H.B.K. (Uralepis pulchella Kth.)

Plant a low, tufted perennial, with bulbous base, arising froma slender creep-
ing rootstock.

Culms spreading, fasciculately branched, at the extremity of long, naked inter-
nodes. .

Leaves; radical and of culm alike, numerous, clustered at the base, and around
the fascicles of branches leaving the internodes naked; sheaths short, open, taper-
ing, scarious; blades narrow, folded and involute; ligule a minute fringe, decurrent
down the membranaceous margin of the sheath.

Inflorescence, small clusters of light-colored spikelets terminating the short
clustered branches.

Spikelets lanceolate, compressed, 7- to 10-flowered, 2 lines wide, 3 to 4 lines long;
internode of rachilla articulate below, ¢ line long; first glume lance-ovate, acumi-
nate, carinate, hyaline, smooth, 1-nerved, 2 to 25 lines long; second glume same
but $ line longer; floral glume oblong, 2 lines long, cleft above half way to base or
more, making 2 long narrow margined lobes, between which the midrib is extended
as an awn longer than the lobes, 2 lateral nerves nearly marginal, profusely ciliate,
pubescent below; palet oblong, truncate, thin, pubescent below, and on the 2 keels.

Grain pear shaped, translucent, ight yellowish color, with opaque, brownish
base 3 line long.

PLATE XX XVII; 1, young plant; 2, plant in flower; 3, at maturity ; a, spikelet;
b, empty glumes; c, floral glume, dorsal and side views; d, palet.

Texas to California and Mexico.

PLATE XXXVII

L, aLe.

T Holz

TRIODIA PULCHELLA, FB.

No. 38.

TRIODIA STRICTA (Nutt.) Vasey. (Tricuspis stricta Thurb. Wiandsoria
stricta Nutt.)

Plant coarse, apparently perennial, glabrous throughout except near the
ligule.

Culms erect, few in a place, tufted, with sterile culms at base, not branched,
terete, thick, 2 to 3 feet tall. :

Leaves; radical and from radical shoots numerous, the long tapering sheaths
continuing with but slight constriction at the ligule, into the flat or involute smooth
blade, 2 lines wide, 8 to 12 inches long; of culm 4 or 5, sheaths usually exceeding
the internodes, open above, blade like those of radical leaves, hgule an inconspic-
uous, tawny fringe.

Inflorescence a constricted, dense, erect, spike-like panicle, 4 to 12 inches long,
branches sessile, alternate, appressed, 4 to 1 inch long.

Spikelets nearly sessile, obovate, compressed, 5- to 8-flowered, 14 to 2 lines
wide, 2 to 24 lines long; first and second glumes equal, narrowly lanceolate, longer
than the spikelet, acute, or irregularly toothed at apex, carinate, membranaceous,
smooth, 1-nerved, 2 to 3 lines long; floral glumes oblong, toothed at apex, obtuse,
membranaceous, 3-nerved, lateral nerves nearly marginal, middle one shghtly
excurrent, all pubescent below, 1 to 14 lines long; palet elliptical, obtuse, arched,
thin, the 2 keels minutely velvety pubescent.

Grain obovate, 2-horned at summit, opaque, yellow, $ line long.

PLATE XXXVIII; a, spikelet; b, empty glumes; c, floral glume dorsal and
side views; d, palet, dorsal and ventral views.

Louisiana to Texas and Indian Territory.

LATE XXXVI.

ie

:
;

_ TRIODIA STRICTA

, Vasey. =

No. 39.
TRIODIA TEXANA Watson.

Plant perennial, with somewhat bulbous, tufted base.

Culms erect, simple or sparingly branched, slightly geniculate, terete, slightly
pubescent, 15 to 2 feet tall.

Leaves; radical numerous, with short, smooth sheaths and involute blades 3
to 6 inches long; of culm 3 or 4; sheaths usually exceeding internodes, close, nearly
smooth; blades flat or becoming involute, siender, pointed, smooth or slightly
pubescent, 2 or 3 lines wide, 6 to 10 inches long; ligule a minute fringe with longer
hairs at the sides.

Inflorescence a loose, nodding or flexuous panicle, 3 to 5 inches long; branches
mostly alternate and spreading, slender, smooth, 1 to 2 inches long, divided and
bearing beyond the middle 3 to 5 or more pedicellate spikelets.

Spikelets large, oblong, somewhat compressed, purplish, 6- to 9-flowered, 3 to 5
lines long; first glume ovate-lanceolate, acute or irregularly toothed, carinate, hya-
line, smooth, 1-nerved, 1 to 1 13 lines long; second glume same but line longer;
internode of rachilla curved, glabrous, articulateabove, 4 linelong; floral glumes
nearly orbicular, slightly lacerate above, membranaceous, pubescent toward the
base of the 3 nerves, 2 lateral nerves not marginal, about 2 lines long; palet broad
at base, narrowed above, obtuse, 2 keeled, smooth, 1# lines long.

PLATE XX XIX; a, spikelet; b, empty glumes; c, floral glume; d, palet, ven-
tral view.

Louisiana to Texas, New Mexico and Mexico.

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No. 40.

TRIODIA: TRINERVIGLUMIS (Munro) (Tricuspis trinervighumis Munro
in Herb.)

Plant perennial, with slightly thickened tufted base.

Culms erect or geniculate below, rarely branching, terete, hispid, 2 to 3 feet tall.

Leaves; radical and of radical shoots numerous, with loose, pubescent sheaths
and involute, hispid, often pubescent blades, 3 to 6 inches long; of culm 4 to 6;
sheaths longer than internodes, open above, upper ones nearly smooth; blades like
those of radical leaves; ligule an inconspicuous fringe.

Inflorescence a narrow, erect, spike-like panicle, 4 to 8 inches long; branches
erect, simple, almost appressed, $ to 2 inches long, or often reduced to single
spikelets a little distant, or interrupted. }

Spikelets oblong or oblanceolate, but little compressed, 7- to 9-flowered, 3 to 5
lines long; first glume lanceolate, obtuse or nearly acute, carinate, scarious, 7-
nerved, 2 to 3 lines long; second glume lance-ovate, acute, carinate, scarious, sca-
brid, hispid on keel, 3-nerved, 24 to 34 lines long; internode of rachilla stout,
pubescent, articulate above, + line long; floral glumes oblong-ovate, obtuse, emar-
ginate, mucronate or entire at apex, 3-nerved, pubescent below, lateral nerves
vanishing before reaching the margin, palet ovate, obtuse, pubescent on the 2 keels,
13 lines long.

Grain ovate-conical, deeply hollow on one side, dark-brown, punctate, 14 lines
long.

PLATE XL; a, spikelet; b, and b’, empty glumes; c, floral glume dorsal and
side views; d, and e, palet, ventral and side views.

Prevails throughout Texas, westward to Arizona, and northward to Colorado.
Apparently not of great agriculturalimportance. Tricuspis mutica Torr. appears
to be a smaller form, with shorter, interrupted panicle.

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No. 41. ;
DIPLACHNE FASCICULARIS P. B. (Leptochloa fascicularis Gray.)

Plant annual, glaucous or light green, more or less purplish on the sheaths
and inflorescence.

Roots numerous, coarse.

Culms few, loosely tufted at base, erect or decumbent, branching, striate,
smooth, 2 to 3 feet tall.

Leaves; radical and from sterile culms with thin, smooth, striate, equitant
sheaths and slender involute, slightly hispid blades, 1 line wide unrolled, 6 to 12
inches long; of stems 3 or 4; sheaths usually exceeding internodes, smooth; blade
like that of radical leaves, upper one exceeding panicle and sheathing its base ;
ligule membranaceous, triangular, ovate, acute, entire, wider than blade, 13 to 2
lines long.

Inflorescence a loose, narrow, spreading panicle, included at base in upper
sheath, 6 to 8 inches long; of many linear, spike-like spreading branches, hispid,
mostly alternate, 2 to 4inches long, bearing 8 to 15 nearly sessile, appressed spike-
lets; general rachis angular, hispid.

Spikelets linear-oblong, or lanceolate at maturity, flattened, 6- to 9-flowered, 33
to 4 lines long ; internodes of articulate rachilla, $ line long; first glume varying
from ovate-lanceolate to linear, barely acute. or acuminate, hispid on back,
1-nerved, 1 to 13 lines long; second glume lanceolate to oblong, longer and often
somewhat 3-toothed or lacerate at the apex; floral glumes linear-oblong. acute,
ciliate on the lower third of the nerve, and pubescent at the base, 14 to 2 lines long,
3-nerved, 2 lateral nerves marginal, ending in rather inconspicuous teeth, mid-
nerve excurrent in a hispid awn nearly } tine long; palet linear, with two prom-
inent pubescent nerves, narrow, hyaline, infolded margins, and truncate or slightly
rounded, minutely ciliate apex.

Grain surrounded with rather loose, hyaline pericarp; salmon pink with small
garnet scar at base, flat, lanceolate, 1 line long; readily shelling out of flower as
the spikelet falls.

PLATE XLI; a, spikelet; 6, empty glumes; c, floral glume, dorsal and side
view ; d, palet.

This species presents considerable variation in the spikelets, forming probably
several varieties.

It is extensively distributed over the country, both north and south, but be-
comes abundant in Texas and westward, also in Mexico:

No. 42.
DIPLACHNE IMBRICATA (Thurb.)Scrib. (Leptochloa imbricata Thurb. )

Plant annual or short-lived perennial from bulbous base, somewhat glaucous,
purplish on the sheaths and with dark green panicle.

Culms tufted, erect, geniculate, branching, hollow, terete, smooth or minutely
scabrid near base of panicle, 1 to 2 feet tall. ;

Leaves; radical and of radical shoots, numerous, with smooth, tapering, com-
pressed sheaths and narrow, slender pointed, folded or involute, hispid blades, 4
to 8 inches long; of culm 3 or 4; sheaths striate, sightly roughened on upper part,
open above, nearly equaling internode; blade like that of radical leaves but usu-
ally shorter; ligule membranaceous, ovate, acute, entire, wider than the blade,
decurrent.

Inflorescence a rather close, narrowly-oblong panicle, 4 to 6 inches long, of
numerous linear branches; rachis angular, hispid ; branches hispid, s'ender,
mostly alternate, slightly spreading, 13 to 2 inches long, bearing on the lower side
12 to 16 nearly sessile, appressed, and imbricate spikelets.

Spikelets linear-oblong, 7-to 10-flowered, 23 to 3 lines long less than 1 line
wide; internodes of glabrous rachilla articulate, 4 line long ; first glume ovate,
acute, carinate, ciliate, hispid on back, 1-nerved, 3 line long; second glume ellip-
tic-oblgng, obtuse, often slightly mucronulate, 1 to 14 lines long; floral glume
oblong, truncate, with two short blunt teeth at the summit, the mid-nerve termin-:
ating in a short mucro, membranaceous, pubescent on the lower half of the lateral
nerves, 1 line long; palet lance-oblong, with rounded ciliate apex, two prominent
pubescent nerves and narrow infolded hyaline margin, 1 line long.

Grain light-brown, obovate, falling with flower but easily separated.

PLATE XLII; a, spikelet; b, empty glumes; c, floral glumes, dorsal and side
view ; d, palet.

Texas, New Mexico, Arizona, and southern California.

Te, hey

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TE IMBRICATA, TAwr

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DIPLAC

No. 43.
DIPLACHNE REVERCHONI Vasey.

Plant a low tufted annual.

Culms erect, slender, not branched, 3 to 10 inches long.

Leaves at base, numerous, involute, setose, smooth, 1 to 24 inches long; of
culms 1 or 2 above base, mostly exceeded by radical leaves; sheaths striate, close,
smooth; blade filiform, involute; ligule a minute, hairy fringe.

Inflorescence a spike-like panicle, 1; to 3 inches long; the nearly sessile, ap-
pressed spikelets alternate along the striate slender rachis.

Spikelets lance-linear, 6- to 10-flowered, 3 to 4 lines long; internode of rachilla
glabrous; first glume ovate, acute, carinate, membranaceous, 1-nerved, smooth, 1
line long; second glume oblong, obtuse or obscurely toothed 4 line longer; floral
glumes 14 lines long, ovate-lanceolate, membranaceous, 2 teeth at apex, 2 lateral
nerves slightly pubescent at base, vanishing before reaching the margin, mid-nerve
excurrent into a minute hispid awn +4 line long; palet linear-lanceolate, 2-keeled,
cleft at apex, minutely ciliate, } line long.

Gram light amber color, narrowly conical, falling with flower but easily sepa-
rated.

PuaTE XLIII; a, spikelet; b, empty glumes; c, floral glumes, dorsal and side
views; d, palet.

Texas to Mexico. First collected by J. Reverchon, Texas. It has been re-
ferred to D. sumplex Doell, from which I think it differs.

PLATE XLII

LT Hcbr., ae.

No. 44.

DIPLACHNE RIGIDA (Munro) Vasey. (Leptochloa rigida Munro, MSS.)

Plant perennial, from loosely tufted, bulbous base.
Culms erect, terete, smooth, not branching, 1 to 2 feet tall.

Leaves; radical and from radical shoots comparatively few, with short, loose,

involute, tapering sheaths, and narrow, mostly filiform, involute, rigid, pointed
blades, 2 to 6 inches long, pubescent, with few scattered hairs; of stem 2 or 3;
sheaths longer than internodes, close, smooth, with blades like those of radical
leaves’; ligule a prominent tuft of spreading hairs 1 line long.

Inflorescence a loose, spreading panicle 6 to 12 inches long; rachis triangular,
smooth; branches distant, alternate, spreading or horizontal, triangular, hispid on
the angles, with tuft of hairs at the axis, 3 to 6 inches long, bearing 5 to 8 distant,
sessile, appressed spikelets.

Spikelets oblanceolate, 5- to 9-flowered, 35 to 43 lines long; first glume lanceo-
late, acute, carinate, rigid, 1-nerved, hispid on keel, 13 lines long; second glume
lanceolate, acute, convex, 5-nerved, 2 lines long; floral glumes lanceolate, acute,
barely, if at all, mucronate, rigid, 2 lines long, smooth, 2 lateral nerves vanishing
before reaching the margin, palet oblong, obtuse, rigid, 2-keeled, ciliate, 14 lines
long, becoming strongly arched.

Grain oval, reddish brown.

PLATE XLIV; a, spikelet; b, empty glumes; c, floral glumes, dorsal and side
view; d, palet.

Texas and New Mexico, northward to Kansas.

XLIV.

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DIPLACHNE RIGIDA, Vasey.

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No. 45.
DIPLACHNE VISCIDA Scrib.

Plant-annual or short-lived perennial, light green or somewhat purplish on
sheaths and inflorescence.

Culms erect, or low and spreading from a tufted base, branching freely, geni-
culate, hollow, terete, smooth, 6 to 15 inches tall.

Leaves; radical and from radical shoots, few and short; of stem 3 to 5; sheaths
about equaling internode, compressed, open, smooth; blade flat or folded, with
slightly involute margins, somewhat scabrous above and below, 2 to 4 inches long;
ligule membranaceous, truncate, lacerate, 7 line long.

Inflorescence a rather compact, narrow, erect panicle, 2 to 3 inches long,
included at the base; rachis angular, slightly hispid; branches slender, alternate,
appressed or somewhat spreading at maturity, 4 to 1 inch long, bearing 6 to 10
appressed, nearly sessile spikelets on the flattened rachis.

Spikelets oblong, 4- to 6-flowered, 2 to 24 lines long; internode of slender
rachilla articulate below, + line long; first glume ovate, acute, hyaline, scabrous
on the single nerve, 1 line long; second glume same, scarcely 4 line longer; floral
glumes elliptical-oblong, 1 line long, 2 hyaline lobes or teeth at summit somewhat
lacerate, lateral nerves nearly marginal, pubescent below, vanishing in the margin
in very obscure teeth, mucronate awn of mid-nerve 4 line long; palet elliptic-oblong,
hyaline, with 2 scabrous nerves and shallow cleft apex, minutely ciliate.

Grain light, opaque amber, with brown scar, elliptic, flattish, $ line long,
falling with flower or spikelet nearly complete.

PLATE XLV; a, spikelet; 6, empty glumes; c, floral glumes, dorsal and side
views; d, palet.

New Mexico, Arizona, and Mexico,

PLATE XLV.

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THolm de.

DIPLACHNE

No. 46.
ERAGROSTIS CURTIPEDICELLATA Buckley.

Plant perennial, tufted with numerous abortive culms at bulbous base.

Roots coarse, with dense, tawny root hairs.

Culms stout, erect, rarely branching, terete, nearly solid, smooth, 1 to 2
feet tall.

Leaves of sterile culms rather numerous, with more or less involute blades 3
to 6 inches long; of stem 4 to 8; sheaths exceeding the internodes, open and rather
loose above, smooth or with few scattered hairs along the exposed margins; blade
involute toward the tapering point, 2 to 25 lines wide, 4 to 6 inches long, smooth,
rigid; ligule and throat, a row of fine hairs 2 to 2} lines long; sheaths and lower
sides of leaf often glandular viscid.

Inflorescence an oblong pyramidal erect panicle 8 to 12 inches long; spreading
branches 3 to 5 inches long, much subdivided, mostly alternate, with tufts of
white hairs in the axils, the solitary appressed spikelets borne mostly on strict,
hispid lateral branchlets.

Spikelets, oblong-linear, less than 1 line wide, 2 to 3 lines long, often purplish,
on hispid pedicels less than half their own length, internodes of the slightly zigzag
rachilla 4 line long; first and second glumes ovate, acute, carinate, thin, herba-
ceous, l-nerved, minutely hispid on keel above, $ line long; floral glumes lanceo-
late, acute, prominently nerved, # line long; palet linear, curved so that its two
pubescent nerves appear outside of the flowering glume.

Grain, amber color, narrowly cylindrical, 4 line long.

PLATE XLVI; a, spikelet; b, empty glumes; c, floral glume; d, palet. The
figure does not show the hairy a

This species is closely related to H. pectinacea, being less diffuse, with shorter
branches and larger spikelets.

It seems to be pretty closely confined to Texas and northward to southern
Kansas.

ERAGROSTIS CURTIPEDICELLATA

PLATE XLVI.

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No. 47.
ERAGROSTIS LUGENS Nees. (Hragrostis pilifera Scheele ?)

Plant perennial, from a slightly bulbous base.

Roots numerous, rather coarse, long, not branching, and with few fibrille.

Culms tufted, slender, erect, simple, solid, nearly terete, smooth, 15 to 3 feet
tall. ;

Leaves; the lower from abortive culms, with scarious sheaths, and slender,
involute blades, 3 to 6 inches long; of stem 3 or 4; sheaths 3 length of internode,
striate, loose, smooth; blade flat below, involute toward the long, tapering point,
a few scattered hairs above the ligule, otherwise smooth, 3 to 6 inches long; ligule
a prominent line of crowded, white hairs, 2 lines long.

Inflorescence a loose, erect, pyramidal panicle, 8 to 10 inches long, included at
base in upper sheath when young, rachis grooved above each branch; branches
capillary, mostly alternate, minutely scabrous toward the ends, and bearing a few
white hairs at the axils, flexuous, lower ones 3 to 6 inches long, subdividing nearly
to the base, bearing 15 to 20 spikelets on the long, filiform branchlets.

Spikelets linear-lanceolate, 4 to 5 lines long, on slender pedicels as long as them-
selves, or much longer, 5- to 11-flowered; internodes of rachilla $ line long; first
and second glumes nearly alike, scarious margined, broadly ovate, nearly acute,
obscurely 1-nerved, 1 line long; floral glumes scarious above, broadly ovate,
obscurely 3-nerved, smooth, 1 to 14 lines long;. palet linear, membranaceous,
arched, smooth, 1 line long.

Grain reddish brown, rhomboidal, 4 line long.

PLATE XLVILI; a, spikelet with pedicel; b, empty glumes; c, floral glume
dorsal and side views; d, palet and stigmas. The plate does not represent the hairs ©
of the ligule.

Texas and New Mexico.
This species is very near our H. capillaris, and varies considerably in the length
of leaves and size of panicle; it is also near Hragrostis Mexicana Link.

Ml
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T.Holm, det

ERAGROSTIS LUGENS. Nees.

PLATE XLVI

No. 48. .
ERAGROSTIS OXYLEPIS Torr. (Poa interrupta Nutt.)

Plant annual or a short-lived perennial, from slightly enlarged base, light
green, usually tinged with purple, especially in the inflorescence.

Roots with abundant coarse root hairs, sometimes branching.

Culms ascending, prominently geniculate, hollow, not branching, terete,
smooth, 1 to 2 feet tall.

Leaves numerous; from abortive culms, involute, 8 to 12 inches long; of stem
2 or 3; sheaths nearly equaling or usually exceeding the lower internodes, smooth,
open above but appressed to culm, blade involute with slender rigid point, 3 to 6
inches long; ligule a dense tuft of fine hairs 2 lines long.

LT: flares nee an irregular, oblong panicle, of dense clusters of spikelets nearly
sessile on the branches, which are short above, the lower sometimes 1 to 3 inches
long, erect, and at irregular intervals on the rachis.

Spikelets oblong-lanceolate, compressed, 2 to 3 lines wide, 7 to 9 lines long, 20-
to 30-flowered; sranerenodles of zigzag rachilla + line long, with minute pubescence at
each node; first glume narrowly ovate, penne! carinate, 1-nerved, hispid on the
keel, scarcely 1 line long; second glume same as first but 4line longer; floral glumes
ovate, acute, carinate, hispid on keel above, 3-nerved, 14 to 2 lines long; palet
elliptical, cleft at apex, ciliate on the two reflexed arched marginal nerves, 1 to 14
lines long.

Grams not abundant, translucent amber color, narrowly conical, nearly +
line long.

PuaTe XLVIII, 1; a, empty glumes; b, floral glume dorsal and side views;
c, palet.

PLATE XLVIII, 2; another form, with panicle more interrupted and branches
longer; a’, empty glumes; 0’, floral glume, dorsal and side views; c’, palet.

Gulf States, Texas, and northward to Kansas.

TE XLVI

Nee Jal

PLA

ees

ae

OXYLEPIS , Torr.

TES

(e!
tS)

BRAGIRO

No. 49.
ERAGROSTIS PURSHII Shrad.

Plant annual, diffuse, spreading from a tufted base.

Roots sometimes secondary from lower nodes, seldom branched.

Culms ascending, often prominently geniculate, shghtly compressed, and
grooved or flattened above each sheath, smooth, often branching below, 15 to 20
inches tall.

Leaves of sterile culms rather numerous, with flat or shghtly involute blades
3 to 6 inches long; of stem 3 or 4; sheath 1 to 2 lines wide, 4 to 7 inches long;
ligule a spreading tuft of fine white hairs 1; lines long.

Inflorescence a rather loose, olblloms panicle, 5 to 7 inches long; rachis angular,
somewhat flexuous, branches 1, 2, or 3 in a place, 2 to 4 inches long, with few or no
hairs at the axis, bearing 12 to 20 sited spikelets on angular, twisted, hispid
pedicels of varying lengths.

“Spikelets linear-lanceolate, 5- to 10-flowered, 2 to 35 lines long; internodes of
slender rachilla 4 line long; = glume ovate, acute, minutely hispid on back
above, 1-nerved, 4 line long; second glume same as first but near twice as large;
floral glumes br eae ovate, acutish, convex, scarious, 3-nerved, § to nearly 1 line
long; palet linear-oblong, minutely pubescent on the 2 nerves, 3 ae long, arched,
remaining on the rachilla after the seed falls with the floral glume.

Gram amber colored, oblong, 4 line long.

PLATE XLIX; a, spikelet with pedicel; }, empty glumes; 0’, and b”, apexes
of empty glumes; ¢, floral glume, dorsal and side view; d, palet.

Texas to Arizona and Mexico. In the Northern States this species seems to
be confused with Hragrostis pilosa.

XLIX
T. Holme, det.

PIGATE

ERAGROSTIS PURSHII, Schrad.

No. 50.

ELYMUS SITANION Schultes. (Sitanion elymoides Raf. Polyanthrix
Hystrix Nees.)

Plant annual, or short-lived perennial, from rather bulbous base.

Culms tufted at base with many radical shoots, erect, unbranched, terete, hol-
low, nearly smooth, 6 to 18 inches tall.

Radical leaves mostly membranaceous scales, or leafless sheaths, those from
radical shoots numerous, striate, often pubescent, or nearly glabrous on sheaths
and blades below; blade flat or slightly involute, rigid, hispid above, 13 lines wide,
4to 6 inches long; leaves of culm 3, rarely 4; sheaths longer than internodes;
blades like those of radical shoots, ligule an inconspicuous, narrow, membrana-
ceous line, often auriculate on one or both sides.

Inflorescence a rather loose spike 2 to 3 inches long; rachis articulate at base
of each flattened internode, and easily separating.

Spikelets 2 at each node of the rachis, nearly sessile, lanceolate, 5 to 6 lines
long, not including the awns, 1- to 5-flowered; upper flowers sterile; first and sec-
ond glumes nearly equal, side by side in front of the spikelet, narrow, 2-nerved at
base, terminating in a divergent hispid awn 2to4 inches long; floral glumes ovate-
lanceolate, acute, round on back, enveloping seed and palet, finely scabrous, indis-
tinctly 5-nerved, terminating in a hispid awn 2 to 2% inches long, the upper
imperfect glumes short-awned; palet lance-linear, obtuse, hispid on the two nerves,
margins reflexed, flat, one-half line wide, folded, 4 to 44 lines long.

Grain dull brown, linear, wrinkled lengthwise, 24 lines long, adherent to palet
and enveloping glume.

- Extensively diffused over the arid and desert districts of the West, from the
Missouri to the Pacific, and from Dakota to Texas, presenting great diversity of
size and appearance. Sometimes the empty glumes are divided into three parts.

PLATE L; a, spikelet; 0, floral glume; c¢, palet.

i

N

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fy Q
na t
E NS
. =|
j nN

ELEES.

SITANION, Sehzd

ELYMUS

i}
vay

ius Bien & Co lith

CORRECTIONS AND EMENDATIONS.

VASER EL OL.

No. 5. Setaria caudata, second line, Plant annual. The drawing represents a
perennial form or species common in western Texas, Arizona, New Mexico, and
northern Mexico. There is, however, a closely related form which is annual.

No. 11. Hilaria mutica Benth. It should be stated that this is Plewraphis
mutica Buckley. Mr. Bentham united the genus with Hilaria, and according to
the views of some botanists Buckley’s name should follow the species in paren-
theses; thus, Hilaria mutica (Buckley) Bentham.

No. 15. EHlionurus, plate 15. The specific name at the bottom of the plate
should be barbiculmis.

Plate 19. Andropogon hirtiflorws Kth. The figures a and 6 do not well repre-
sent the glumes of the species. It is probable that by mistake the drawings were
made from spikelets of A. scoparius. The first empty glume should be represented
as narrow and acuminate at apex, with the back scabrous-roughened and hairy.

Plate 23. Aristida divaricata H. B. K. This is Aristida Humboldtiana Trin.
Trinius excludes A. divaricata as a mixed and uncertain species.

Plate 27. Hpicampes macroura Kth. Iwas misled by the specimen in the
United States Herbarium (No. 1973 C. Wright’s New Mexican Coll.) in naming
this species. HKyvidently it is not EH. macroura Kth., which has a dense, cylindrical
spicate panicle. It is Hpicampes ligulata Scrib. Fournier in KEnumeratio Mexi-
canarum Plantarum enumerates 13 Mexican species of Hpicampes, of which we
have too little representation to determine if our plant is among the number.

Plate 28. This is the Cinna macroura of Thurber in the Botany of California,
but not of Kth.

Plate 29. Chloris elegans H. B. K. is believed to be a synonym.

Plate 32. This is Hustachys glauca Chap. That genus being now united to
Chloris, it becomes C. glauca (Chap.) Vasey.

Plate 45. Bouteloua stricta. It should have been stated that this species was
collected by G. C. Nealley in western Texas.

Plate 47. The figures 1 and 2 in the plate should be transposed, No. 1 being
the female plant, No. 2 the male plant.

Plate 48. Hremochloé. This name, or one too close to it, viz, Hremochloa
Buse, is one of earlier date for a different genus; and Professor Hackel has named
our plant Blepharidachne.

CORRECTION Se AND ae MGE IN DYSON:

PART II.

Plate 2. Add after the name (Thurber).

Plate 14. Transpose the numbers 1 and 2 of the plate.

Plate 30. Karwinskiana should be Karwinskianus.

Plate 33. Albescews should be albescens.

Plate 38. The name on the plate should read Triodia stricta (Torr.) Vasey; it
was Tricuspis stricta Torr.

Plate 40. The name should read Triodia trinerviglumis (Munro). It was
Tricuspis trinerviglumis Munro, the genus being united to Triodia by. Mr.
Bentham.

Plate 42. In like manner the name here should be Diplachne wmbricata
(Thurb.), as it was Leptochloa imbricata Thurb. in Bot. California,

Plate 43. Strike out the letter s in Reverschonz.

Plate 44. The name should read Diplachne rigida (Munro) Vasey. It was
Leptochloa rigida Munro.

Plate 46. Add Buckl. after the name,

U.S. DEPARTMENT OF AGRICULTURE.

DIVISION OF BOTANY.

ILLUSTRATIONS OF NORTH AMERICAN GRASSES.

VCO see Er:

GRASSES OF THE SOUTHWEST.

PLATES AND DESCRIPTIONS

OF THE

GRASSES OF THE DESERT REGION OF WESTERN TEXAS, NEW MEXICO,
ARIZONA, AND SOUTHERN CALIFORNIA.

By Dr. GEO. VASEY,

BOTANIST, DEPARTMENT OF AGRICULTURE.

PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE.

WASHINGTON :
GOVERNMENT PRINTING OFFICE.
Itsy) Ihe

Pe Or LeANSMID TAT.

WASHINGTON, September, 1891.
S1r: I have the honor of presenting for publication the first volume of the pro-
posed work called ‘‘ Illustrations of North American Grasses,” which have been
issued as Bulletin No. 12, parts 1 and 11; and it is proposed to follow this with a
second volume of plates and descriptions of the ‘‘ Grasses of the Pacific Coast.”
Respectfully,
GEO. VASEY,
Botanist.
Hon. J. M. Rusk,
Secretary of Agriculture.

Cgekoeee oN DEX OF PLATES:

Part.

Le viRhadm Gea OAS Sooactacoes 6100086 60 C62 CRC RRB EEE Een anne Sirs Ants I

RRO GOR GHATS oS.nc S000 a900. 28 0950.0. 80000000 NOe aE tt SSH aaa nner oI na Gio. I

(nn iMOrnMSs So Sa c'Wio'o G80 HOD 6. 6.0.06 60-0 CORR TET ee ae eae meer Past este I

SACCHANOIG CSR eee TO Ines) aie dins whet wa dieysiasa Qaccie ce Gees Jee I

Aired Orla Le epee tr MRP IT eR IR Tota e kee cose sieve Sievd. oe ocolbs. lavg lee wlpheie-a suarprane I

cisiidia. ATTZOMICR Sob Goats. 26c0 tedbudco me 008.0 600.66. 0 1O IOC ERC eae ect nnenr eenee neni as U

GITATIGAUID, Sia's elo. oad 4 Sa Sd OD NOUS 0 ON dlelG- cd 6S 6 CRIA EI SE nar na teat eee mere air I

(DUODUREE coo. ocoodasadiopodooncenclonbob000 due UDEROROnn COT Aa rOe caenemE ee nics II

aH, QUOD, oS ocdb oc Sce Hw OOo de obo ons 8O kU EI ETE OTe etna REE nn ata I

ITS O1G CS Ieee EET RII sion > wilt seers pidie s wisleayie b/w 'ersieide eetate I

Burkeles. 3 Hage 600 CHOCO ED. 9:6 000.0000. OC TCE ERR Cree eae I

eriSpoda 356.090.9000 CBs 9150.00 0 Src.0 bles olga 8.0 ASIC Ce ae ENCE eon nee meme I

SE Vetavicl CL PAE MPN I ett eee Cee eerie ciate cis. veces ein cose level ace evepalenseuevene I

HLINEED oogbougoeenceoudncd 24 ean odo ge cUun Tea eOouanES Hela shavandelensiecece ere cee I

Bhomlnaldtiinitiay occ gap nbve seca 70 0b ON Ue DO CCEA EERE teen aene aI te I

CHONG) noe eoogdeged gobeoehodc0b.s> CO See TaN ene eet een err se I

prostrata...... PT ee ee ee ict ve te Trish ayeic ss aie ae giasereie(aveveiecs eisialyalsctisrnts I

PECOTMORE o oo Su ond, DODODS OHO SO bob aml bOR.db 0 0) COO E ee a eee ae I

PEANCED, 05 cdooecotedcn COs Obs bobo 6 Od O00 6nd Chen ee eee nee eame I

EATHG S00) SHINGCIR 5 o0c0wo0b Addo ClO BEDI D0 6.8 9 SO OS IO ob OO OGLE eee EE en tater ae ane I

HHO, po onneucoopcoueeee boo Fos 600s. 68 bon S100 Oe ere e ER tet te eee Ter ete I

EMA MOA ACUYLOLGCS 0 say yaciiie ge eiere chloe ani Mesee cis aiaacs aes + 0.0 0000.5 EO CEI aT I

SP THHESLECHMINCL CCUM: a coe, «aia oie eickd elaks ere sued ows a aitS Gye ve MPMI oye oe areca), orale cevalevele Oy sr ehale rennet I

Cenchrus myosuroides...... MPT NTT eo scaieiGinaiere? sedcaudiasioras wraveleeeere I

ERIDULOL eS ten tee eae ee ee 60100 “6 oO eee ee I

“UL LEDS 25 Jo06 eddenedt obise BEBE 5064 oo ber ha UG crs Olona nent I

TILA, 6 Se OC Eee eee BSG coda seo s.aGoUld.c 6bb.00 OU CORSE ee Ener ae ees I

EL ULIBHIRY oe 5 cola do FBO Bh eid 6 do ale-o G10 or0lcid STR CLE EG eat ene one aan I

LIATE 5 cog se00d0 HOBO OSES 0000 5 OSS Sota ICI e eae eta ania eee nee I

PUHIBUALAM ANSE Anti siete whe eles wep MM ee a ase age aie Se caye eI: II

MSHA GUN CPR oes asso co eso ecu levee eit ahitacess. doves eh oaiters Pep eashemice te efs e suse eee I

CHINES, G4 LDL GiROTGSS See). BASS QUO OOO be as Ole WOO OOO e Ge ee eee tee ana ne reereee II

LUE TER TAGARTIRIME 35 lo does SSNCoOO CEC OROOS OLE He eee cna rita lannnarenner ier II

OREN Ee ic PE EP ee Tete eS aielsi male Gide @ ce a's vie bee wines II

Sea T GLO ETT te Pa eee Pa) hs icicle oe veyed dain lstaidle weed asus ta saws II

WEBS. « 50290 0G BS eR ORD OS ON OR ERO OLS Ree ee ee ere II

SALES (21h MIR eS ct Lato Bie Siafdicie a4 er ayeip ene asians II

PDVRGISTETUS. | DETISICMIS ~ 5, od oe ROS AHO A RCRD Eee Ie aCe I

HNPERUNGES -ccocoledsnaces Bae Gee tee eee eee eee II

I yr Wael eat Oe cc cau cusocecnueecuscerceseceaenes II

Bis LC2RN Rad eRe Oe cn ae ct ep ed abe cn dletescecetaeteuecs I

rigens... .. II Soci esc cod Pala, 0 alti a (auvvauatae8°s 8's ev aibi Sid gaareueos I

Eiragr OSbIS (Gieeie ie ier TM ne iv nee cede leecuwsedsnceecucses II

RE ie es ne cals eens ued ectetecucviaemedaneas II

SUIS ols ccon -nekece te ee ee II

csc ce cect eedeeseeescacunees 1

Eremochlo€ Bisclo Gi elie cee cueues @ ceeeueceeues I

Kan B11 Soe Rai. ees yA. Seyi ey I

Eriochloa, setieea gee oi eseecaeeseneness il
Vv

Plate.
12
18
il)
20
21
22
23

VI INDEX.

Part.
LE(QIGRO) HOON COMMONS Gon gonosdsoapnobdcodsaunocdo nD On s0q00G0qudeq0qe car feet) jauctink menial I
1s eink Gael ROA UR ANT oyO tuo shod asosoegdsdmasiouedsuacedosen Go sooddéedbodeouoe I
TINUUELC Ape eso tela ere EMP NE Sien ear ert nner Ennio Mal hat! Wain. daa'a G0 49° 0.0.0 I
TIAN Bay qecaunee addons eos Re HO aR aA ACURA RAE AG ae OG oD adn a daecln Gao. co a0 0: II
Lycurus phleoides........... Pee Ren eM nem Mammen es opln.c ash o OWA tooo 0 5 UE
IMelicandithusaienica.) act Oe ee Eee MAUR SOMA Mapa cob aci6'S¢ Boe Cook I
1B20VE Tae ER GE Rot Sh MCE E A BERS AHO OSES Ado COB odio Vago ad _Biisasntcers: eee eae I
Muhlenbersial Buckle yanmar ie siecle eee meter ante yeti eter keto eeea II
depauperatarsey Ayeoie a ee. s Waltyrterscelel Ri Welter ond Arctet tel cain eae te eee nea II
Ghitnel aX) Non dILMRO a Ney vate sancddeldmsccoisiadhsedb0n000 Soo obL ab o0es00% I
Parolliododguas adnooamensbeoadousb. doops soecoddaspdecvddqann do Seas o0 dK oe I
Neo=Mexicamaty ct ssc cpvee clon ac oe ey a acne ec Eae toner ate II
Schasfinertiicicine sven yas ycind Gh) aclsadieeen s@ austere ys coat east he) aes eects ee ee II
WW GbNANROE) SOMRNAKOSE. S56 Gnu s0s06000 c000K06 6600000 Suondoaddadd0ddvuEcacanSeDON OU S506 II
OVA USS) ThANOYMIEMIAY 5 'cc00 500000000 be008 6600 DOdUEAODdSanODH DADO aD SO UOEDODSHODGaNS Il
TE MUDLAMACED fips sts ahaa astra, Soars arareneild so es aoe a cheneeey PCS Ae tes te eRe Rae oe ee Il
Panicum: bulboswmy’ yr hs eee. sis averehe coy saan ta cloia 3/2 Seen eye ese elon eee ra e I
oli holstjlochv hana ee ee nM MEmERRBeY Mic ct sng Gigde adc sclon's.co8.0 ced i
lachnanth umn. 4h sas sa wis ce ented ota eas aio as eR ene te eee eee ioe area if
iRaspalumuedistic hum neem nen ark e een eg Useua/an Lowe Seo aS See Eee it
Ibhaiohb toons a we ee mee as On Bre Vo eae arate aieoteton TaN yeh an Sorted o's II
Pubiflorumi we AHN echt de sees sale elie ele theo tere lone: mee eae ee ee ne II
Phalarishintermediagavaranoustary-yy-e ocr. ent sai ieee keene eee Il
PAV TNO OAOVURAN GHOSTAIAN 5. o5oo0nncccco magnososo0DHDOn boo SOESOOLaGONC cele eae ea II
Wari oda tiie Nays ect hc tie ciskslsnen pOiane ators agus sae OS hee eR on eee Ree Newer EI
Schedontiardus: Nexans 2 i 22a Bin oe dyas, ¢ Wel eePsn ale Goll ote a en 18
Scleropogon: Karwinskiamusisea24 chee oats dave Garis Selehe sist) eee leila eee eee II
Setanta caudate s)(saisad sacs sciume aes biased boot Midigelapeleteid le ea ee I
S} NOON ARAM da dopaakpesamednsdascosoneaboogboddcgsasor ocd bboc to cu ub Smo tco as s,s; ohm
Buekleyia os Sonu: ated oh Ged eae s wb te dete es revi cia lapeite ee (ot
VON OULU ein ae a ee iA AIMEE racnidstcocaosaqes IT
HHUCMIOMEWE secodpos cosaeec ERY Scere Oa BaH ae ea a tat. Ca: Aivic 410% IT
Wiriehtil sess heey ea ae ees ree eee ler ein eke SER er II
Stenotaphrum:) Amenicamumns soo. cect) ale cere se ine ol Seales avon es ete Scene If
Stipa flexmosa: «...2caak aocisls Co Suede gia wv base siee tie, ele ete lt cle oe oe On ee I
POT Abas, <descave bietacey shel rncateyeeraie ouede ues tel alee everest aap cee her mere ES Mtoe Sato) o-c bi oe It
SOVIDNEP A tSyie, Pe sie ces steauel a dade ots All ccape eueratate se satscaveue alain OSes ee er II
Thurberia, Arkansama oo. lly ee ee ec iwnre aR AS © aD eee ee eee I
Trachypogon poly m orphusis ys: de. ea soe acim crottenaebs neice) nee rele Creech ane ae eee I
PVA US TACCMMOSUS Hees dresses peta san., Saves: x bas peuesarn ls vcduece role everererecene WES eee I
rich Onis, Plucifl onan esse coe eee eke he ee eee Ns lee eee eee II
VEFUICIMA LA casita aciedy. aa dues yaeeleneaee aie MEE ee eee, er II
Triodia acuminata. ssteeied Seco saunas Ue einehe ehetenionenls Rie AER Een tee eee IL
aIbESCENS tees yom ee nace eaten ener wncyuiopioGieic. “Anb aMetay SOROHE Ss Ee II
ELASTOSTOLMES ie. sieht, gous areca, bins doce aes 4 a chee sloter ane ole eolenee cae cease) a ee II
Fea ena ULOO I ieee ee eee Ren GORMAN diycmebs Gi dikboe ooo kano d0docan II
Neéalleya si edccsck astaic ee cbtaveu eine aeverties, & BS ese tee ae II
pulchellaye. jsrateccenns wars eee sees ete cetera 2 Tatsie ath gth ore ie AL ae oae rs See Ii
S109 (01: oie ae eee ieee Bem N TS Ae PIE Ht airinidic.o oo oabs ads 06 II
U2). ¢2h 0 ee or ee ee Re, Sew reves Gly rsistioddaroo, tdnooe coe II
trinerviglwmals 25. hec.ie2 ie jcdice ph coeine eres HOS OO A nee ae ae 10
Wrisetum Halli. a iradis where “dsl s Mavi Neeeue seme secre ate ele Con cee ae II

Plate.
16
10
11

2
15
49
50
12
14
25
26
13
14

@arnaan

CE Come t=

37

Ai ey
Posies

Sechelt acta SMITHSONIAN INSTITUTION LIBRARIES ee eee

iii

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‘ Pay Beaesretrerty tare on eae , ‘ 4 St ts
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