saunotated List

of the Plants
Growing Naturally at
the National Arboretum

National Arboretum
Contribution No. 1

August 1953

UNITED STATES DEPARTMENT OF AGRICULTURE
NATIONAL ARBORETUM WASHINGTON, D. C.

Smithsonian
Institution
Libraries

Gift of
Stanwyn Shetler

/ Mar, 2 00s-

Annotated List of the Plants
Growing Naturally at the
National Arboretum

OLIVER M. FREEMAN

Formerly Botanist and Curator
Living Plant Collections
United States National Arboretum
Bureau of Plant Industry, Soils, and Agricultural Engineering
Agricultural Research Administration

Nattonal Arboretum
Contribution No. 1
August 1953

NATIONAL ARBORETUM
UNITED STATES DEPARTMENT OF AGRICULTURE
WASHINGTON, D. C.

For sale by the Superintendent of Documents, Government Printing Office
Washington 25, D. C. Price 20 cents

Le Son Jw) lap &
‘a ten tied
a Ly
\ an
h
i “| ; t
i x +
1 ¢ i"
| ». he }
j Pavctee it | )
1 if;
haath
¥ %
=
’
J
> A i ¢
® ul Pale . / vo
‘ ; a es :
+ ‘ : } oe A ‘
\ A
| a . \
a> ie hae
: 4
rm - r
i us
‘ = | - ’
\| bs Bae
ye
+4 i
¢ if ;
7
[
\ E
i
\ 4
Be
pi Meee
es +
s 4 /
‘ \
¥ . r a mn
¥ &
= ——
A =,
=
p
- ‘a
& re
= . 4 ; _
> f
~ a u
eee i +
‘ pie eee
j
’
h
‘ ‘ z De ease ey i
‘ a7
. . $ (
rc 4 ie Kip ;
(a { Pk
he
‘ r "| t 4 t a
. \ i
1
/ ‘
2 \ » ; A ea Ae
: Ly; Cee hi 27
i" aly i ;
/ Y)
mi ex Le) AN My
> “1 i v : 7 4’
( ht 4 Ks Oey ate
" J 4 Toa
; wt TG gah PR ie
t mn | , fecha ie
are Y 2 ¢
y" é |
= ¢, fe
. hin PR
@ LU
é ne
mn
i
°
Pd
;
7 . ae

Annotated List of the Plants Growing Naturally
at the National Arboretum

OLIVER M. FREEMAN!

An understanding of why plants native to the eastern United States are
now either abundant, rare, or absent at the National Arboretum depends on a
knowledge of the soils, moisture, drainage, and general land usage previous to
and after purchase of the Arboretum tract by the Federal Government in 1927.

Before 1927 about half of the 420-acre area was used for field crops and
truck gardens. This brought in the usual weeds associated with such activities.
Before erection of a fence in 1934 and 1935, the wooded areas were burned
over nearly every year, destroying much of the leafmold that is required by
many of the choicest plants. The need for leafmold is especially noticeable
with rattlesnake-plantain, Goodyera pubescens, which was undoubtedly abun-
dant many years ago. Only one plant of this little orchid was found in 1949.

Many of the original colonies of native plants have been destroyed by
encroachment of Japanese honeysuckle, Lonicera japonica. Erosion of culti-
vated and other disturbed soil has undoubtedly changed the flora in small
areas. Also, some changes are being made each year by road construction,
grading, and landscaping.

The area is composed of rolling land with relatively few level fields between
the higher elevations. The southwestern part of the grounds is dominated
by Mount Hamilton (alt. 239 feet), most of which is covered with the original
trees. The east-central part is dominated by Hickey Hill, which overlooks the
Anacostia River. Hickey Run flows through the center from a northwesterly
to a southeasterly direction, forming a broad valley between the two elevations
named above.

Soils range from sandy loam to heavy clay. There are several small areas
of gravel and others of ironstone concretions. Layers of sand, gravel, and
ironstone resting on clay have given rise to numerous springs, hillside seep-
ages, and swamps, providing suitable spots for plants requiring wet soil.
Along the eastern edge of the area is the Anacostia River with its steep
wooded banks and tidewater plant associations at their bases. These areas of
wet soil have developed a flora quite distinct from that found in the normal
woodlands. The soil reactions range from neutral to slightly acid, becoming
very acid in the leafmold deposits associated with mountain-laurel.

The plants listed are those known to be growing naturally as of this date
within the fenced boundaries of the Arboretum or upon the narrow strip of
alluvial flats between the unfenced eastern boundary and the stone wall along
the Anacostia River from Hickey Run to the Licking Banks Spring.

This list includes the plants reported in unpublished lists prepared in 1918
by Ivar Tidestrom and in 1934 and following years by E. C. Leonard, except

1 Retired.

*‘}X9}_: “UT 0} PdITojJaI sadusTINIDO yueyid oy1ads JOJ suoTyIOT—T FANS

od 0001 os ow Ld or © Oot oe
27s
2st
0'd ‘NOLONIHSVM
WOLAYOdNV TYNOILLVN

OV JO LNAWLYVddad 'S’

BS) 91

61 g, ZI

2uNW)
NIWLNNOW

SONILNVId

DILGONAS

=GE SOOM WENLVYN
Barads ATOH

Sa00m
TWUNLYN

AuaSunN

ae Ss Te | CS 8 SATS

those obviously collected outside of the above-described area. All of the
collectors, including the present writer, have deposited specimens with the
National Herbarium of the Smithsonian Institution or with the Herbarium
of the United States National Arboretum. Since preparation of the manuscript,
the inclusion of several plants hitherto omitted has resulted from the sugges-
tions of P. L. Ricker, President, Wildflower Preservation Society, as a result
of his familiarity with plants of the Washington district and the Arboretum.
A few plants of special interest growing only just outside the Arboretum
property lines will be mentioned in the list with appropriate notation. For
convenience of reference, botanical nomenclature follows that of the eighth
edition of Gray’s Manual of Botany.

The locations referred to by number in these notes are indicated on the
accompanying map (fig. 1). They are taken from a more accurate grid survey
prepared by the writer in 1950, which is available for reference purposes at
the Arboretum.

EQUISETACEAE

Seeeetmmeatvemse |... le tee eek COMMON HORSETAIL.

Occasional, locations 55 and 28.

LYCOPODIACEAE

Lycopodium complanatum var. flabelliforme Fern.
GROUNDCEDAR, GROUNDPINE.

Occasional in thickets having a moist acid soil.

OPHIOGLOSSACEAE

Botrychium dissectum forma obliquum (Muhl.) Fern........ GRAPEFERN.

Rare, found in locations 12 and 45. This species matures its spores in
autumn. ;

Bottyenwum virginianum (L.) Sw................... RATTLESNAKEFERN.

Frequent in thin woods.

Sem villeatam DL. .. 8. eee eee ADDERSTONGUE.

Rare, not found in recent years.

OSMUNDACEAE
mmerrretiamonied Vo. sc ch nev eed ee eee ee CINNAMONFERN,
Frequent in wet soil. Conspicuous on steep banks that are springy.

ET CIAVEOOIANA Di. cds i is ec ew en are cea es INTERRUPTED-FERN.

Steep bank near river, location 46.

Osmunda regalis var. spectabilis (Willd.) Gray............. ROYALFERN.
Rare, found in wet soil.

POLYPODIACEAE

Asplenium platyneuron (L.) Oakes............... EBONY SPLEENWORT.
Frequent on wooded slopes and in margins of woods.

Athyrium filix-femina var. asplenioides (Michx.) Farw........ LADYFERN.
Moist woods and ravines.

Athyrium thelypterioides (Michx.) Desv........... SILVERY SPLEENWORT.

Occasional in ravines.

Dennstaedtia punctilobula (Michx.) Moore......... HAY-SCENTED FERN.

Frequent in open woods. Large dense colonies are to be found just below
the north summit of Mount Hamilton, location 10.

Dryopteris hexagonoptera (Michx.) C. Chri.......... BROAD BEECHFERN.
Woods.
Dryopteris moveboracensis (L.) Gray................ NEw YORK FERN.

Frequent in moist woods and low ground.

Onoclea .sensibilis: Toso Anche 6 eis ae ee SENSITIVEFERN.

Frequent in moist woods and low ground along streams.

Polystichum acrostichoides (Michx.) Schott............ CHRISTMAS FERN.

Frequent in woods and on banks.

Pteridium aquilinum var. latiusculum (Desv.) Underw......... BRACKEN.
Common in dry sandy soil.

PINACEAE
Juniperus virginiana var. crebra Fern. & Grisc.. NORTH EASTERN REDCEDAR.
Frequent in woods and fields.

Pinus tietda Ma Jiccoiekeietcats sis ee ops ose sles oo PITCH PINE.
Hickey Hill and vicinity, location 43.

Pinus ‘virginiana IMAM Si Seon jorens iain oie, dnceh > La aa VIRGINIA PINE.

Common on dry slopes; forming dense stands in some places.

TYPHACEAE
Typha ampustibolia Ds oi. eve tein oteaecenet- 6 peste NARROWLEAF CATTAIL.
River margin near pistol range, location 40.

‘Pypha datebolia. eo. .asc¢0) ses en sees et h COMMON CATTAIL.
Margin of ponds and along edge of river.

4

SPARGANIACEAE
Seren ameticanum Nutt.....:..-.04- 0-205. e cece eee BURREED.
Wet soil.
Sparganium eurycarpum Engelm.
Wet soil, mostly along river.

ALISMATACEAE

Wumeria Supcordatum Raf.................00 cee ces WATER PLANTAIN.
Margin of ponds and in swampy places.

Sagittaria latifolia var. pubescens (Muhl.) J. G. Sm... DOWNY ARROWHEAD.
Shallow water or muddy soil.

Gemaria Jattiolia Willd... ... 02.0... eee eee COMMON ARROWHEAD.
Margin of river and ponds.

HYDROCHARITACEAE

Meemeemememensis MiICHK. | 2... cece ee bee ce eee ELODEA.
The two ponds near Hickey Run, locations 30 and 32.

GRAMINEAE

umemerom ecpens (L.) Beauv... . 2... 005.6. eee eee QUACKGRASS.
Common in open ground.

Agrostis alba L. (A. palustris of the 1919 “Flora of the
SI SEELOONIGIENAL \ psc 0 bc sicits cls ctaledas eames ce cede ees REDTOP.

Common in fields.

mmmmrartatia CWalt:) B.S.P.6 66. ec cee ee eee TICKLEGRASS.
Common in open ground.

Agrostis perennans (Walt.) Tuckerm.............. AUTUMN BENTGRASS.

Frequent in woods. -

Agrostis tenuis Sibth. (A. capillaris of the 1919 ‘Flora of the

A CUQITSTINIA, ). oo 8 ss 0 dm wee ae nine sake’ RHODE ISLAND BENT.
Grasslands.
Re ele aC kip ahd s adie kg cele new els a me 0a HAIRGRASS.

Dry sterile soil in several places, especially on Mount Hamilton and Hickey
Hill.

Seeeomogon elliott Chapm.........0..........058% ELLIOTT BLUESTEM.
Occasional in sterile, open ground.

mmaropogon scoparius Michx.................. 00805 LITTLE BLUESTEM.
Dry fields and open woods.

Andropogon ‘virginicus: LW. ose een ses Nan Raat BROOMSEDGE.

Common in fields and open woods.

Agthoxanthum. odoratum Lin. ae ee SWEET VERNALGRASS.

Common everywhere.

Aristida dichotoma: Michx...0/.2...0.25./.5.0. 28 CHURCHMOUSE THREEAWN.
Poor soil, frequent.

Aristida longespica Poir. (A. gracilis Ell.)
Poor soil, occasional.

Aristida oligantha Michx.
Open ground.

Aristida purpurascens Poir.
Woods and banks.

Bromus. commutatus. Schtad.... 0. 5.0 Pee te hee HAIRY BROMEGRASS.

Frequent in waste ground.

Cinnaiarundinaceai Ty) oe eee STOUT WOODREED.

Moist woods.

Cynodon dactylon (L.) Pers.

(Capriala daciylor ia.) WAAC nts clone ain else cle ane BERMUDA GRASS.

Lawns, roadsides, and waste places.

Dactylis: slometata’ Ly). 2 7 fh es ee oe ORCHARDGRASS.

Near Heart Pond, location 30.

Danthoata spicata (ih) (Beavis: : 0b. cca « vite wares: POVERTY OATGRASS.
Poor ground in woods.
Deschampsia flexuosa (L.) Trin... WAVY HAIRGRASS, CRINKLED HAIRGRASS.

Occasional in dry soil.

Disstaciay filiformius (ly Woek. ausc sok. bias kek ether ie SLENDER CRABGRASS,

Frequent in open ground,

Digitaria ischaemum (Schreb.) Muhl................ SMOOTH CRABGRASS,
Old fields and waste places.

Dipitaria sanpuinalis (1) SCOR ect. cera p's a ae oo ote i COMMON CRABGRASS.

Common in lawns and waste ground.

Echinochloa;crusgalli (1) Beauve i032). « ong onan BARNYARDGRASS.

Common in disturbed ground.

Blensine \indica (G..)) Gaerta is ois. nib «+ 8 eee GOOSEGRASS.
Common along paths and in fields.

i

SES 0 VIRGINIA WILDRYE.
Thin woods and open ground.

Elymus virginicus var. glabriflorus (Vasey) Bush
Roadside, location 44.

Seenerarcariiatis (L.) Nees... 2... eet ee ceeee es LACEGRASS.
Summit of Mount Hamilton, location 7.

Eragrostis megastachya (Koel.) Link (E. cilianensis Lutati) .. .STINKGRASS.
Open ground and waste places.

Eragrostis pectinacea (Michx.) Nees (E. caroliniana (Spreng.) Scribn.)
Frequent.

Festuca obtusa Biehler
Occasional in woods.

Festuca octoflora Walt.
Open ground.

Bemermveitiata (Lam.)' Hitchc.................-4.. FOWL MANNAGRASS.
Magnolia Swamp and Beech Spring Pond, locations 32 and 34.

Gymnopogon ambiguus (Michx.) B.S.P........ BEARDED SKELETONGRASS.
Occasional in woods.

Holcus lanatus L. (Notholcus lanatus (L.) Nash).......... VELVETGRASS.
Occasional, open ground.

Leersia oryzoides (L.) Swartz
Tidewater mud near pistol range, location 40.

Leersia virginica Willd.

Wet soil in woods.

Seeman perenne L.............. COMMON DARNEL, PERENNIAL RYEGRASS.
Meadows.
Pememerreertc a Walt. le ee ee eee TWOFLOWER MELIC.

Foot of cryptomeria ravine near the river, location 47.

SISBCHISIS JATICCTSS.) 00 cc see cheese nce te eees EULALIA.
Escape from cultivation, occasional.

Summenpetpia schreberi J. F. Gmel...... 1... ce eee NIMBLEWILL.
Frequent in disturbed ground.

ISTITUTO os hy ida Gos ale ie aes Wine ele Mhie BEAKED PANICUM.
Thin woods and open ground.

Panicum boscii Poir.

Common in woods.

Panicum boscii var. molle (Vasey) Hitchc. & Chase
Frequent, same habitat as the species.

Panicum clandestinum L.
Moist open ground.
Panicum columbianum Scribn.

Rare in sandy soil.

Panicum commutatum Schultes
Woods.

Panicum commutatum var. ashei (Pearson) Fern.
Frequent in dry open woods.

Panicum depauperatum Muhl.
Poor soil in open woods,

Panicum dichotomiflorum Michx.

Old fields and cultivated ground.

Panicum dichotomum L.
Near pistol range, location 40.

Panicum lanuginosum var. fasciculatum (Torr.) Fern. (P. huachucae var.

silvicola Hitchc. & Chase)
Open woods.

Panicum lindheimeri Nash
Moist open ground.
Panicum microcarpon Muhl.

Wet places and along streambanks.

Panicum polyanthes Schultes
Frequent in open ground.

Panicum scoparium Lam.

Wet ground along streams and borders of woods.

Panicum sphaerocarpon Ell.
Frequent in open ground.

Panicum stipitatum Nash
Wet soil near pistol range, location 40.

Panicum villosissimum Nash
Dry open ground.

Paspalum ciliatifolium var. muhlenbergii (Nash) Fern.
Open woods and old fields.

i tg

Paspalum laeve Michx.
Open ground.

Paspalum laeve var. pilosum Scribn.
Rare in moist ground.

Paspalum setaceum Michx.

Rare in open poor soil.

EMI ec ge ey eee ees COMMON TIMOTHY.
Frequent in fields and meadows.

Ee i eae al a Mew acs ANNUAL BLUEGRASS.
Common.
Is oe ein ek ele ee tes aie Vine a le CANADA BLUEGRASS.

Common in poor soils.
Poa cuspidata Nutt.

Open woods, occasional.

LSS ee ee ea KENTUCKY BLUEGRASS.
Common in grasslands.

MM eg ec eee ees ROUGHSTALK BLUEGRASS.
Occasional along watercourses and in location 1.

Setaria glauca (L.) Beauv.
(Chaetochloa lutescens (Weigel) Stuntz).......... BRISTLY FOXTAIL.

Common everywhere.

Merrsteumn tutans'(L.) Nash..........-.........00 00% INDIAN GRASS.
Old fields and woods.

Spartina pectinata Link (S. michauxiana Hitchc.)...... PRAIRIE CORDGRASS.
Wet soil, occasional.

Sphenopholis nitida (Spreng.) Scribn.
Shaded ground, not common.

ee ee BLACKSEED NEEDLEGRASS.
Frequent in woods.

Triodia flava (L.) Smyth (Tridens flavus (L.) Hitchc.)...... PURPLETOP.
Common in open ground.

Seememeum dactyloides L.. 20.0... ee EASTERN GAMAGRASS.
Fields, especially in low places.

MEINE Bae) JERE 5 kee idie win w lg Ts ian aa i's dp dle pee aaah SPIKEGRASS.

Sandy soil near river.

Zizania aquatica L. (Z. palustris of the 1919 ‘Flora of the
District of ‘Columbia. vce 4i ee oe ee ANNUAL WILDRICE.

Margin of Anacostia River, in tidewater mud.

CYPERACEAE
Bulbostylis capillaris (L.) C. B. Clarke
Frequent in disturbed sandy soil.

Carex amphibola var. turgida Fern.
(C.. grisea of thost authors, not Wahlenb.).-.. /.. 7). eee SEDGE.

Rich woods.

Carex annectens Bickn.
Frequent in fields.

Carex artitecta Mackenz.

Occasional in woods.

Carex blanda Dewey
Thin woods and open fields.

Carex bushii Mackenz.
Occasional in fields.

Carex cephalophora Muhl.
Wooded banks of streams. .

Carex complanata Torr. & Hook.
Meadows and thin woods.

Carex crinita Lam.
Wet soil.

Carex digitalis Willd.

Occasional in woods.

Carex emmonsii Dewey
Dry hillsides.

Carex laevivaginata (Kukenth.) Mackenz.

Common in wet soil.

Carex laxiculmis Schwein.
Wooded hillsides. |

Carex lupulina Muhl.
Wet soil.

Carex lurida Wahlenb.
Common in wet places.

10

* Carex muhlenbergii Schkuhr
Rare, found in open poor soil.
Carex rosea Schkuhr
Wooded slopes.
Carex rostrata Stokes
Rare, found in muddy places along river.
Carex scoparia Schkuhr
- Low ground.
Carex striatula Michx.
Woods and fields.
Carex stricta Lam.
Low ground along river.
Carex styloflexa Buckl.
Low wooded ground along river.
Carex swanii (Fern.) Mackenz.
Dry wooded banks.
Carex tribuloides Wahlenb.
Rich open woods.
Carex vulpinoidea Michx.
Common in wet places.
Cyperus dipsaciformis Fern.
Frequent in dry woods.
ME RCIICOIEUS Fe) ee ee ee ee CHUFA FLATSEDGE.
Fields and waste places.
Cyperus filiculmis Vahl
Dry sandy soil.
Cyperus ovularis (Michx.) Torr.
Frequent in dry fields and woods.
Cyperus rivularis Kunth
Margin of woods.
Cyperus strigosus L.

Common in fields and meadows.

Dulichium arundinaceum (L.) Britt................. THREE-WAY SEDGE.
Frequent in wet places.

Eleocharis obtusa (Willd.) Schultes................. BLUNT SPIKESEDGE.
Frequent in wet soil.

11

Eleocharis tenuis (Willd.) Schultes
Occasional in moist ground.

Rhynchospora gracilenta Gray
Thinly wooded hillsides.

Seiipus americanus, Perse. i605 Sh has hc menees ere AMERICAN BULRUSH.

Flood plain of river, occasional.

Scirpus atrovirens var. georgianus (Harper) Fern.
Low ground along river.

Scirpus fluviatilis (Torr.) Gray
Marshes along river.

Scirpus polyphyllus Vahl

Common in wet soil.
Scirpus rubricosus Fern.
Springy slopes.
Scirpus validus Vahl (S. validus var. creber Fern.)

Wet soil along margin of river.

ARACEAE

Arisaema triphyllum (L.) Schott (including all varieties based on size and
CONC pepe MEG. baci Say om Ogee isan 66'S. JACK-IN-THE-PULPIT.

Frequent in rich moist woods.

Peltandra. witeimica \(1:.) Schott .& Endl... 02) eee eee ARROW-ARUM.
Muddy places, especially along river.

Symplocatpus. foetidus (L:): INutt)........ 2:0) 4.92, SKUNKCABBAGE.
Wet spring hillsides and low wet ground.

COMMELINACEAE

Commielinay communis Lea 32 650 ies a ein dod = ote DAYFLOWER.
Rich woods, especially the east slope of Mount Hamilton, location 8.

PONTEDERIACEAE

POTIteHerid <COLM ALA WS See x kb hs ded i Ee PICKERELWEED.

Margin of river in tidal mud.

JUNCACEAE

Juncus arominatia- Miche! ooo ow eR Le ae ee RUSH.

Common in wet soil.

12

Juncus biflorus Ell.
Moist soil along drainage lines.

Juncus effusus var. solutus Fern. & Wieg.
Frequent in moist soil.

Juncus tenuis Willd.
Common in sandy soil and along paths.

Luzula bulbosa (Wood) Rydb.
Open woods and clearings.

Luzula echinata (Small) F. J. Hermann

Common in woods.

LILIACEAE
ES LEU Uae eR er FIELD GARLIC.
Fields and lawns everywhere.
0 Er GARDEN ASPARAGUS.
Fields and waste places.
Eryenronium ameticanum Ker................. YELLOW ADDERSTONGUE.

Found only along Hickey Run, at the point where the adjacent slopes meet
the flood plain of the creek, location 37.

ST rc TAWNY DAYLILY.

Established in several places.

Memranreiitana L.. le ee e INDIAN CUCUMBER-ROOT.

Rich moist woods.

@emeonatum biflorum (Walt.) Ell.................... SOLOMONS-SEAL.
Frequent in woods.

Memiiacina facemosa (L.) Desf............... FEATHER SOLOMON-PLUME.

Frequent in woods.

lee Sais yey Bsc es eee So ees ta ea nays SAWBRIER.

Thinly wooded areas or margins of woods.

SEE oe el COMMON GREENBRIER.

Frequent in woods and thickets.

MRIIECOOMAGA Lois cw eye ee et te pees Woop MERRYBELLS.

Common in woods.

ESET ES) re oc a ec rr LITTLE MERRYBELLS.

Occasional, location 25.

DIOSCOREACEAE

Ditoscorea, batatas. Denes. 8 ee ee CINNAMONVINE.
On fence in locations 9 and 23.

Dioscorea quaternata (Walt.) J. F. Gmel. (D. glauca Muhl.)
Frequent in woods and thickets.

Dioscorea: villosa: Dec ec ce alee ee ee eee ATLANTIC YAM.
Low woods and thickets.

AMARYLLIDACEAE

Hypoxis hirsuta.) ‘Coville... 23 2 ca COMMON GOLDSTARGRASS.

Frequent in woods and fields.

IRIDACEAE

Sisyrinchium angustifolium Mill.
(S2 seranemordes DICK. ))5 40.55/96 6 sn tle ae alee BLUE-EYED-GRASS.

Meadows and thin woods.

ORCHIDACEAE
Corallorrhiza odontorhiza (Willd.) Nutt.............. LATE CORALROOT.
Woods, occasional.
Cypripedium acaule: Ait. cise eae ay STEMLESS LADYSLIPPER.

Frequent and widely scattered.

Goodyera pubescens (Willd.) R. Br. .......... RATTLESNAKE-PLANTAIN.

A single plant seen on the south bank of ravine in location 19. Probably
more frequent before the leafmold was destroyed by fires.

Tiabenaria lacera (Michx. )) hoddu yoo). 2 clued ee ea RAGGED ORCHIS.
Wet soil of the holly-magnolia area, location 39.

Isotria verticillata (Willd, ) (Rati. 2. se ck ee see le WHORLED POGONIA.

Rare, found on north edge of Magnolia Swamp, locations 54 and 55, and
in the ravine of location 21.

Liparis lilifolia) (E,)\ Richa sie. cia sin si es hes cea eee TWAYBLADE.
Occasional. Widely separated patches in leafmold in woods.

Spiranthes gracilis (Bigel.) Beck............... SLENDER LADIES-TRESSES.
Conifer planting, location 52.

SAURURACEAE

Saututis Coronas: 826g Sk Le ss Le ee LIZARDTAIL.

Introduced on the north side of Beech Spring Pond, location 33.

14

SALICACEAE

Mapmus canescens (Ait.) J. E. Smith.................... GRAY POPLAR.
Mount Hamilton and Anacostia River front.
Semmemeerermiemides Matsh...... 2.2.2.0... eee eee COTTONWOOD.

Vicinity of pistol range, location 40.

ES SE a CRACK WILLOW.
Occasional in wet soil.

SUS ee PRAIRIE WILLOW.
Frequent in dry woods and fields.

SS BLACK WILLOW.

Low ground and along streams.

JUGLANDACEAE
Carya cordiformis (Wang.) K. Koch.............. BITTERNUT HICKORY.
Frequent in woods.
Carya tomentosa Nutt. (C. a/ba of authors)............... MOCKERNUT.
Common in woods.
nah oe sce a4 edie ae se ence new BLACK WALNUT.

Hickey Run valley and Mount Hamilton.

BETULACEAE

Alnus serrulata (Ait.) Willd. (A. rzgosa of most authors) ..HAZEL ALDER.
Common in wet soil and along streams.
SES Oe SWEET BIRCH.

Three plants below the Anacostia River overlook were planted but appear
as if native, location 47. Also three smaller plants were placed on the north
slope of Mount Hamilton, location 10.

ES ISS ES ee RIVER BIRCH.
Frequent in wet or moist soil.
Mummramiericatia Walt..... 2.2... .cs ee eee ete AMERICAN HAZEL.

Woods and riverbanks.

FAGACEAE
muemmten Centata (Marsh.) Botkh...................00eeen CHESTNUT.
Mostly killed by blight. Occasional small stump sprouts can be found.

iL Ga | a ALLEGHANY CHINQUAPIN.
Occasional in dry open woods.

Fagus grandifolia Ebrh. ....5c6 seen Wikies. ss ees oe ee BEECH.
Numerous fine old specimens.

Quercus albac Ene, ie es ee WHITE OAK.
Common in wooded areas.

X Quercus bernardiensis W. Wolf (Q. stellata X Q. prinus)
Occasional in woods.

X Quercus bushii Sarg. (Q. marilandica X Q. velutina)
Occasional where the two species grow together.

Quercus faleata Mich: 0 0). ea iinies ako eves pe SOUTHERN RED OAK.
Common in woods and fields.

Quercus marilandica Muenchh... 0.05.0... 0.0. a BLACKJACK OAK.
Frequent in dry woodlands.

Quercus palustris .Muenchh:. i075... eo. . ee PIN OAK.
Frequent.
Quercus plrellos Tits fai ciiis. be Fae ee chaste ee coo 4 2 eee WILLOW OAK.

Common everywhere, many handsome specimens.

Quercus prinus L. (Q. montana Willd.).......... SWAMP CHESTNUT OAK.
Common in dry soils.

Quercus subra Too e e.g ose ee ee ee RED OAK.
Occasional in woods.

X Quercus saulii Schneid. (Q. alba X Q. prinus)

Occasional in woods, as in ravine northeast of the gatehouse, locations 20
and 19.

Quercus stellata ‘Wane 2.2 oe sas oes oh a a eee POST OAK.
Frequent.
Quercus velutina: Lams) 772 ia ee ee ae ee BLACK OAK.

Common in wooded areas.

ULMACEAE
Celtis: occidentalis 1. ((C. vrasstfolza Lam.) .... cia ee sae HACKBERRY.
Occasional in woods.
Cilgs ainericatd eee ee is ace ha Se eee AMERICAN ELM.

Occasional in meadows and clearings.
MORACEAE

Homulus: japoatcus SichyhZuce.\. ss os a ee JAPANESE HOP.

Near outlet of Hickey Run, location 35, and in location 31.

16

Semrorarpomitera (Raf.) Schneid............6........+ OSAGE-ORANGE.

Site of Hickey Mansion, location 50, and near former Morris Place, loca-
tions 15 and 2.

TOI ek be ae we wes WHITE MULBERRY.
Common everywhere.
MIEN Se tec ce ee Obes euaacaaee RED MULBERRY.

Riverbank, ravines, and thickets.

URTICACEAE
Boehmeria cylindrica (L.) Sw................ SMALLSPIKE FALSENETTLE.
Along river and creeks.
EaEEE AM) ASTAY 5. le ce eee eee eee eee RICH WEED.
Common in rich moist soil.
Pemesprdcilis Ait............... PAPER RE ee ots beige SLIM NETTLE.

Occasional in cultivated ground.

SANTALACEAE

emanate winbellata (L.) Nutt..........0..7....... BASTARD TOADFLAX.

Frequent in dry open woods.
LORANTHACEAE
Phoradendron flavescens (Pursh) Nutt........... AMERICAN-MISTLETOE.
On a single tree of Nyssa sylvatica near Licking Banks Spring, location 53.

ARISTOLOCHIACEAE

Meeeemeiia setpefitatia L.................2....- VIRGINIA SNAKEROOT.

Occasional, widely scattered in open dry woods.

POLYGONACEAE
eemaatitolinm L................-..-. HALBERDLEAF TEARTHUMB.
Permanently wet soil.
memenmt avictilare Lo. eee PROSTRATE KNOTWEED,

Cultivated ground and waste places.

Semmens convolvulus L......... 2.6.2 ee eee eee DULLSEED CORNBIND.
Common in woods and thickets.

Polygonum cuspidatum Sieb. & Zucc........... JAPANESE FLEECEFLOWER.
Locations 1 and 2.

Serveonum lapathifolium L.................000- CURLTOP LADYSTHUMB.
Occasional in wet soil.

1

Polygonum pensylvanicum L................ PENNSYLVANIA SMARTWEED.

Common.

Polgaonum, petsicatiac Tai 5) ..5 8) wa on pie, see SPOTTED LADYSTHUMB.
Occasional in moist soil.
Polygonum punctatum: Elle sas iii ange. see DOTTED SMARTWEED.

Along watercourses.

Polysonum “sapittatam) Eo.) ooo ok oat ee ARROWLEAF TEARTHUMB.
Wet soil.
Rumex acetosella sis cis seater ena eee SHEEP SORREL.

Very common in fields and woods.

Rumex ceispusioid ae ec ean cae ae CURLY DOCK.
Fields and cultivated ground.

Rumex vobtustfolius Leo rk oe es Se eee BITTER DOCK.

Common in cultivated ground.

Povata virginiana (CL.): Ratairy Pk ee es eae VIRGINIA TOVARA.
Moist woods and thickets. |

CHENOPODIACEAE
Chenopodium: album. bis. 02 a. jog ate ak a ee LAMBSQUARTERS.
Common in cultivated ground.

Chenopodium ambrosioides L.................. WORMSEED GOOSEFOOT.
Common about buildings and fences.

Chenopodium, paganum Reichenb.)., 0... 2.0 62. s ae ae PIGWEED.

Occasional in open rich woods.

AMARANTHACEAE
Achida: cannabinal Hay7 ee. ie wie ho» vee» Sos oe Oe WATERHEMP.
Tidewater mud along river wall.

Amaranthus graecizans L. (A. blitoides S. Wats.)......... TUMBLEWEED.
Occasional in waste places.

Amaranthus hybrids Tsong) Were jet os le SLIM AMARANTH.
Common in cultivated ground.

PHYTOLACCACEAE

Phytolagca americana Tosi...) others +) .1s ee eee POKEWEED.
Common everywhere.

18

AIZOACEAE

CTE Eg CARPETWEED.
Common in cultivated ground.

PORTULACACEAE

SE RS SPRINGBEAUTY.
Common in moist woods.

CIM ELAGCED Vs. 2 ko eee ee eee COMMON PURSLANE.
Cultivated soil.

CARYOPHYLLACEAE

Agrostemma githago L....... stele ci AIA ROR eae CORNCOCKLE.
Sporadic in cultivated ground.

Mamastiarserpyliifolia L.................. 0000. THYMELEAF SANDWORT.

Cultivated ground.

Cerastium nutans Raf. (C. longepedunculatum

MUM cigs ee cs he toe eee MOUSE-EAR CHICKWEED.
Occasional in woods and fields.
Mm VISCOSUIN LL. ke ee STICKY CERASTIUM.
Common.
TI Se DEPTFORD PINK.

Meadows and lawns.

Paronychia fastigiata (Raf.) Fern.

(Anychia polygonoides Raf.)......... FORKED CHICKWEED, NAILWORT.

Frequent in woods and fields.

SS Se BOUNCING-BET.
Frequent near old building sites.

oe ss hea’ 5x viedo ia vn o)n's Wiyigye vine SLEEPY CATCHFLY.
Common in cultivated ground and waste places.

Meremroriatiana Walt... 06... icc cece cece ceneee PEATPINK SILENE.
Frequent on dry hillsides.

EE Ea STARRY CAMPION.
Wooded areas.

IE UR ee ee LITTLE STARWORT.
Margin of Beech Spring Pond, location 34.

Gemeenes enedia (L.) Cytillo. ss. c ccc cece eens COMMON CHICKWEED.

Common everywhere.

Stellaria pubera Miche 2 OER AO oy re eee GREAT STARWORT.

Rich woods.
RANUNCULACEAE
ANEMONE WitainiAnaL AY Meo ye dee le et ee VIRGINIA ANEMONE.
Occasional in woods.
Anemonella thalictroides (_:) Spach... 0.7.00 aa ANEMONELLA.

Rich open woods.

Clematis dioscoreifolia var. robusta (Carr) Rehd. (C. paniculata Thunb.)

Escape from cultivation; established in a few places.

Clematis -viraimtana: oo i06 is kil due inate 2 ee ee VIRGINS-BOWER.
Occasional in thickets.

Delohinmim wayacis iis, oR ake a ROCKET LARKSPUR.

Occasional in fields.

Hepatica americana (DC.) Ker......... WM lias ae a HEPATICA.

Occasional in woods.

Ranunculus, abottivus li: 8 ee ee wee LITTLELEAF BUTTERCUP.
Frequent.
Rasuncalus: bulbosassle oso si ee ea ie eee BULB BUTTERCUP.

Common in lawns and fields.

Ranunculus recurvatus Poir.

Frequent, especially on slopes of Mount Hamilton.

Ranunculus sceleratus L.

Muddy places.

Thalictrum dasycarpum Fisch. & Lall.............. PURPLE MEADOWRUE.

Moist soil, thickets, and riverbanks.

Thahictrum: polyeanmima Ii ye) fee ee cn 2s + 2 eee TALL MEADOWRUE.

Moist soil, not common.

Xanthorhiza simplicissima Marsh.................. SHRUB YELLOWROOT.
Spreading as if natural from azalea clumps introduced from North Carolina.

BERBERIDACEAE

Podophyllum .peltatuma Toi oa) iio, ea eee MAYAPPLE.

Forms large colonies in woods.

20

MAGNOLIACEAE

Liriodendron tulipifera L.....TULIPTREE, YELLOW-POPLAR, TULIP-POPLAR.

Common in woods.

ET rr SWEETBAY MAGNOLIA.
Swamp in northeastern corner of grounds, locations 54 and 55.

ANNONACEAE

ememmerinia (0. ) Dunal es ee eee i els PAWPAW.
Found only at the foot of the cryptomeria ravine near the river, location 46.

-LAURACEAE

Smeaton (L.) DlUMe. . 1). i. ee ce ee ee SPICEBUSH.

Wet soil in woods and along streams.

meemememeidum (Nutt.) Nees. ....... 2... seen ke eee SASSAFRAS.
Frequent in woods and fields. |

PAPAVERACEAE

Seeemeesemavila (Rat.) DC... 2... ec eee YELLOW CORYDALIS.
Occasional in rich woods, southeastern slope of Mount Hamilton.

eS REE Pera ay ee ase a Poppy.
Occasional along roadsides.

eemrrteeanadensis Lb... eee BLOODROOT.

Wooded areas; not common.

CAPPARIDACEAE

REIN IEC) 29) Soe sw nla ele ge oye toe en ws he as SPIDERFLOWER.
Near former Morris Place, at location 15.

CRUCIFERAE

I ere ee ne ede wbew piece on ame’ SICKLEPOD.
South slope of Mount Hamilton.
Macmasea vetna (Mill.) Aschers................... EARLY WINTERCRESS.

Common in fields.

Semmmmmnraa: Ta CD. Ca petass Le.) io. ee wok cule siege e's BIRD RAPE.
Occasional in waste places.
Capsella bursa-pastoris (L.) Medic...................SHEPHERDS-PURSE.
Common.
21

Cardamine parviflora var. arenicola (Britt.) O. E. Schulz... .BITTERCREss.
Frequent in woods and fields.

Dentaria laciniata: Muh. 0. 5.54 Js whe ae eke eee TOOTHWORT.
Wooded areas.

Detaba ‘verdad ie oic5) eh a nals ei mecehen woes WHITLOWGRASS, SPRING DRABA.

Frequent in cultivated soil.

Lepridsum, campestee (1L.)) Re BES cy 20 «eet ees FIELD PEPPERWEED.
Common in fields.

Lépidiuay ‘viretmicum Pee 6 2b hee ee _.. VIRGINIA PEPPERWEED.
Common everywhere.

Rorippa islandica var. fernaldiana Butt. & Abbe?.......... YELLOWCRESS.
Wet soil.

Sisymbriam officinale ((L.) ‘Scap..3. 0.030. ee. oo ee HEDGEMUSTARD.

Common in cultivated soil.

Sisymbrium thalianum (L.) J. Gay........... PRS ee,. MOUSE-EAR CRESS.
Abundant. One of our best examples of a winter annual.

SAXIFRAGACEAE
Heuchera americana’ 1.2. 0 00 heey ee ae ALUMROOT.
Shaded banks.
Saxiftaca virginiensis: Michx.s. 0). 02°. Dae ce ee VIRGINIA SAXIFRAGE.

Open hillsides and thin woods.

HAMAMELIDACEAE

Hamamelis virginiana Dee le ee OR chee aie WHITCH-HAZEL.
Scattered through woods.

PLATANACEAE
Platanus: occidentalis Tet pear ens ie! late va e op PLANETREE, SYCAMORE.
Low ground along streams.
ROSACEAE

APTIMMOIIA: | PALVENUAE GE, AM ae vier ose eo nen) Aaa ane: +a aS alates eae AGRIMONY.
Meadows and thickets.
Agrimonia rostellata Wallr.

Occasional in woods.

2A plant that appears to be Rorippa sinuata (Nutt.) Hitchc. has become established
in the nursery beds west of the greenhouses, location 18.

22

Amelanchier canadensis (L.) Medic..JUNEBERRY, SERVICEBERRY, SHADBLOW.
Woods. Several trees to 25 feet noted.

Seetseous pruinosa (Wendl:) K. Koch.................... HAWTHORN.
From Mount Hamilton eastward.

Duchesnea indica (Andr.) Focke.............. INDIA MOCK-STRAWBERRY.

A few feet beyond the fence where Hickey Run leaves the grounds, loca-
tion 35.

mememarmi@einiana. Duchesne............... 6.60 e eee. STRAWBERRY.

Frequent in woods and fields.

eam witeimianum L. (G. birszium Muhl.).................... AVENS.
Dry woods. |

Poreatina canadensis L. (P. pumila Poir.)..............%.) CINQUEFOIL.
Fields.

Potentilla norvegica L. (P. monspeliensis L.)
Roadsides and fields.

Potentilla recta L.
Cultivated fields and meadows.

Potentilla simplex Michx. (P. canadensis of authors, not Linnaeus)
OLDFIELD CINQUEFOIL.
Fields and roadsides.

Summmmmcamericatia Matsh..........2..000ce rece ecues AMERICAN PLUM.
Hickey Run valley.
Ms aneusttOlia Marsh...............:.-..000e0- CHICKASAW PLUM.

Near Holly Spring, location 38, and in thickets. Forms dense colonies from
spreading roots.

a Tein ee PEACH.
Waste places and refuse dumps.

NS 2 BLACK CHERRY.
Common in woods and fields.

Pyrus arbutifolia (L.) L. f. (Aronia arbutifolia (L.) Ell.) .RED CHOKEBERRY.
Moist thickets east of Hickey Run.

II lic cs iy cle agi die ele eee ese ns vines COMMON PEAR.
Occasional in fields and woods.

Pyrus coronaria L. (Malus coronaria (L.) Mill.) .. WILD SWEET CRABAPPLE.

Southwest slope of Mount Hamilton extending eastward to hills above
the river.

erent , CMS PUMA T..) 6 i ec ee ge ean enin: APPLE.

Occasional.

23

Pyrus melanocarpa (Michx.) Willd. (Aronia melanocarpa

CMitciox. Va ys sic eb ter, Sos eae eee eee eae ee BLACK CHOKEBERRY.
Thickets.
Rosa carolina L. (R. humilis Marsh. in part.)............ CAROLINA ROSE.
Dry banks.
Rosa eglanterta L.. (Ki rabiginosa T.) 6s a. a ee SWEETBRIER.

Old fence rows and thickets.

Rosa ‘viroiniana Milli. 0 cgi. be ea oe oe eee ee VIRGINIA ROSE.
Swampy places.

Rubus. arcutus Bioko jic1/. 2h nee aa eee HIGHBRUSH BLACKBERRY.
Old fields and fence rows.

Rubus argutus X R. flagellaris
Found in Magnolia Swamp only, locations 54 and 55.

Rubus canetfolias Pursh. 2.5 25.170. tee ene SAND BLACKBERRY.
Rare in poor dry soil.

Rubus flagelaris Willd. (R. procumbens of the 1919 ‘Flora of the District
of Columbia.”’)

Fields and roadsides.

Hubs! iris pidusi di.) 3.4 ue, ale d= seen eee Beas Cee SWAMP BLACKBERRY.

Introduced into native azalea garden with collected plants.

Rubus: occidentalis Lao oe ee eee eee BLACK RASPBERRY.
Old fields and thickets.
Rubus phoenicolasius: Maxim... 020.60 uve ys ta ee WHINEBERRY.

Southwest base of Mount Hamilton.

LEGUMINOSAE

Amiphicarpa bracteata: (Us) (Peta... 5 0 is. es an oe HOGPEANUT.

Woods. Cleistogamous flowers, developed at the end of slender leafless
branches, produce single-seeded pods in the soil or leafmold.

Amphicarpa bracteata var. comosa (L.) Fern. (A. pitcheri T. & G.)
PITCHERS HOGPEANUT.

Moist soil along watercourses or swamp margins.
Apios americana. Medic (0/55 he 5 x 2 ney tae POTATOBEAN GROUNDNUT.
Wet soil along river and streams.

Baptisia: tinctonia (E:)) (Be, Big fie ida is «utes ek Bie eae WILD-INDIGO.
Dry hillsides.

3 Both species and variety frequently grow together and hybridize freely, giving rise
to many intermediate forms that have confused botanists for many years.

24

Memeeraeeiewiata Michx.... 2.5... 00.0 ces nur vccacecceccs PARTRIDGEPEA.
Open woods and fields.

IMEICPICANIS Fao ne eee SENSITIVE PARTRIDGEPEA.
Open woods and fields.

Cassia nictitans var. hebecarpa Fern. (C. marilandica of authors, not Linnaeus)
Low ground along Hickey Run.

AEE ah Wes ie) aa oie Sox's ea v cies hee sy eee eee REDBUD.
A single plant that was destroyed in 1948 to make way for new construction.

Oe ATLANTIC PIGEONWINGS.
Frequent on dry hillsides.

SISTA S ee ee ec ee ee ee eae RATTLEBOX.
Occasional in dry fields and waste places.

Desmodium ciliare (Muhl.) DC. (D. obtusum (Muhl.) DC.) .TickcLover.
Open dry ground.

Desmodium laevigatum (Nutt.) DC.

Riverbanks and rich woods.

Desmodium laevigatum X D. viridiflorum

Frequent where the two species grow together. This is an excellent example
of natural hybridization.

Desmodium marilandicum (L.) DC.

Open ground.

Desmodium nudiflorum (L.) DC.
Frequent in woods.

Desmodium paniculatum (L.) DC.
Woods and thickets.
Desmodium perplexum Schub.
A variable species, probably of hybrid origin. Thin woods and open ground.

Desmodium rotundifolium DC.
Dry wooded hillsides.

Desmodium viridiflorum (L.) DC............. VELVETLEAF TICKCLOVER.

Common in dry open woods.

NIELS C85, ) SUM bores od id's x 6 ave g's on ck dy & vide gies MILKPEA.
Occasional in dry fields and banks.

EERE OMMRIS Foci J. ly nye Nac inid rea) letard)s BG cle Ho acna wiess EVERLASTING PEA.
Escape from cultivation in the vicinity of old building sites.

25

Lespedeza:capitata, Miche. so). We cil ane ROUNDHEAD LESPEDEZA.
Found in location 13 and in adjoining areas only.

Lespedeza cuneata (Dumont) G. Don
Occasional in fields, but likely to become abundant.

Lespedeza hirta (L.) Hornem.
Frequent in open woods.

Lespedeza procumbens Michx.
Dry fields and open woods.

Lespedeza repens (L.) Bart.
Roadsides and open woods.

Lespedeza:stipulacea Maxim... 02252. 2his'4 4. eee KOREAN LESPEDEZA.
Common along roads and in fields.

Lespedeza striata (Thunb.) H. & A................ JAPANESE LESPEDEZA.
Lawns, fields, and roadsides.

Lespedeza virginica (L.) Britt.
Meadows and margins of woods.

Medicago: Iupulina Doi .t)0cucn Wee oso an ult oe eee BLACK MEDIC.
Roadsides and cultivated ground.

Medicaro sativa Uo. oc Sh eccee te de Fn a el ALFALFA.
Occasional in meadows. |

Meltlotus: alba Dest icc Shak wed Ustad ni aya tina WHITE SWEETCLOVER.
Along roads and in waste places.

Melilotus officinalis CL.) Lam....\4.. 0. 26a ee YELLOW SWEETCLOVER.
Roadsides and waste places.

Phaseolus: polystachios (L.) UBS.P.. 0020), a ee THICKET BEAN.
Mount Hamilton, location 8.

Robinia; pseudoacacia is, ee ii eres ellen eo) ae» OP ee BLACK LOCUST.
Common in woods, fields, and thickets.

Strophostyles' helvota: (U.) Bi ios. eee eee eee WILDBEAN.
Occasional in open places.

Strophostyles umbellata (Muhl.) Britt.
Frequent in open dry soil.

Stylosamthes, bidlora (1) BSP oc: vie PENCILFLOWER.
Frequent in dry soil.

Tepheosia: virgudiana (1.,) Pets... icc des os 08 at nee GOATSRUE.
Frequent in dry open woods.

ET Cn RABBITSFOOT CLOVER.
Common in fields.

SO ALSIKE CLOVER.
Fields and roadsides.

IMTS Ls Oo ayia ise concede beste ce ee teenies RED CLOVER.
Common in fields and waste places.

Mumm rOCcuUmpENS 1... ce lee Low HOP CLOVER.
Fields and waste places.

a nee ee WHITE CLOVER.
Lawns, fields, and roadsides.

Seeteeaneustitolia Reichard...................05. NARROWLEAF VETCH.
Woods and fields.

Mummmmrmrmeriitiitana Walt.......... 00. 0laccceec vecevas CAROLINA VETCH.

Occasional in woods.

a ES a HAIRY VETCH.
Occasional in fields.

LINACEAE

Seren) (Planch,) Britt.............5 0... c eens YELLOW FLAX.
Open woods.

Linum striatum Walt.
Occasional in open moist soil.

OXALIDACEAE
Oxalis europaea forma cymosa (Small) Wieg.............. WoopsorREL.
Frequent in open ground.

Oxalis filipes Small
Woods, fields, and thickets.

Oxalis stricta L.
Frequent in disturbed soil.

aw bw ase VIOLET WOODSORREL.
Frequent in woods.

GERANIACEAE

Geranium carolinianum L.
Common in fields.

27

Geranium. maculatum | TL... .. ose ee eee SPOTTED GERANIUM.

Occasional in rich woods.

SIMAROUBACEAE

Ailanthus altissima (Mill.) Swingle........ AILANTHUS, TREE-OF-HEAVEN.
Frequent in woods and thickets.

POLYGALACEAE

Polygala sanguinea L. (P.. viridescens L,) . 0 2.5..5 ho BLOOD POLYGALA.
Frequent in dry open ground.

EUPHORBIACEAE
Acalypha oracilens Gray 0) once ne See SLENDER COPPERLEAF.
Cultivated ground.

Acalypha rhomboidea Raf. (A. virginica of authors, not Linnaeus)
Disturbed soil.

Euphorbia Gorollata Lo .¢ See en ee FLOWERINGSPURGE.
Woods and fields.
Euphorbia, ipecacuaniaae 1..>). Soa. pert ns os ae IPECAC EUPHORBIA.

Pistol range ridge, locations 42 and 41 only.
Euphorbia maculata L. (E. preslzi Guss.)
Frequent in open ground.

Euphorbia supina Raf. (E. maculata of authors, not Linnaeus)
SPOTTED SPURGE.

Common.
ANACARDIACEAE

bas, copallaiaa tae. ts ceed Bete sade ee oes ee FLAMELEAF SUMAC.
Thickets and margins of fields.

BAUS lara kU en etal tise, rs dye na te ea eae SMOOTH SUMAC.
Fields and thickets.
Rhwe’ facteang, Fe ee eek el das eee POISON-IVY.

Common everywhere.
Baltes: Cy Pela Pcs eas Poe nine cisie ue), sear STAGHORN SUMAC.
Occasional in fields and woods.

Rivas Were 2 ug his Zo ee oe ee POISON-SUMAC.

Magnolia Swamp in northeastern part of grounds, locations 55 and 56 only.
Formerly there was a single large plant in a springy place near the summit of
Mount Hamilton, east side, above the azaleas.

28

AQUIFOLIACEAE
NE ok ae le Ave cee AMERICAN HOLLY.
Occasional in woods.
Memewenmettiata (L.) Gray................. WINTERBERRY, BLACK ALDER.

Occasional in wet soil. A staminate plant is growing naturally in the holly-
magnolia area, location 41.

CELASTRACEAE

Memeesermeseanedens 1... ee ee AMERICAN BITTERSWEET.
iIMount Hamilton and other wooded areas.
Summertmeseamericatus pt... . ee BROOK EUONYMUS.

Woods and ravines.

EAMES a HEDGE MAPLE.

Numerous plants along the southwest base of Mount Hamilton, location 2.
Seeds apparently originated in Mount Olivet Cemetery across Bladensburg
Road.

IT se dered wes ele bow eae ee ale BOXELDER.
Frequent.
NEM er ee he ek able wes RED MAPLE.

Woods, fields, and along watercourses. Begins to bloom about 2 weeks later
than A. saccharinum.

a SILVER MAPLE.

Frequent in low ground. Some trees have been known to flower during the
last few days of January in mild winters.

BALSAMINACEAE
Impatiens capensis Meerb. (1. bzflora Walt.) ....SPOTTED TOUCH-ME-NOT.
Wet and moist soils.
RHAMNACEAE
meanotmus americanus L.............. JERSEY-TEA, CEANOTHUS, REDROOT.
Occasional in woods.
VITACEAE
Parthenocissus quinquefolia (L.) Planch.............. VIRGINIA-CREEPER.
Woods and thickets.
ST a SUMMER GRAPE.

Frequent in woods and thickets.

29

Vids labrusea Dik bic. Vos EAR, FOX GRAPE.
Swamps and watercourses.

Vitis vulpina L. (V’. cordifolia Michx,)........).1.. ose FROST GRAPE.
Occasional on banks and in woods.

TILIACEAE

Tilia neglecta Spach (T. americana of the 1919 “Flora of the District of —

Columbiag ji tab pakteuuac tee omen ae WHITE or QUEBEC BASSWOOD.
Hickey Run valley.

MALVACEAE

Abutilon theophrasti Medic............ CHINGMA ABUTILON, PIEMARKER.
Common in cultivated ground.

Hibiscus moscheutos L. (H. palustris of the 1919 “Flora of the District of
Columbia.” not Lianaeus) ..24/.. 2. ee COMMON ROSEMALLOW.

Margin of streams and in swamps.

Hibisens. syriacus ils). ie de tk ae aN ce SHRUB-ALTHEA.
Established near old dwelling sites, location 17.

Hibiscus triomumy Tye oy awa Wile ee ees as eee FLOWER-OF-AN-HOUR.

Occasional in cultivated soil.

Malva neglecta Wallr. (M. rotundifolia of authors, not Linnaeus)
RUNNING MALLOW.

Occasional in waste places.
Sida ‘SPUMOSA Tis hen slp ckevwyareie ties ehh itasencla) een PRICKLY SIDA.
Cultivated soil.

Ascyrum ‘hypericoides W252 0. Ss he Eee St.-ANDREWS-CROSS.
Common in woods and fields.

Hypericum: canadense “Le. 2 seni nce cei +s > op ovseeee ST.-JOHNS-WORT.
Occasional in roadside ditches.
Hypericum denticulatum Walt................ COPPERY ST.-JOHNS-WORT.

Frequent in moist soil.

Hypericum gentianoides (L.) B.S.P.
(Sarothra gentianoides Ie)... 3.) sds he dae ORANGE PINEWEED.

Frequent in poor thin soils.

Hypericum mutilum L.
Wet soil especially near water.

30

Beeeericum perforatum L.................... COMMON ST.-JOHNS-WORT.

Occasional in fields.

Hypericum spathulatum (Spach) Steud. (H. prolificum of American
RE ee SHRUBBY ST.-JOHNS-WoORT.

Occasional along roadsides.

Hypericum virginicum L. (Triadenum virginicum (L.) Raf.)
MarsH ST.-JOHNS-WORT.

~ Occasional in wet soil.

CISTACEAE
Helianthemum canadense (L.) Michx.............. CANADA FROSTWORT.
Dry hillsides.

Lechea leggettii Britt. & Hollick.
Occasional in dry soil.

Lechea racemulosa Michx.
Rare in dry soil.

VIOLACEAE
ummmetoritiata (INutt.) LeConte..:..................02-..- VIOLET.
Occasional in rich woods.
Viola fimbriatula Sm.
Dry fields and banks.
Viola kitaibeliana var. rafinesquii (Greene) Fern...... JOHNNY-JUMP-UP.

Fields and other open ground.

Viola palmata L. (V. stoneana of the 1919 ‘‘Flora of the District of Colum-
bia.’’)
Mount Hamilton and other wooded areas.

Viola papilionacea Pursh
Common everywhere.

ES A BIRDSFOOT VIOLET.
Occasional in dry soil.

Viola primulifolia L.
Magnolia Swamp only, location 55.

EE ee ARROWLEAF VIOLET.
Fields and thin woods.

Viola triloba Schwein.
Woods.

31

PASSIFLORACEAE

Passifiora’ lutea, ee Pe yc a ee ee PASSIONFLOWER.
South and east slopes of Mount Hamilton.

LYTHRACEAE

Cuphea pettolata ‘(L.). (Nochae.n.. 0 3.0 ...5 0020 eee CLAMMY CUPHEA.
Frequent in cultivated ground. ;

NYSSACEAE
Nyssa sylvatica Marsh............ BLACKGUM, SOURGUM, BLACK TUPELO.
Frequent in woods.
ONAGRACEAE

Circaea quadrisulcata var. canadensis (L.) Hara.. ENCHANTERS-NIGHTSHADE.

Frequent in woods.

Gaura biennis L.

Rare in cultivated soil and along roadsides.

Ludwigia alternifolia var. typica Munz....................... SEEDBOX.
Wet soil.

Ludwigia palustris var. americana (DC.) Fern. & Grisc. (Isnardia palustris
DES) ee ecisee WU Daala eo taks Regents Clos Poe aca te ante ean MARSH PURSLANE.
Margin of ponds.

Oenothera-biennts La og ee OL eee EVENING-PRIMROSE.

Common everywhere.

Ocnothera fruticosa. Taos ee ae ee eee SUNDROPS.
Open ground.

Oenothera laciniata Hill

Frequent in cultivated soil.

ARALIACEAE
PUEANE A, TGA CANIS To 05 i: w oe ia sw ies ln ola 9. wae oe ei WILD SARSAPARILLA.
Woods and banks.
Attalita: Spiess Ta cies nisi pts So 2 DEVILS-WALKINGSTICK, HERCULESCLUB.

Northwest slope of Mount Hamilton.

Hedera Hee 22 25 aioe a woe Le B05 sie we ee eee ENGLISH IVY.
Southeast slope of Mount Hamilton.

a4

UMBELLIFERAE
Angelica venenosa (Greenway) Fern. (A. villosa (Walt.) B.S.P., not
sake ews inde eb a he the slee Raa yee ae ANGELICA.
Occasional in woods.
Chaerophyllum procumbens (L.) Crantz
Occasional in wet soil.

ST 2 SPOTTED WATERHEMLOCK.

~ Wet soil.

Seeemeemarcanacensis (L..) DC...... 02.52... eee eee. HONEWORT.
Moist soil.

es Me ee ee WILD CARROT.

Common everywhere.

Mupmenriavcanadensis L...............-.-cccccccaece BLACK SNAKEROOT.
Woods.

Taenidia integerrima (L.) Drude

Occasional in dry woods.

ummemecra.) W..D. }. Koch...............-5. GOLDEN ALEXANDERS.

Occasional in open woods.

CORNACEAE
eee amomum Mill..............6.....-4- SILKY DOGWOOD, CORNEL.

Frequent in woods and along watercourses.

ES a FLOWERING DOGWOOD.

Common in woods.

ERICACEAE
Senapnila maculata (L.) Pursh..............+.... STRIPED PIPSISSEWA.
Woods.
SS TRAILING-ARBUTUS, MAYFLOWER.
Frequent on wooded banks.
Meeunetia procumbens L................. CHECKERBERRY WINTERGREEN.

Naturalized near Red Oak Spring, location 48.

Gaylussacia baccata (Wang.) K. Koch............. BLACK HUCKLEBERRY.

Dry thin woods.

mumemsssacia trondosa (L.) T. & G....... 2.2... c ee ceenes DANGLEBERRY.
Dry woods.

33

Kalmia latifolia Lo i -s0.s SCs Pee eae eee MOUNTAIN-LAUREL.
Frequent in dry open woods.

Leucothoe racemosa (L.) Gray (Exbotrys racemosa (L.) Nutt.) . FETTERBUSH.
Dry woods and slopes.

Lyonia ligustrina (L.) DC. (Xolisma ligustrina (L.) Britt.) .. MALEBERRY.
Frequent in moist woods.

Lyonia mariana (L.) D. Don (Neopieris mariana (L.) Britt.) _ STAGGERBUSH.
Dry ridges.

Monotropa uniflora Ls.) cid. . ee.. INDIAN-PIPE.
Frequent in woods.

Rhododendron nudiflorum (L.) Torr.
PINXTERBLOOM AZALEA, ‘“HONEYSUCKLE.”

Woodlands and clearings.

Vaccinium atrococcum (Gray) Heller............... DOWNY BLUEBERRY.
Woods and thickets.

Vaccinium atrococcum xX V. vacillans

Shrub about 3 feet. Frequent where the two species grow together. This
hybrid was verified by making crosses artificially and growing the seedlings
to maturity.

Vaccinium stamineum L. (Polycodium stamineum (L.) Greene) . DEERBERRY.

Common in dry woods.

Vaccintum ‘vacillans Tort: / 2.330} he ee. BLUERIDGE BLUEBERRY.

Well drained woods and on slopes.

PRIMULACEAE

Anapallis ‘arvensis (bo: 25h se): Gevemedie steer os conte SCARLET PIMPERNEL.
Cultivated or other disturbed soil.

Liysitiachia. Clint ee en ees os als AE 4. FRINGED STEIRONEMA.
Woods and fields.
Lysimiachta’ aamutiutlarta ae. i. Cireein a os 4 esa gees MONEYWORT.

Near old dwelling sites.

Lysimaeliia quasititolia ee) ois seid © onset io FOURLEAF LOOSESTRIFE.
Woods and fields.

Diospyros virginiana L............... did Sek ial ee PERSIMMON.
Woods and fields.

OLEACEAE

MEE WACOIMICUS Tc ce De eee eees FRINGETREE.
Frequent in woods.

MNIIUTOTICAMA Te cc tc tee dace cine wea biaes WHITE ASH.
Occasional throughout the area.

Fraxinus mecosyivanica Matsh.........-....-.....- teen Nae ve RED ASH.

Frequent in low ground.

cia sieht ase ep eet ese ees COMMON LILAC.
Common around old building sites.

GENTIANACEAE
muerte aueularis (L.) Pursh................ SQUARESTEM ROSEGENTIAN.
Occasional in fields.
APOCYNACEAE

Apocynum cannabinum var. pubescens (Mitchell) A. DC...HEMP DOGBANE.
Fields and woods.

se a einai eee as COMMON PERIWINKLE.
Southeast corner of grounds, location 22.

ASCLEPIADACEAE

Ampelamus albidus (Nutt.) Britt. (Gonolobus laevis of authors) . HONEYVINE.
Southern edges of locations 3 and 4.

_ Asclepias amplexicaulis Sm.
Occasional in woods.

Asclepias incarnata var. pulchra (Ehrh.)............. SWAMP MILKWEED.
Occasion2l in moist or wet soil.

Sumemmmrputascetis L,..............--.052 2s eens PURPLE MILKWEED.
Occasional on east slope of Mount Hamilton.

EE ee COMMON MILKWEED.
Frequent in fields.

ON Ly os eheea y's b fipisle a ev ole anne eee wales BUTTERFLYWEED.
Occasional in dry fields.

SEM IDIIMOLG RAT. eis ee et eee ee eee GREEN MILKWEED.
Common in dry fields.

CONVOLVULACEAE

Convolvulus: arvensis) Ti. Uy eRe eee EUROPEAN BINDWEED.
Common in sandy areas.

Convolvulus: sepiunr yi. 35.000 ocak heme HEDGE BINDWEED.
Common in cultivated soil.

Cuscuta eranovin Willd) ere sete ea pee DODDER, LOVEVINE.
Frequent in low places. .

Cuscuta pentagona Engelm. (C. arvensis Beyrich).............. DODDER.
Fields and waste places.

Ipomoes) coccinea, Wer ae ash eet pone ae ee RED MORNING-GLORY.
Occasional in waste places.

Ipomoea hederacea (L.) Jacq.
Frequent in cultivated soil.

Ipomoea lacunosa L.

Waste places.

Ipomoea pandurata (L.) G. F. W. Mey........ BIGROOT MORNING-GLORY.
Fields and dry banks.
Ipomoea purpurea (L.) Roth................ COMMON MORNING-GLORY.

Cultivated soil.
POLEMONIACEAE

Phioxpaniculatatl.. 5534 sec weak sj oats os eee PERENNIAL PHLOX.

Occasional; escape from cultivation.

BORAGINACEAE

Echimny vyulpare sl. b cy ee tee VIPERSBUGLOSS, BLUEWEED.
Occasional in disturbed soil.

Lichospermum varvense E500 0.00) ie: oe ae ean CORN GROMWELL.
Common in fields and waste places.

Myosotis verna Nutt. (M. virginica (L.) B.S.P.)........FORGET-ME-NOT.
Common in disturbed soil.

VERBENACEAE

Verbens thastata. le ed od eA eee BLUE VERBENA.
Low open ground, not common.
Vetheaawerticitolia-1 2. oo. eos eee cbc. ches eS ae WHITE VERBENA.

Open ground and thin woods.

LABIATAE

Mea CANAGENSIS LL... ww ee cc eee HoORSEBALM.
Rich woods.
Sumida Ofieanoides (L.) Britt:.......:.......... MARYLAND STONEMINT.

Frequent on dry hillsides.

Merecnomia hederacea L.:......-........0c0000ce GILL-OVER-THE-GROUND.

Frequent, often forming a dense ground cover.

Hedeoma pulegioides (L.) Pers.......... AMERICAN FALSE-PENNYROYAL.
Woods, fields, and roadsides.
Lamium amplexicaule L....... SR eae g AC REM olde ti setts Ay O8ccs HENBIT.

Common in disturbed soil.

Sem EDUTeUM F.. e PURPLE DEADNETTLE.
Waste places, occasional.

PIPE ATCUS Foo ee eee eae VIRGINIA BUGLEWEED.
Frequent in wet or moist soil.

Mentha arvensis var. villosa (Benth.) S. R. Stewart (M. canadensis

Occasional in moist soil.

Eee a epee die ise leleiele ed wea be Eee ds SPEARMINT.
Vicinity of old dwelling sites.

PEE Do ews ee ee ele ees SPOTTED BEEBALM.
Sandy soil in location 36.

Perilla frutescens var. crispa (Benth.) Deane (P. frutescens of the 1919
Seeman ine District of Columbia.”)....................+ PERILLA.

Southwest corner of the grounds near Bladensburg Road, location 2.

eae coh wy pcg e sin hg DR Es vk eee es SELFHEAL.
Common everywhere.

Pycnanthemum flexuosum (Walt.) B.S.P.............. MOUNTAIN-MINT.
Frequent in woods and meadows.

Pycnanthemum incanum (L.) Michx.
Rare, found in northeast corner of grounds, location 54.

TE LYRE-LEAVED SAGE.
Common in open ground and thin woods.

Satureja vulgaris var. neogaea Fern. (Clinopodium vulgare L.) .WILD BASIL.
Woods and thickets.

Scutellaria elliptica Muhl. (S. ovalifolia Pers.)......... HAIRY SKULLCAP.

Frequent in woods.

37

Scutellaria integrifolia L.
Frequent in woods and on banks.

ocutellaria latertflora’ Lic. 25 os et ees Fs ee MAD-DOG SKULLCAP.
Rare, found in wet soil near river wall, in northeastern part of location 40.

Triehostema dichotomum ‘1, i...) 0.605 cl ee ee BLUECURLS.
Occasional in thin woods and in fields.

SOLANACEAE

Datura sttamontuma Lio. see ea ee JIMSONWEED.

Cultivated ground and waste places.

Lycium halimifolium Mill.................. COMMON MATRIMONY-VINE.
Vicinity of old building sites,

Physalis heterophylla Nees... 03...) fhe to aa ee GROUNDCHERRY.
Mount Hamilton and other wooded slopes.

Physalis virginiana Mill.
South bank of Heart Pond, location 29, and probably elsewhere.

Solanum carolinense: Li. vee a eee HORSENETTLE.
Common.
Solanum: dulcamara Lc be ee ce ee BITTER NIGHTSHADE.

Occasional in cultivated soil and in thickets.

Solanum nigrum ] SEES OU HRD LIL RATNER Li. M.S) & BLACK NIGHTSHADE.
Common.
SCROPHULARIACEAE
Chelowe glabrathe ike) Pak es NN, ae TURTLEHEAD.

Frequent along watercourses.

Gerardia pedicularia L. (Avreolaria pedicularia (L.) Raf.)...... GERARDIA.
About 50 feet beyond fence, location 57.

Gerardia tenuifolia Vahl (Agalinis tenuifolia (Vahl) Raf.)... _GERARDIA.

Occasional in dry soil.

Gerardia virginica (L.) B.S.P. (Aureolaria villosa
CIVERSI le) al eae we eae ills ad Bt a ae Re DOWNY FALSE FOXGLOVE.

Frequent in woods.

Linaria catiadensis, CL.) Dumont, i... .0s) ens OLDFIELD TOADFLAX.
Common in sandy soil.
Linania (vale ania Ta soit getty deve 2 Gye aoe ene BUTTER-AND-EGGS.

Occasional in waste places.

38

Lindernia anagallidea (Michx.) Pennell (l/ysanthes attenuata of the 1919
peroravon the District of Columbia.”)............. FALSE-PIMPERNEL.

Occasional in muddy soil.

SLE MONKEY-FLOWER.
Occasional in wet soil.

Paulownia tomentosa (Thunb.) Steud................... EMPRESS TREE.
Frequent in woods and fields.

Seeman laevicatus Ait............0...6- 502 e eee SMOOTH PENSTEMON.
Occasional in meadows.

Verbascum blattaria L......... Se Ree US OEE RR MOTH MULLEIN.
Clearings and in cultivated soil.

MEP ASUS DL. ee ee FLANNEL MULLEIN.
Disturbed soil in woods and fields.

i COMMON SPEEDWELL.
Cultivated soil and waste places.

TS er DRUG SPEEDWELL.
Woods and banks.
Betertind LL... ee eee PURSLANE SPEEDWELL.

Cultivated soil.

Memeieaeserpyllitolia L...........-.......4-- THYMELEAF SPEEDWELL.
Occasional in woods and fields.

BIGNONIACEAE
Campsis radicans (L:) Seem. (Bignonia radicans L.) ... . TRUMPETCREEPER.
Woods and thickets.
Sepa menontoides Walt................-..-.... SOUTHERN CATALPA,

Established on the west slope of Mount Hamilton.

MumemectOsa Warder... ............ 0 cece NORTHERN CATALPA.
Location 17 and adjoining areas.

OROBANCHACEAE
Epifagus virginiana (L.) Bart. (Leptamnium virginianum (L.) Raf.)
BEECHDROPS.
Frequent under beeches.
ACANTHACEAE
mum cargumensis CWalt,) Steud............ 0.000 eva weeeas RUELLIA.

Occasional in thin woods.

39

PHRYMACEAE

Phryma leptostachya: ‘Loud 4.) Ge er LOPSEED.
Woods and thickets.

PLANTAGINACEAE
Plantago ‘atistata \Michx.. 22...) So0y - oe. BOTTLEBRUSH INDIANWHEAT.
Cultivated ground. |
Planteoo lanceolata: Losi ire mea Gee ee BUCKHORN PLANTAIN.
Common everywhere.
Plantaso migjor [eo ook wa dati ve en fa ae ee RIPPLESEED PLANTAIN.

Occasional in waste ground. Location 14 and vicinity.

Plantago rugelii Decaisne

Common.

Plantago virginica L.
Cultivated ground and other disturbed soil.

RUBIACEAE
Cephalanthus ‘occidentalis Lo. <2 cable Gace eee .... BUTTONBUSH.
Wet soil along watercourses and swamp margins.
Diodia teres: Walt): 2.0. i.e Bans Se eie Oe eee BUTTONWEED.
Cultivated soil and waste places.
Diodia virginiana L.

Common around Beech Spring Pond, location 32, and between greenhouses,
location 18. Unknown at the Aboretum previous to the summer of 1945.

Galion, aparine oie ising oe sees eve CATCHWEED BEDSTRAW, CLEAVERS.
Frequent in fields and woods.

Galtnia citcaevans WWichy.. 33 xcs er el ee WILD LICORICE.
Woods.

Galium pilosum Ait.

Frequent in woods and fields.

Galiam’ tinctoriom L(G: ‘claytoni Michx.).... 2° 022% DYE BEDSTRAW.
Frequent in wet soil.

Galan teiflonsay Miche! 4 ee eee SWEETSCENTED BEDSTRAW.

Frequent in rich open woods.
Houstonia caerulea L. (Hedyotis caerulea (L.) Hook.).......... BLUETS.

Open woods and fields.

40

Houstonia purpurea L. (Hedyotis purpurea (L.) T. & G.)
Woods and thickets.

ERE a PARTRIDGEBERRY.
Occasional in woods.

CAPRIFOLIACEAE
Meera sapomica Thunb..................... JAPANESE HONEYSUCKLE.
Common everywhere.
Serra SCMpervirens L..............22..665- TRUMPET HONEYSUCKLE.

South slope of Mount Earilian and elsewhere in woods and on banks.
Rarely flowers because of aphis injury.

ES a COMMON ELDER.
Field margins and in thickets.

Triosteum angustifolium L.....NARROWLEAF HORSEGENTIAN, FEVERWORT.
Along north edge of former Morris Place in locations 15 and 16.

mmmtnum aceritolium L.................... ces. MAPLELEAF VIBURNUM.
Frequent in woods.

ICS TO ce eet ele eee WITHEROD.
Wet soil on slope opposite the Cryptomeria planting in location 45.

memmmeimny Gentatum L............ 0c ce we cc ee SOUTHERN ARROWWOOD.

Frequent in woods and along watercourses.
TO a ee BLACKHAW.

Woods and thickets.

CUCURBITACEAE

ee BUR-CUCUMBER.

Occasional in thickets along watercourses.

CAMPANULACEAE
I ae a vies eee ccaay INDIAN TOBACCO.
Frequent in disturbed soil.

Lobelia puberula Michx.
Rare, found on southeast slope near the base of Mount Hamilton.

Specularia perfoliata (L.) A. DC. (Triodanis perfoliata (L.) Nieuwl.)
VENUS LOOKINGGLASS.

Common in woods and in cultivated soil.

41

COMPOSITAE

Achillea: millefolitam, Ta...) 6.6 650 ii sie eed eee oe YARROW.
Common everywhere.

Ambrosia artemisiifolia var. elatior (L.) Descourtils..COMMON RAGWEED.
Common.

Ambrosia -teifida Peis. jie isa 4) pie ae aries ee GIANT RAGWEED. |
Cultivated soil and low ground along streams.

Antennaria, aeelecta. "Greene. 5). eee FIELD PUSSYTOES.
Open woods and fields. |

Antennaria parlinii var. arnoglossa (Greene) Fern......... EVERLASTING.
Occasional on wooded hillsides.

Antennaria plantaginifolia (L.) Hook.
Woods.

Arithemis ‘arvensis: liso inibiat ao ate cane oe Uae FIELD CAMOMILE.
Occasional in fields.

Accttum minus: (Hill) sBeraler seer er nar. vs eae COMMON BURDOCK.
Cultivated soil and waste places.

Artemisia, annua Lic fica Os ere BN ee ee WoORMWOOD.
Occasional in fields and waste places.

Actemisia velloarige Tone 8) 5 abet 2 Ole on sie a ete COMMON MUGWORT.
Brought in with nursery stock and widely scattered.

Aster divaticatus Ws. sis. so isos Hateare whe aif eed des en Err ASTER.
Woods.

Aster lateriflorus (L.) Britt.
Moist fields and woods.

Aster patens Ait.
Wooded slopes.

Aster pilosus Willd.
Open woods and fields.

Aster puniceus L.
Swampy places.

Aster simplex var. ramosissimus (T. & G.) Crong. (A. paniculatus Lam.)
Woods and fields.

Baccharis halimifolia L..........5.0.5 44: EASTERN BACCHARIS, SEA MYRTLE.
A single plant near the boundary line, location 24.

42

SIG Ta iat ee ie veel eee eee ge cues SPANISH-NEEDLES.
Common.

ne eee BEGGARTICKS.
Damp woods and fields.

Cacalia atriplicifolia L. (Mesadenia atriplicifolia (L.) Raf.)
PALE INDIAN-PLANTAIN.

Occasional in woods.
SET IICEA Do ce eee eee teens SKELETONWEED.

Occasional in dry soil.

Chrysanthemum leucantemum var. pinnatifidum Lecog. & Lamotte.
OXEYE-DAISY.

Fields and meadows.

Seemeaematiana (L.) Ell... kk ee ee cee GOLDEN-ASTER.
Frequent in woods and on dry banks.

Eienottum intybus L............. Re e362) INL Ide be CHICORY.
Cultivated and waste ground.

Mummmmrmetine (1) SCOP... 52)... eel tee cee CANADA THISTLE.
In temporary nursery area of location 27.

Cirsium discolor (Muhl.) Spreng.
Common in disturbed soil.

Cirsium PEEP SAVE) CHOLES i. eke ae ieeid see es eieiele = = BULLTHISTLE.
Frequent in waste places.

MIME Ts. i oe ce le ee cee pe he LANCE COREOPSIS.
Escape from cultivation; established in several places.

Coreopsis major Walt.
Several plants in native azalea garden in location 5.

Coreopsis verticillata L.

Dry open woods.

Eclipta alba (L.) Hassk.
Occasional in moist soil.

miepnantopus carolinianus Willd...................... ELEPHANTSFOOT.
Frequent in woods.

Sememites hieracifolia (L.) Raf..............00000. AMERICAN FIREWEED.
Common in disturbed soil and in burned-over places.

EST ORY DE) | ¢- ANNUAL FLEABANE.

Common everywhere.

Erigeron canadensis DL. .:....06 ink heh ae HORSEWEED.
Common.
Erigeron pusillus Nutt.

Common in nurseries, on sandy point near Hickey Run outlet, location 36,
and in field east of R Street, location 26.

Erigeron strigosus Muhl. (E£. ramosus (Walt.) B.S.P.)...DAtsy FLEABANE.

Common,

Eupatortum album LL...) .. 3 ees ee oe ee ee ee EUPATORIUM. —
Thin woods and fields.

Eupatortom \coelestinum) Ly. 5 :je. -uincis 2. > son ea eee MISTFLOWER.

Low ground and along watercourses.

Eupatorium hyssopifolium L.
Frequent in meadows.

Eupatorium hyssopifolium var. laciniatum Gray (E. torreyanum Short)
Common in fields.

Eupatorium perfoliatum L....: 0.6.0... 00200... 5 BONESET.
Frequent in fields and thickets.

Eupatorium pilosum Walt. (E. verbenaefolium Michx.)
Dry open woods.

Eupatorium pubescens Muhl.
Fields and woods.

Eupatortum: purpureum Lo. oe oes jae) nino eo i ee JOE-PYE-WEED.
Meadows and thickets.

Eupatorium rotundifolium L.
Thin dry woods.

Eupatorium rugosum Houtt. (E. articaefolium Reich.) . . WHITE SNAKEROOT.
Frequent in woods.

Eupatorium serotinum Michx.
Rare, found in edge of woods in location 51.

Galinsoga ciliata (Raf.) Blake (G. parviflora var. hispida DC.)
Common. |

Gaaphalium obtusifolium L..:...:...5..5.\... 0008, SWEET EVERLASTING.
Woods and fields.
Gaaphaliam ‘purpureum: Dis. 25 hs ee PURPLE CUDWEED.

Common in disturbed soil.

Helentuim) nudifioram Nutt.i 6 335. ce ae ae SNEEZEWEED.
Occasional in fields.

MIMEMRECLIVALICATUS L.. ceeeeeeee eens SUNFLOWER.
Frequent in woods.

Helianthus tuberosus L....................005. JERUSALEM-ARTICHOKE.
Low grounds and thickets.
q
a HAWKWEED.
Occasional in fields and open woods.

Muemietatium yenosum J........................ POORROBINS HAWKWEED.
Common in woods.

j Hypochoeris radicata L......... aortas eieearethy oy Chae etn ee ahs ye, Pe CATS-EAR.
Occasional in lawns.

Krigia biflora (Walt.) Blake (Cynthia virginica (L.) D. Don)

Location 6.

Krigia dandelion (L.) Nutt.

Occasional in woods.

Suemroimica (I) Willd.........3......-.0.--5- DWaARF-DANDELION.
_ Frequent in woods and fields, especially in disturbed soils.

_ Lactuca biennis (Moench.) Fern. (L. spicata sensu Hitchc.) . WILD LETTUCE.
Fields and waste places.

7 Lactuca canadensis L. (L. sagittifolia Ell.)
Cultivated soil and waste places.

- Lactuca ‘floridana (L.) Gaertn.
Woods and fields.

- Lactuca floridana var. villosa (Jacq.) Cronq.
Woods and thickets.

ES WILLOWLEAF LETTUCE.
Occasional in dry fields, location 49.
RE PRICKLY LETTUCE.

Waste places.

~ Liatris graminifolia (Walt.) Willd............. GRASSLEAF GAYFEATHER.
Frequent in dry soil.

Memmadia sativa Molina................. 2c eee e eee e eee eee aees TARWEED.
Occasional in cultivated or disturbed soil.

_ Mikania scandens Re tinge le a ww 5 wl bse CLIMBING HEMPWEED.

Wet soil along river margin and in other swampy places. A climbing plant
with fragrant flowers.

45

Prenamthes: alsa [ey i435 ce oc as eA ee RATTLESNAKE-ROOT.

Frequent in woods.

Prenanthes setpentaria Putsh.),... 4.00.25. 4.) *\: LIONS-FOOT,

Occasional in woods and thickets.

Rucdheckia laciniata Le. cece ee eee ee WILD GOLDENGLOW.

Frequent in fields and thickets.

Rudbeckia serotina Nutt. (R. irta of most authors)... BLACK-EYED-SUSAN,

Occasional in old fields.

Senecio ‘smallit Britt.) . i... o3. 0. ok ee ee RAGWORT.

Occasional in fields.

Senecio yulearis Ne. ccs. oiot ake tahoe a eek shal eee COMMON GROUNDSEL.

Southeastern slope of Mount Hamilton, location 11.

Sericocarpus asteroides (L.) B.S.P................ WHITE-TOPPED ASTER.

Woods and fields.

Silphium crifoliatumy Eo. y. 040 b\.4 2 3-510 cee ROSINWEED.

Thickets and margin of woods.

Solidasovaltissima (L.. 032)... Seni eee Ree he eee GOLDENROD.

Margin of woods and thickets.

Solange IDicolot Vi. 33 c/a cis inc meoletyce oe ae eee SILVER GOLDENROD.

Wooded hillsides and riverbanks.
Solidago erecta Pursh
Open dty ground.
Solidago graminifolia (L.) Salisb.
Fields and thickets.

SOMiaeo jiacea A Ihe sant: os ayeiets «sash Meat atte gle PLUME GOLDENROD.
Old fields and meadows.

Solidago nemoralis Ait.
Frequent in dry soil.

Solidago odora Ait. (S. suaveolens Schoepf.)......... SWEET GOLDENROD.

Frequent in dry woods. The entire plant when crushed emits an odor
similar to anise.

Solidago rugosa Ait.
Thickets and margin of woods.

Solidago ulmifolia Muhl.
Moist woods.

RE ES FIELD SOWTHISTLE.
Near greenhouses, location 18.

SE Se COMMON SOWTHISTLE.
Common in cultivated ground.

Taraxacum erythrospermum Andrz. (T. /aevigatum
MUMIPGMIEOIS) ee eas SMOOTH DANDELION.

Common everywhere.

Taraxacum officinale Weber (Leontodon taraxacum L.)
COMMON DANDELION.
Common.

ewercma occigentalis (L.) Walt:........).6....00..04.. CROW NBEARD.
Meadows and thickets.

Memmemmrmreianed (1.) Willd. ie ek ee ee ee IRONWEED.
Margin of woods and in fields.

Vernonia noveboracensis (L.) Michx.
Woeds and meadows.

Xanthium italicum Moretti (X. saccharatum sensu Widder, X. commune of
the 1919 “Flora of the District of Columbia,” in part) ...COCKLEBUR.

Cultivated ground and waste places.

47

INDEX TO FAMILIES

Page Page
PCaMtRACEAS) a ie)s - aloe mane wnat ail es 39) Leguminosae... s+. os eee 24
PVEBTACCDO an 5 5 a's Gmscuate ex MMOS 29 | Liliaceae isixisistu/aels Actes ee
PIZORCEIS A palars aietiswies ante are Se uma oe 19] Linaceae” . . . . 5 «js:sjeu0 emp ee 27 |
Alismataceaey aa oa Sl Ags Coens 5 | Loranthacede’ i 1.2 ae se 17
Amaranthacese \y2 4/3). che wile eiute ee ae 18 | Lycopodiaceae .....0.2 05 sw a en es |
Heyl sieets ala dernlcha''e tenes Me ig’ e dies 14} Lythraceae \: 2s ay. eh eee iar wens 52 a
Anacatdiacede «2. |. Weis bhovs io eee 28 .
AniiGnacerey (db srniave et sle a ooers mice 21 on 8 a |
APOCYMACEACY 1 wie latte ale biota baci ae 35 Mo VaCeae ies esse 16
Marist QHACETS Alec REPS lami wu a ake 29 OLEACEAE «+ 0 its sein se
PEACE AS cigs sat We a cays Shon ha ake ean eee 12] Niyssacede 4 wis: «ice mses pte 32
APaMtaCeae: Veer ie bse ree ees le ate apa valaieine 32 |
Aristolochiatede | |)s 4 Ph gee ely ae eases Ly Oleacene + ++4 ol ies
Asclepiadaceae 35 Onagraceae .......-++- PPM eo - 52
RRP AIL LCS OU GR Ophioglossaceaeé s «.«,s\./6 o/s sieleiierenniene 3
Balsaminacere it Hoes eee eee 29 | Orchidaceae...) fan ote aN Nese 14
Bethertamcene. hea ae ee GO aa 20:| Orobanchacéae « .°..:'./¢ ss 6 ae 39
Hetulacere iss etd AMS be Bn eee 15 | Osmundaceae |... 0.5 0c) See 3
Bisnoniaceae sinh a slain ees oe ee 39 | Oxalidaceae *. .: <.<'s:s ew eietsyeleieneeaeene 27
BOracinacede ae 5 000) As felis wheres wear anr 36 Papaveraceae ../.+..ck ee 1
Campanulacere ys i040 yas ube 41} Passifloraceae .i2.'.'. ow « oleate 32
CappatidaGede. erste sicchet tes cioueiais Sus 21° |\Phrymacede: '.,. . si0e «5 sven ieee 40
Capritoliacede iii) s2 clan st. tie eae eee 41 | Phytolaccaceae. 2... \s 2.5 <tr siete ene 18
Caryophyltlaceaes. 2.2 ioe. Ban ae eee 19| Pimaceae oy oS 220 ae 4
Galastracead. ss Weak Oo ce lini 29 | Plantaginaceae «2...» «.%:sis eee 40
Chenopodiaceae o.oo 2G ates sce es ng | Platamacede (:. . +s. sv 02 see ee 22
Gistageaes AAS, SE ee es 31.) Polemoniaceae!’ 22.2: ciate 36
Conmmelinagene: o). oils cee a we ee 12 | Polygalaceae .........-+-2++ene-e 28
Composiiaee hs ar Mote sh NO ae 4>\ Polygonaceae/... +. 2:0 es Gee 17
Convolvulacere i.) fo sce a wei ee 36 | Polypodiaceae .. <<. «=e é
Cornacenet ts. oo alae a ae ae 33 | Pontederiaceae, _... .. \ 3 eee 12
Cramer here ies alain ners tukarnyatacs whe 21 | Portulacaceae ............+--22--- 19
Gurcutbiticede ily fora.) oy cela wee 41 | Peimulaceae . . e540. 2s = 0 ee 34
Cyperaceae -- 11sec eee eee eee 10) Ranunculaceae... +. «+ sss Soe 20
DiOscoreacede 871d. se. he een eee 14 | Rhamnaceae ....- 2. 50» «ene 29
ROSaCede’ sss sis 0 Ses 22
ee LT ae ere ae ne eater ees Rage Ee 34 Rubiaceae... ..s.+++«+ act 40
UIISCEACEAC! ln. ceca foie amu e faraire-wilematele ae 3
BrtcHcedel (yas ata aie iter el ne shoe 33'| Salicatede: 20.) eo ss ale o> en 15
Buphorbiseeae «!o oc hiateas hbo ne 29 Santalacesze 2.65... «00s > ce 17
Papaceae 15 SaMruraceae . . .asa ee » ss ee Se 14
RR MEMe EAI RG hom ite iene Saxifrapdcede .. «ssa» ss.00\s seer
Gentianacede ) ines eee res ves 95) ( Sctophulariaceae.. ... 4): s/c eee 38
Geriniaceae so aie¢ ek Lie sees e 27 | Stmatoubacede . 0.65.6 ss 10 28
Graminene) Soc t Re oe ee ok § | Solanaceae .... <<’ see's sn ene 38
(SUHBECRAe, a ike ved baaeicteen eae ae 30) Spareamiacese . oc s's 0 tp See 5
Fiameamelidacese oo. ice eee. Bx WV UdaACeae P< vivi'e) s 4 00s 4.600 a ws ae 30
Pivdrocharitageaaen 2/046 eh mut Si) byphaceae «2%. sou diateis knee 4
ic fs 2 arce ae ey ee MRS RAE NTE OMS, 5 CMUD 14 | Ulmaceae ........ 00.2 seen eee eees 16
Umbelliferae’ sos sess oe oss ee a5
Vugbardaceae 30). + s'¢ Ain vin e's oes eae 15 | Usticaceae: oii y iccd ost aw ee 17
WUMAGAC EOE i css Aes ere hea le hal ete cira tes 12 Wevehathae a 36
VAMATOE sd oid a lala Rio aud avaie ene els Tt WAtACEAE |e iesc See taieda etn eemeye eats eee 29
Lautareaai 2 sha ak twee adda ae oh QE Violacene: . isin Sac aioe av iesee eee 31

yy U. S. GOVERNMENT PRINTING OFFICE: 1953 — 256497

48

WUNLLN
3 9088 01528 7444