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Annotated List
ot the Plants
Growing Naturally at

the National Arboretum

OLIVER M: FREEMAN

National Arboretum
Contribution No, 1

August 1953

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

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

National 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

.
x
AAR

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.

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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

Bamisetmpanvenses Ll... 0s... ie eg oie eee oh ee 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.

Botrychium virginianum (L.) Sw................... RATTLESNAKEFERN.
Frequent in thin woods.

Opmioslessum vuleatum L.:. 2... le ADDERSTONGUE.

Rare, not found in recent years.

OSMUNDACEAE
Wsawacarcrnmamomea Lo: i... ee eee CINNAMONFERN.
Frequent in wet soil. Conspicuous on steep banks that are springy.

Wsmundarclaytoniana UL... ee ee INTERRUPTED-FERN.
Steep bank near river, location 46.

Osmunda regalis var. spectabilis (Willd.) Gray............. ROYALFERN.

Rare, found in wet soil.

POLYPODIACEAE

Asplentum ‘platyneuron’((1.) Oakes: 3) 2 252 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 soveboracensis (1) Gray 2). 8. NEw YORK FERN.

Frequent in moist woods and low ground.

Onoclea-sensibilis ei ie ek ee ee eee 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, rigida) Mallinson oe cree aah ee ae ee PITCH PINE.
Hickey Hill and vicinity, location 43.

Pinus virciniana, Milli. 0) os ee eee VIRGINIA PINE.

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

TYPHACEAE
Typha ‘anoustifolia 1 iccssi ccc ere NARROWLEAF CATTAIL.
River margin near pistol range, location 40.

‘Typha latifolia Uo 3.80 eo oe. Se eee COMMON CATTAIL.
Margin of ponds and along edge of river.

4

SPARGANIACEAE
Sparoagium americanum) Nutts. 3. 0-2... 6.5.2. BURREED.
Wet soil.
Sparganium eurycarpum Engelm.
Wet soil, mostly along river.

ALISMATACEAE

mlismaysubcordatum, Raf. i465. es iene eee kes WATER PLANTAIN.
Margin of ponds and in swampy places.

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

Sapittaria latifolia Willd... 0... 0.0.5. cece cece eee COMMON ARROWHEAD.
Margin of river and ponds.

HYDROCHARITACEAE

Plodeamcamadensts sMiIChx. 2 5. ke oko lee cle ee bene wate el ELODEA.
The two ponds near Hickey Run, locations 30 and 32.

GRAMINEAE

meropyronerepens::(1:.) Beauv.... 2.0... 0..5 05. b eee eee QUACKGRASS.
Common in open ground.

Agrostis alba L. (A. palustris of the 1919 “Flora of the
PIS EEICU RG UMC OMIM DIAL) 6 5.5 5 Sh eckie ares rete sesleva's oles wenle's'e ohe's REDTOP.

Common in fields.

moxostiswitemalis .( Walt.) B.S.P..... 0.6.6. e ee e oes 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

Districtrot. Columbia.” ) 2.0.66 lcs ce ee RHODE ISLAND BENT.
Grasslands.
PE ABEAL VOI WCQ) MG 518 0015 05 sos aioe oi 0) lela eS sigs Sores eye de ele ss HAIRGRASS,

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

Andropogon elliottii Chapm......:................ ELLIOTT BLUESTEM.
Occasional in sterile, open ground.

Andropogon scoparius Michx....................... LITTLE BLUESTEM.
Dry fields and open woods.

Andropogon \virginicus eee ice tee ee ee BROOMSEDGE.
Common in fields and open woods.

Anthoxanthum) odorcatummulae 32. 4 eee SWEET VERNALGRASS.
Common everywhere.

Aristida dichotoma Michxy. 2.3.44. ..2 6 oe 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)Schtadso.. 200. Je eee HAIRY BROMEGRASS.
Frequent in waste ground. |

Cinnasarundinacea ch wicg 6 ait Gasca le Ce nee STOUT WOODREED.

Moist woods.

Cynodon dactylon (L.) Pers.
(Caprioladaciylom: (ea) NIZE eee BERMUDA GRASS.

Lawns, roadsides, and waste places.

Dactylis elomerata 1a. ooh eer «eee ee ley ORCHARDGRASS.
Near Heart Pond, location 30.

Danthoniayspicata (E>) Beauv. eee eee ee POVERTY OATGRASS.
Poor ground in woods.

Deschampsia flexuosa (L.) Trin... WAVY HAIRGRASS, CRINKLED HAIRGRASS.

Occasional in dry soil.

Dicitariavhilaformis (C))(Koeli2 227 se. eee SLENDER CRABGRASS.

Frequent in open ground.

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

Digitaria sanguinalis (L.) Scop.................... COMMON CRABGRASS.

Common in lawns and waste ground.

Echinochloa; crusgalli (L.)) Beauvie 52 eee BARNYARDGRASS.

Common in disturbed ground.

Eleusine “indica? (E)) Gaertn. vee eee eee GOOSEGRASS.
Common along paths and in fields.

By eas ev AG Onn GUS Msi hardy avail ei afer cele) ae. * eye le lle\- VIRGINIA WILDRYE.
Thin woods and open ground.

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

ET ACTOStSH Cap illanisy is) HUINCES 35.0 6 cr .ye oils Gap aya ais so ovelorny aim ie LACEGRASS.
Summit of Mount Hamilton, location 7.

Eragrostis megastachya (Koel.) Link (E. c7lzanensis 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.

Glyceria striata’ (Lam.) Hitch...) 6... be ete ee 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.

Molwumyperenne LE... 2... 53... COMMON DARNEL, PERENNIAL RYEGRASS.
Meadows.
WielicmamuticacW alts. 6. sole vee ele ee Ue: TWOFLOWER MELIC.

Foot of cryptomeria ravine near the river, location 47.

Miscanthusrsinensis Anderss.... i ee ee EULALIA.
Escape from cultivation, occasional. |

Muhtenberpiaischreberi J. F.Gmel.... 2... 2. NIMBLEWILL.
Frequent in disturbed ground.

Pamicuimpanceps -MiIchx. <0). 2) oe nla e eg chee wit oie Ss 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.

Paspalum laeve Michx.
Open ground.

Paspalum laeve var. pilosum Scribn.

Rare in moist ground.

Paspalum setaceum Michx.

Rare in open poor soil.

Ebert PL ACOMSE Mle dleygs cies fos sia, Jeo Se ei Syne Gheis ea COMMON TIMOTHY.
Frequent in fields and meadows.

|2IT A DAVAO, AR ek ae ene Nc Oe eS ANNUAL BLUEGRASS.
Common.
BOAMCOMMSECSS Anlst Fie) 285) 5 5 ois sPoiela cr wee aiele Soars nM ies CANADA BLUEGRASS.

Common in poor soils.

Poa cuspidata Nutt.
Open woods, occasional.

ESAMBDEALCOSISE Nes oi. Sones ein Gave weed bd See KENTUCKY BLUEGRASS.
‘Common in grasslands.

Baamerivialiggus. cps. 6 ane fas ble ceie sc bots ROUGHSTALK BLUEGRASS.

Occasional along watercourses and in location 1.

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

Common everywhere.

Sorehastcumpnutans (L.) Nash................0%. 0203. 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.

SHAM ANCRACEAR S22 cio ens 8 eee oe ee BLACKSEED NEEDLEGRASS.
Frequent in woods.

Triodia flava (L.) Smyth (Tridens flavus (L.) Hitchc.)...... PURPLETOP.

Common in open ground.

iReipsacume cdactyloides Lo... i ee EASTERN GAMAGRASS.
Fields, especially in low places.

Reiter taps aK ately) CB Soba ead teae cisietece arte rg 6 ea nae gyi SPIKEGRASS.

Sandy soil near river.

Zizania aquatica L. (Z. palustris of the 1919 “Flora of the
Districe of. Columbia). oe 2 oe oe ae 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.
(GC. grisea of most authors, not Wahlenbi)e . 20.2222 oe 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.
Sr MeLUSMeSEMeMeUS. Li. iS ci oe oie vie whe es 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.

Scirpus americanus, Pers. 62% cere eee 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
COLOD) Gk erica Aes Mer ie Oe ete) Seer ene JACK-IN-THE-PULPIT.

Frequent in rich moist woods.

Peltandra vireinica.(.)i Schottyoa endl a) ae ewe ee oe ARROW-ARUM.
Muddy places, especially along river.

Symplocarpus foetidus GL) Nutt 2 pee ee SKUNKCABBAGE.
Wet spring hillsides and low wet ground.

COMMELINACEAE

Comme\)lina communis iss es aren Oe ee ep ee DAYFLOWER.
Rich woods, especially the east slope of Mount Hamilton, location 8.

PONTEDERIACEAE

Pontedetia icordata We a ee a es ee PICKERELWEED.

Margin of river in tidal mud.

JUNCACEAE

Juncus acuminatus. Michxi 24.6 USo eee eee 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
aM DROOTR, WIV SE AG AR eles eat a ane RO IRS eee aU Pe PN ee FIELD GARLIC.
Fields and lawns everywhere.
SParasusrOmCimMalts De ek ee ee GARDEN ASPARAGUS.
Fields and waste places.
Erythronium americanum Ker................. YELLOW ADDERSTONGUE.

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

FACIMEROGAINS CHI Vale Eo OO Mme Strats TAWNY DAYLILY.

Established in several places.

Medeolatwanpiniana Lily: 6 ee ee es INDIAN CUCUMBER-ROOT.

Rich moist woods.

Polygonatum biflorum (Walt.) Ell.................... SOLOMONS-SEAL.

Frequent in woods.

Smilacina racemosa (L.) Desf............... FEATHER SOLOMON-PLUME.

Frequent in woods.

SUPUUUES SBN O VEIN TIERS eit as na ele ENN Prt PR SAWBRIER.

Thinly wooded areas or margins of woods.

Smilax rotundifolia: Lio. ss ee ee COMMON GREENBRIER.

Frequent in woods and thickets.

Uvularia perfoliata 1 eh cha URN GINd ey a SES AA AC eR Mara LTRS Woop MERRYBELLS.

Common in woods.

Wiymlartassessilitolia Lisi. hoc ee oles dbo be oon LITTLE MERRYBELLS.

Occasional, location 25.

10)

DIOSCOREACEAE

Dioscorea® batatas: Danes. 2c: oe ee eee CINNAMONVINE.

On fence in locations 9 and 23.

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

Dioscorea: villosa hos 2.5 bo ee ee ee ATLANTIC YAM.
Low woods and thickets.

AMARYLLIDACEAE

Hypoxis hirsuta’ (E_). ‘Coville... 02-2 = COMMON GOLDSTARGRASS.
Frequent in woods and fields.

IRIDACEAE

Sisyrinchium angustifolium Mill.
(S. graminoides Dick): 52 22522 sae ane eee BLUE-EYED-GRASS.

Meadows and thin woods.

ORCHIDACEAE
Corallorrhiza odontorhiza (Willd.) Nutt.............. LATE CORALROOT.
Woods, occasional.
Cypripedium sacaule: Att. 200 23 a a 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.

Habenatta lacera-(Michz:) ‘Lodd: (9225050 a ee RAGGED ORCHIS.
Wet soil of the holly-magnolia area, location 39.
Isotria verticillata (Willd:) Raficos 35222 ees ee WHORLED POGONIA.

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

Liparis: lilifolia; CL.) “Richard |) 5). 6 Get ee ee ee TWAYBLADE.
Occasional. Widely separated patches in leafmold in woods.

Spiranthes gracilis (Bigel.) Beck............... SLENDER LADIES-TRESSES.
Conifer planting, location 52.
SAURURACEAE
Saurutes) cermuus jLoh 0 p).s 2245 be ee Se ee LIZARDTAIL.

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

14

SALICACEAE

Fopulus canescens ((Ait,) J. E. Smith.j 0... 5.0. .052...5--- GRAY POPLAR.
Mount Hamilton and Anacostia River front.

Hopulusvaeltoiaes: Marsh.) 0c. oe ie heee Jene es ee COTTONWOOD.
Vicinity of pistol range, location 40.

SOURS TRC DC dU ECE A Be A an ee vA aS CRACK WILLOW.
Occasional in wet soil.

SVAPESCRRIPMINT ANS MICAS Ey ss oo Begs wre! ener ele ee wtichay Se iolay ea PRAIRIE WILLOW.
Frequent in dry woods and fields.

SM MOAMIITO EAM IVIATS IS 2 5 cf.c2's. Gus! 8/6 5 aici o va) elas ie) seer srecapeoale San oe 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.
TOSLRTS “nT 2 SS NO GA BLACK WALNUT.

Hickey Run valley and Mount Hamilton.

BETULACEAE

Alnus serrulata (Ait.) Willd. (A. rugosa of most authors) ..HAZEL ALDER.
Common in wet soil and along streams.
ERIE: ETN LSC ORS a A Ra es aes AP ae re 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.

RMPeH AMMDE LEARNS et ac oo) 5 ke) -F 1s he'd ols era lies ididlal Cal wel SV ade waa RIVER BIRCH.
Frequent in wet or moist soil.
Gorylusjamericana Walt....¢.........- yee HO ae Wee AMERICAN HAZEL.

Woods and riverbanks.

FAGACEAE
Gastaneaydentata (Marsh.) Bortkh...................0.655.-. CHESTNUT.
Mostly killed by blight. Occasional small stump sprouts can be found.

Mastanea-pumila (L.) Mill... 2... eS. . ALLEGHANY CHINQUAPIN.

Occasional in dry open woods.

Fagus ‘grandifolia: Ehrhis.) oc hee hears nas ete een ere eee BEECH.
Numerous fine old specimens.

Quetcus.albaylece vie sce ee ane Ser ee ar Wren Vr NES 6 WHITE OAK.
Common in wooded areas.

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

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

Quercus ‘falcata: Michs: 4-0 roe re ae SOUTHERN RED OAK.
Common in woods and fields.

Quercus matilandica /Muenchh een Ae eer BLACKJACK OAK.
Frequent in dry woodlands.

Quercus, palustris! Muench biz. se gS ote eer ine eee PIN OAK.
Frequent.
Quercus: pheblos Te... Sie eek) Week aaah eek as yeh ye nana WILLOW OAK.

Common everywhere, many handsome specimens.

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

Quercus rubra (ee eid Me elas eae ee eee RED OAK.
Occasional in woods.

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

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

Quercus, stellata Wangs .2 cay. 5 7st eee Ste iene) Ale ie ae POST OAK.
Frequent. |
Quercus ‘velutina Mamie cer ion re ee eee ee ee BLACK OAK.

Common in wooded areas.

ULMACEAE
Celtis ‘occidentalis 3 (G. crassifolia ams) ere ee HACKBERRY.
Occasional in woods.
Wimus -ameticanavl) 2 ee ee eee eee AMERICAN ELM.

Occasional in meadows and clearings.
MORACEAE

Efunwlus japonicus Sich. 562 Zucey.. =a ae eee ee JAPANESE HOP.

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

16

Maclurayponiutera (Rat ))ySchneid). 2. | 25-1) eee sie OSAGE-ORANGE.

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

VLG CI Sera by ateele ee ines iy tose Sh le a WHITE MULBERRY.
Common everywhere.
1S) ROY EOTES? YoU Bye be") Ll V1 SOU er ato Ue ROE aE PER RT RED MULBERRY.

Riverbank, ravines, and thickets.

URTICACEAE
Boehmeriacylindrica (L.) Sw.. 2... ..).5.. 5; SMALLSPIKE FALSENETTLE.
Along river and creeks.
Petbcimpatlen el aia(lss) n GTAY rie ors Shia: Se yeyiap mA chaye! toler Starch oi eieluic ot ein RICH WEED.
Common in rich moist soil.
Urtica gracilis Ait...... ED Ser acest oe Mura retatiee Ney are « Shakes SLIM NETTLE.

Occasional in cultivated ground.

SANTALACEAE

Comandrajumbellata (L.) Nutt...:.....2.....0055.. 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

Etistolociiamserpentaria Li. 2 3... ise ee es se VIRGINIA SNAKEROOT.

Occasional, widely scattered in open dry woods.

POLYGONACEAE
Bonsonumparifolium L... 62... ee HALBERDLEAF TEARTHUMB.
Permanently wet soil.
Boigonumeaviculate 1.0. iii oe ee ee he PROSTRATE KNOTWEED.

Cultivated ground and waste places.

Eowconum convolvulus TL... 6s i. ee DULLSEED CORNBIND.
Common in woods and thickets.

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

Polygonum lapathifolium L..................... CURLTOP LADYSTHUMB.

Occasional in wet soil.

/,

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

Common.

Polyeonim persicatia, #05) e oh tomes cee ee SPOTTED LADYSTHUMB.

Occasional in moist soil.

Polyconum punctatamBliets 73 422 42 ee DOTTED SMARTWEED.

Along watercourses.

Polyconumsacittatim Ee). be 22 ee ee ARROWLEAF TEARTHUMB.
Wet soil.
Rumex. acetosellac Ti .,5 30 sete Oe eae ee See SHEEP SORREL.

Very common in fields and woods.

Rumex crispus | IRS Ces (oe? re ARE ee yh sb eth os. CURLY DOCK.

Fields and cultivated ground.

Rumex obtusitolias Tes el eee ee BITTER DOCK.

Common in cultivated ground.

Tovata. virginiana (CU) CRat fs oe oe cea eee VIRGINIA TOVARA.
Moist woods and thickets.

CHENOPODIACEAE
Chenopodium -albuny $262 ee a ee ee LAMBSQUARTERS.
Common in cultivated ground.

Chenopodium ambrosioides L.................-. WORMSEED GOOSEFOOT.

Common about buildings and fences.

Chenopodium. pacanum Reicheabs: 3 sa03 0c te eee PIGWEED.

Occasional in open rich woods.

AMARANTHACEAE
Acnida scannabina Es) dion aos oe ee WATERHEMP.
Tidewater mud along river wall.

Amaranthus graecizans L. (A. blitoides S. Wats.)......... TUMBLEWEED.

Occasional in waste places.

Amaranthus *hybridus: Ei.c.2 0 080 2) 4M oa ey eee SLIM AMARANTH.
Common in cultivated ground.

PHYTOLACCACEAE

Phytolacca americana lest 2s ae ee a ee POKEWEED.
Common everywhere.

18

AIZOACEAE

ji WolUa rego ere Corl UE Ce st Dla a) age ea CARPETWEED.

Common in cultivated ground.

PORTULACACEAE

PEL atta ay aVAT ORCA ME ots. a orale, eleileele ote. 4) bie oie wile tafe ave Hist. SPRINGBEAUTY.
Common in moist woods.

Beretalacaioleracea bw. )s.4 sie ks) sya cate ee Sera ee COMMON PURSLANE.
Cultivated soil.

CARYOPHYLLACEAE
metostemmacetthaco Wo... we i te ea tle bee eles s CORNCOCKLE.
Sporadic in cultivated ground.
mrenatianserpyilsfolia To... bee cs ee ee THYMELEAF SANDWORT.

Cultivated ground.

Cerastium nutans Raf. (C. longepedunculatum

GHMEAMLENOES seer yea lela nN en NT el MOUSE-EAR CHICKWEED.
Occasional in woods and fields.
SC ELASCIUIMMMVASCOSUIM DE... kg ee Lk le ee as STICKY CERASTIUM.
Common.
Dyiarreuswabtimesia@ lh hk oe) Se le OS ek wus eee DEPTFORD PINK.

Meadows and lawns.

Paronychia fastigiata (Raf.) Fern.

(Anychia polygonoides Raf.)......... FORKED CHICKWEED, NAILWORT.
Frequent in woods and fields.
SAP OMATIABOMICIMAMNS Te i. sols res eon iso te cee ee eels oe BOUNCING-BET.

Frequent near old building sites.

BILCITCMATSCIG OETA lee 3g Se ahaa then dy wach Slalk codes SLEEPY CATCHELY.

Common in cultivated ground and waste places.

Silene caroliniana Walt............... Ea stadetarc de cua fapees PEATPINK SILENE.
Frequent on dry hillsides.
Sibememsteliata (Cle yi Aubs foe i oi ke ccs Uiela wi a clar STARRY CAMPION.

Wooded areas.

Sielepavoraminea 6. eee ee etelc eee eel eee LITTLE STARWORT.
Margin of Beech Spring Pond, location 34.

Stellatiay media: :(L.) Cytillo. 6. i.e. cee es COMMON CHICKWEED.

Common everywhere.

Le)

Stellaria pubera Mitchie 68 ec eg Ce We a eae GREAT STARWORT.

Rich woods.
RANUNCULACEAE
ANEMONE WiIPSiMianale: 32a Sigel ne eee eee tee VIRGINIA ANEMONE.
Occasional in woods.
Anemonella’ thalictroides) (i) eSpachs 22 ane ees ae ANEMONELLA.

Rich open woods.

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

Escape from cultivation; established in a few places.

Clematis), virginiana SE hates ston) eae ie oye cee VIRGINS-BOWER.
Occasional in thickets.

Del phintamvajacisy i... eae eee a tee ROCKET LARKSPUR.

Occasional in fields.

ElepaticavamericanaN@D@)) Ker igi. aes eet peer nee HEPATICA.

Occasional in woods.

Ranunculus: aborewvuselen eee ee LITTLELEAF BUTTERCUP.
Frequent.
Ranunculus DuUlbOSUS Hills soe ee ee eet ee 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.

halictrum) poly sammum, Mulley.) se 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:peleatum Ee). ste eee hae Sie MAYAPPLE.

Forms large colonies in woods.

20

MAGNOLIACEAE

Liriodendron tulipifera L.....TULIPTREE, YELLOW-POPLAR, TULIP-POPLAR.
Common in woods.

Masnoliay vitotmiata Tain 6. 65 6:60 sie 0 diene « oy o'els obs SWEETBAY MAGNOLIA.

Swamp in northeastern corner of grounds, locations 54 and 55.

ANNONACEAE

Sina meroOna Cl) OUNal ry lem ties eo oe one Bee aia ao PAWPAW.

Found only at the foot of the cryptomeria ravine near the river, location 46.

LAURACEAE

inmderanpenzoine (1), Blume! 2. scoot se SPICEBUSH.

Wet soil in woods and along streams.

Sassaueasealbidum.(Nutt.) Nees... 2... es ke ee ee ee es SASSAFRAS,

Frequent in woods and fields.

PAPAVERACEAE

Corydalissfavulaz(Rat.) DG... eee ee YELLOW CORYDALIS.
Occasional in rich woods, southeastern slope of Mount Hamilton.

Fea Paw erp DIRE el Pi a sys). Ges ais wiayel a/R e Salis gies miele d ole nee Poppy.

Occasional along roadsides.

Saneuinaria canadensis: Ln. ee ee ee ee ee BLOODROOT.

Wooded areas; not common.

CAPPARIDACEAE

SRICOMTIeES PITTOSAN ACG a) oa fe aiieleis sie) eee gids ees edie SPIDERFLOWER.
Near former Morris Place, at location 15.

CRUCIFERAE

PMLA ISMCATIAG CEISIS lis grees Missa foie ook ee ee hn yas Sogn ee SICKLEPOD.
South slope of Mount Hamilton.

Barcvateaevernal( Mill: Aschets. .. 0.20... 2 oe EARLY WINTERCRESS.
Common in fields.

Brassicasrapawt. (5. campestris L.) 2... i ke ee 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.

Dentatia laciniata ‘Mull! 0 4 ee eae ee TOOTHWORT.
Wooded areas.

Drabacverna fos sae es en WHITLOWGRASS, SPRING DRABA.
Frequent in cultivated soil.

Lepidium: campestren(©) Re Be. 2 ea eee FIELD PEPPERWEED.
Common in fields.

Lepidiumr virginicumy i). a ey ee ee VIRGINIA PEPPERWEED.
Common everywhere.

Rorippa islandica var. fernaldiana Butt. & Abbe?.......... YELLOWCRESS.
Wet soil.
Sisymbrium officinale (E.) Scop. 4 ya HEDGEMUSTARD.

Common in cultivated soil.

Sisymbrium thalianum (1.) J. Gay. 2... 2) 22 se MOUSE-EAR CRESS.

Abundant. One of our best examples of a winter annual.

SAXIFRAGACEAE
Heuchera: americanastcs. We ee eee eee eee ALUMROOT.
Shaded banks.
Saxifraga virginiensis! Michx. 920 oo" ogee eee VIRGINIA SAXIFRAGE.

Open hillsides and thin woods.

HAMAMELIDACEAE

Hamamelis-wirsiniaga Ee Se eee eee eee eh WITCH-HAZEL.
Scattered through woods.
PLATANACEAE
Platanus: occidentalis 1... 05. eG eee PLANETREE, SYCAMORE.

Low ground along streams.

ROSACEAE
Agrimonia ‘parviflora: Ait. 8o 05 ee cee eee ee 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.

Crataeous jpruinosa (Wendl.) K. Koch.::......,....5....- HAWTHORN.
From Mount Hamilton eastward.

Duchesnea indica (Ands.) Focke....3.......%. INDIA MOCK-STRAWBERRY.

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

F ragaria virginiana I Dita ovacl ol OR Ae a eee Sema te ky ae STRAWBERRY.

Frequent in woods and fields.

Geum>vircinianum L. (G. hirsutum Mubl.).................... AVENS.
Dry woods.

Porentitlavcanadensis L. (2. 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.

ReiunmustamericanaeMatsh.. oi... eee ee ce cc ree bea AMERICAN PLUM.
Hickey Run valley.
Prunus angustifolia INT AITS Liat rete tae ere een Or eit CHICKASAW PLUM.

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

minnesmpersicaa (les). Batschy avo os ee. oe ne PEACH.
Waste places and refuse dumps.

PAUMUSESELOUINAGE NEN ie 8 2. ees elke Da Siete bins BLACK CHERRY.
Common in woods and fields.

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

Py MUSMCOMMMUMUIS Te ee bbe ee eee 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.

Eyausmmatusy le (Malas. pumila Ve.) 4. cl ee ec ee as eels es APPLE.

Occasional.

23

Pyrus melanocarpa (Michx.) Willd. (Aronia melanocarpa

@Michss) BN) ee ie Uae a eee can BLACK CHOKEBERRY.
Thickets.
Rosa carolina L. (R. humilis Marsh. in part.)............ CAROLINA ROSE.
Dry banks.
Rosa jeslanteria Ls (Kirebseinosa i) Nae ee Oe SWEETBRIER.

Old fence rows and thickets.

Rosa viesiniana (Mil: einai ts eleene ey eiee train ee eine VIRGINIA ROSE.
Swampy places.

Rubus \argutus Links 8 oY ee ee HIGHBRUSH BLACKBERRY.
Old fields and fence rows.

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

Rubus) cunmeifoltus Pursh) ove er aa SAND BLACKBERRY.
Rare in poor dry soil.

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

Fields and roadsides.
Rubus; bispidus) (hit eli en daar ane SWAMP BLACKBERRY.

Introduced into native azalea garden with collected plants.

Rubus occidentalisyd.6 ie rn oe SUN See BLACK RASPBERRY.
Old fields and thickets.
Rubus phoenicolasius Maxim). (00000 en ee ae WINEBERRY.

Southwest base of Mount Hamilton.

LEGUMINOSAE

Amphicarpa jbracteata \(U.)) Ferm... i. a 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’ Medien). si ese. er oe POTATOBEAN GROUNDNUT.
Wet soil along river and streams.

Baptisia' tiactorta) GL.) (R.Br ie Wiehe eaten? 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

(CasstanGaSclcul ata iil xe ye.002) 2122), ecnteh ys svesehsia « eo Sinead soon PARTRIDGEPEA.
Open woods and fields. |

GassiammiGtitamsy lens ee ten, au llahsie Mel e-cid obs ere 20S SENSITIVE PARTRIDGEPEA.
Open woods and fields.

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

SO icts me CALL AC EMSIS Pde eta weeds 8) cya 2 sus alias Concuehatel drial hells sae Ja aioe REDBUD.
A single plant that was destroyed in 1948 to make way for new construction.

elicorvamaciana: Ts. os oc.) ep i le se so ATLANTIC PIGEONWINGS.
Frequent on dry hillsides.

Sroralatiamsacitcalis ile 8 eis. ta ia eh ea a dis RATTLEBOX.
Occasional in dry fields and waste places.

Desmodium ciliare (Muhl.) DC. (D. obtusum (Muhl.) DC.) .TicKcLoveEr.
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.
Galactianvolubilis, (.) Britt... 2.40.6 ee i ee ee ee MILKPEA.
Occasional in dry fields and banks.
Peachy RuES Mp ACHE OLIN) We ei ae ae oie ee eka wet an EVERLASTING PEA.

Escape from cultivation in the vicinity of old building sites.

25

Lespedeza‘capitata. Michio? 5258 ee nese = 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 sipulacea Maxims = 0202 i eee ee KOREAN LESPEDEZA.
Common along roads and in fields.

Lespedeza striata (Uhunb.) OH. & A. 21+ 202.222: JAPANESE LESPEDEZA.
Lawns, fields, and roadsides.

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

Medicago lepulina 1. 31 228 see ee eee BLACK MEDIC.
Roadsides and cultivated ground.

Medicago: ‘sativa 36.225 5025 6 hace eee ee ALFALFA.
Occasional in meadows.

Melilotus alba ‘Dest... 2 Ge ose Sas ee WHITE SWEETCLOVER.
Along roads and in waste places.

Mehilotas ofitcinalis. (G:) (Tama. 22 eee YELLOW SWEETCLOVER.
Roadsides and waste places.

Phascolus polystachios (1) BS S:Po 25 St ee = soe ee THICKET BEAN.
Mount Hamilton, location 8.

Robinia pseudoacacia 1... a s52). Sa ee ee BLACK LOCUST.
Common in woods, fields, and thickets.

sirophosiyies ‘helvola( (©) El... AS eee eee WILDBEAN.
Occasional in open places.

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

Stylosanthes; biflora.(1..)): B:S-P_. <2 2.952 (eee ee PENCILFLOWER.
Frequent in dry soil.

Tephrosia, virginiana (1) Pets... ap eee GOATSRUE.
Frequent in dry open woods.

rrOlUMPTALVENSEME fo. veo Fcc cet cee RABBITSFOOT CLOVER.

Common in fields.

Mrttolmeunybriduiny ls, hee e oe eds ogi tew coos ees ALSIKE CLOVER.
Fields and roadsides.

Trifolium SEAR CISC lee rtetareens cial se ercr sce etter doaere aac sa RED CLOVER.

Common in fields and waste places.

iiitalimeprocumbpens hy. i658) gi eases eo eee eo Low HOP CLOVER.

Fields and waste places.

PETE GU EPERS ley. Me. els Ll eee sees oe vlelien WHITE CLOVER.

Lawns, fields, and roadsides.

Mician angustifolia. Reichard... 0)... bee ee NARROWLEAF VETCH.
Woods and fields.

MCA CATONTIAMA Walt. eo ce Ba oe ee CAROLINA VETCH.

Occasional in woods.

NATE EN TILOS AOE 0c dos vi sice a ak ko ee bod ne ee oe ek HAIRY VETCH.
Occasional in fields.

LINACEAE

Eiumpmediuay(Planch,) Britt... ............2 0.050065 YELLOW FLAX.
Open woods.

Linum striatum Walt.

Occasional in open moist soil.

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

Oxalis filipes Small
Woods, fields, and thickets.

Oxalis stricta L.
Frequent in disturbed soil.

MPalismVIOlacea Me. 6 8 oo ce hee hoe kee: VIOLET WOODSORREL.
Frequent in woods.

GERANIACEAE

Geranium carolinianum L.
Common in fields.

27

Geranium maculatum Li oe a a 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. vzridescens L.)............. BLOOD POLYGALA.
Frequent in dry open ground.

EUPHORBIACEAE
Acalyphaveracilens, Grayiiss i) see oe eee SLENDER COPPERLEAF.
Cultivated ground.

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

Euphorbiay corollata i rey sak ee eae ee FLOWERINGSPURGE.
Woods and fields.
Euphorbia ipecacuanhae io) oe eee ee eee IPECAC EUPHORBIA.

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

Euphorbia supina Raf. (E£. maculata of authors, not Linnaeus)
SPOTTED SPURGE.
-~ Common.

ANACARDIACEAE

Rhus :copatlina) Toni. oe es aera CL a uae ea 3 FLAMELEAF SUMAC.
Thickets and margins of fields.

Rhus; glabra deny coi at ek nes teat a einen a arta eet an om SMOOTH SUMAC.
Fields and thickets.
Rhus radicans L...... ih IRRREINT EN ee A TR eS ag POISON-IVY.

Common everywhere.
Rhus. ‘typhina: Fie 725 9 Pea eye cin teen STAGHORN SUMAC.
Occasional in fields and woods.

RUS. Vernier, MUP Tne a cap Mee EO ae 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
MexaTODaCARe Nitra Meiers My uit an tic or tim a uated eaten ane ats AMERICAN HOLLY.
Occasional in woods.
Mexevierticillatai(@ls) Grays ic et. ce lee oh WINTERBERRY, BLACK ALDER.

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

CELASTRACEAE

Gelisthuswscandens eo i ee ae Ne AMERICAN BITTERSWEET.
Imount Hamilton and other wooded areas.
Euonymus ATMEGIGATIVIS MI uit, fatter gh ete ela min Nal RO te out BROOK EUONYMUS.

Woods and ravines.

PNGCEIMCAIMPESTE CHM acc pie ce cM (ni a a luldias ols, wal eisalhays HEDGE MAPLE.

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

Acer negundo peer ir AN ONS eA IP Diam SEAR ONE Rly Silat Cueren eNO BOXELDER.
Frequent.
PAGE TARTU URATMIEmietny Nt r RED MAPLE.

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

INGETASACCM ATIC A te ule Gai te 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. (J. b7flora Walt.) ....SPOTTED TOUCH-ME-NOT.
Wet and moist soils.
RHAMNACEAE
Ceanothus americanus L.............. JERSEY-TEA, CEANOTHUS, REDROOT.
Occasional in woods.
VITACEAE
Parthenocissus quinquefolia (L.) Planch.............. VIRGINIA-CREEPER.
Woods and thickets.
Rtciseaestivaliss WMichx ii Ui liye sia ele wb iba y SUMMER GRAPE.

Frequent in woods and thickets.

Vitis labrusca: Dineen toes See Se ee ee ee an ee FOX GRAPE.
Swamps and watercourses.

Vitis vulpina E.(V. cordifolia) Michx:) (pee oe eee FROST GRAPE.
Occasional on banks and in woods. ;

TILIACEAE )
Tilia neglecta Spach (T. americana of the 1919 “Flora of the District of
* /e@olumbia sce ay: see ate ena cues 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
Columbia77 nor snnacus) eee eee ere COMMON ROSEMALLOW.

Margin of streams and in swamps.

Hibiscustsyriacus (octane ae see ee eee eee SHRUB-ALTHEA.
Established near old dwelling sites, location 17.

Flibiscus: Crlomumi de pice 7 tec co ae ecicttnee es FLOWER-OF-AN-HOUR.

Occasional in cultivated soil.

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

Occasional in waste places.

Sida spinosa 1. . Wa) ik 6 uk asia Mies oe aloes eeeeee et rua PRICKLY SIDA.
Cultivated soil.

Aseyrum, hypericoides( 1.25 23 were ie Gees eae. StT.-ANDREWS-CROSS.
Common in woods and fields.

My pericum:canadense 0.0). :: cee ee ee ee ee ST.-JOHNS-WORT.
Occasional in roadside ditches.
Hypericum denticulatum: Walt.” 22 222 ¥.5...-- CoPPERY ST.-JOHNS-WORT.

Frequent in moist soil.

Hypericum gentianoides (L.) B.S.P. ;
(Sarothra eentianoides yi). ls ann eee ORANGE PINEWEED.

Frequent in poor thin soils.

Hypericum mutilum L.
Wet soil especially near water.

30

Phy pericumn perrotatumn L: (67 2) a akitak. J COMMON ST.-JOHNS-WORT.

Occasional in fields.

Hypericum spathulatum (Spach) Steud. (H. prolificum of American
UTE OVO) ee eee Ee Pe en Pc SHRUBBY ST.-JOHNS-WORT.

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
Piclamematoimata( Nutt.) LeConte.. 2.26... ee he de eve 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.

TAI MMe AL re ie 2 yk sak alae) Sela lalecal a's 3 BIRDSFOOT VIOLET.
Occasional in dry soil. |

Viola primulifolia L.
Magnolia Swamp only, location 55.

GIB SE Ee 1 a A ARROWLEAF VIOLET.
Fields and thin woods.

Viola triloba Schwein.
Woods.

aj

PASSIFLORACEAE

Passiflota ) lweea) Gia ees Ce ais Rn ia ee eae PASSIONFLOWER.
South and east slopes of Mount Hamilton.

LYTHRACEAE

Cuphea petiolata, (2) Nochnenn se cera ee 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.

Ludwista alternifolia var. \typica, Munzs.5. 3002) 1) ee SEEDBOX.
Wet soil.

Ludwigia palustris var. americana (DC.) Fern. & Grisc. (Isnardia palustris
EY Miers Corer ord eat enien ten Muar MMR MAUR te Aisa igi 2 MARSH PURSLANE.
Margin of ponds.

Ocnothera: biennis 34 a ee ee ee ee EVENING-PRIMROSE.

Common everywhere.

Ocenothera: fruticosa 2 Le. spore eect eine SUNDROPS.
Open ground.

Oenothera laciniata Hill

Frequent in cultivated soil.

ARALIACEAE
Aralia nudicaulis L.......... EEN a one nee Mato WILD SARSAPARILLA.
Woods and banks.
Aralia spinosa lee. 2 ois enero DEVILS-WALKINGSTICK, HERCULESCLUB.

Northwest slope of Mount Hamilton.

Hedera’ helix Teo) Nai Noreveaeteae ern ecre coe einen ENGLISH IVY.
Southeast slope of Mount Hamilton.

32

UMBELLIFERAE
Angelica venenosa (Greenway) Fern. (A. villosa (Walt.) B.S.P., not
NEAT MP LMP ROU. Bad ith setiietiatla ta) Sys Raut ‘asaiieuentesler te hatldarecldel sts et ANGELICA.
Occasional in woods.
Chaerophyllum procumbens (L.) Crantz

Occasional in wet soil.

Gicutarmaculata sl. 1.8) es a a ee ee ee SPOTTED WATERHEMLOCK.
Wet soil.

Cry ptotaenia, canadensis (L.) DG... i500 8 eS. as als 8) HONEWORT.
Moist soil.

DD) AURA SAIC ALO CAME nse ene itech aie vara tiem Mine ctl NE sey Mh fe WILD CARROT.

Common everywhere.

Sanrculaveanadensis I..6.. 0s ee ee ee ee BLACK SNAKEROOT.
Woods.
Taenidia integerrima (L.) Drude

Occasional in dry woods.

PiAawaurean( lr) WWieD.,J. Koch...) jj ee ei ees « GOLDEN ALEXANDERS.

Occasional in open woods.

CORNACEAE

Gornusvamomum Milly. eo SILKY DOGWOOD, CORNEL.

Frequent in woods and along watercourses.

Cornmuswnoridage re ee in SS OS eo, FLOWERING DOGWOOD.

Common in woods.

ERICACEAE
Chimaphila maculata (L.) Pursh................... STRIPED PIPSISSEWA.
Woods.
BpiOreamcepensrge se oe ee. S| TRAILING-ARBUTUS, MAYFLOWER.
Frequent on wooded banks.
Gaultheria procumbens L................ CHECKERBERRY WINTERGREEN.

Naturalized near Red Oak Spring, location 48.

Gaylussacia baccata (Wang.) K. Koch............. BLACK HUCKLEBERRY.
Dry thin woods.

Gayilussaciafrondosa (L.) T. & Gio i ec es DANGLEBERRY.
Dry woods.

33

Kalmia latifolia (E.).. (2005 eee ee ee MOUNTAIN-LAUREL.
Frequent in dry open woods. |

Leucothoe racemosa (L.) Gray (Eubotrys 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 Ton oso tan ge yy ee ne 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 x 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.
Vaccinium vacillans’ Tork.) 4-4 eee BLUERIDGE BLUEBERRY.

Well drained woods and on slopes.

PRIMULACEAE
Anagallis" arvensis) U5. 56 UM Pe eyelets ie ce SCARLET PIMPERNEL.
Cultivated or other disturbed soil.

Eysimachia ‘ciliata: Ws). ey oa) eens un ee ner FRINGED STEIRONEMA.
Woods and fields.

Lysimachia: aumemulariay bh). (yea ae ee nee ae MONEYWORT.

Near old dwelling sites.

Lysimachiaiquadrifolia jc 02 ee ea ae ae FOURLEAF LOOSESTRIFE.
Woods and fields.

Diospyros virginiana) Ligh: i) oS eese er aee es PERSIMMON.
Woods and fields.

OLEACEAE

SE biomaMenustVIPOIMICUS Ess.) s) 0); .e kde ssn vis + atid os oe eine rt FRINGETREE.

Frequent in woods.

aR s ann eriCatlae ls suse ie eas lan ee cdaie NS orwlela ot Manes oR WHITE ASH.

Occasional throughout the area.

Fraxinus pennsylvanica As eM) a eee epee oda ee RY eh ca RED ASH.

Frequent in low ground.

Sealine AMEN MMAR GMA PN eet eis og AV are alge laste el oy aele ee oe COMMON LILAC.

Common around old building sites.

GENTIANACEAE
Sabatia angularis (L.) Pursh................ SQUARESTEM ROSEGENTIAN.
Occasional in fields.
APOCYNACEAE

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

tina TTT OG es os 8 oo Se OL aoe do 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.
Occasiona! in moist or wet soil.

Asclepias purpurascens L..... 2... ees PURPLE MILKWEED.
Occasional on east slope of Mount Hamilton.

PASCICIMASHSVISACA Tos i066. 5) 6 leis eid aly ie ee vee eee ee COMMON MILKWEED.
Frequent in fields.

BNSC CE IAS EIMDEEOSA ene Valet Cid) e, Lib ale We thats dle begs BUTTERFLYWEED.
Occasional in dry fields.

Evsclepiaswyiridifiora Raf...) 6. betes eee GREEN MILKWEED.
Common in dry fields.

35

CONVOLVULACEAE

Convolvulus: arvensis: oN a ee toe EUROPEAN BINDWEED.
Common in sandy areas.

Convolvulus ‘seprumiii ct is a ee gee or ee HEDGE BINDWEED.
Common in cultivated soil.

Cuscuta: Stonovity Ww Wd iii yoo) ae ay eee ae DODDER, LOVEVINE.
Frequent in low places.

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

Ipomoea coccinea es see eee 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 (1E)) ‘Roth: ). 2032225: COMMON MORNING-GLORY.

Cultivated soil.
POLEMONIACEAE

Phlox: paniculata Un) 2k fhe ee eee er eee eee PERENNIAL PHLOX.

Occasional; escape from cultivation.
BORAGINACEAE

Echiam-vulsare: (0 ee eee VIPERSBUGLOSS, BLUEWEED.
Occasional in disturbed soil.

lathospermum)sarvense® Lc ..)2 2) ea OCG ies ieee eee 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

Verbena’ hastata ess ss eS Ne ul es aes ae area ee BLUE VERBENA.
Low open ground, not common.
Verbena utticiiolia Ai!) ee ee ee eee WHITE VERBENA.

Open ground and thin woods.

LABIATAE

Collinsomia ‘camadensis (Eso... ee he ee ne Gees at HORSEBALM.
Rich woods.
Gunila-origanordes (1. Britt... 6.2... ee ee MARYLAND STONEMINT.

Frequent on dry hillsides.

(GlechoOiInay NeGeracean leg cee is eee beh GILL-OVER-THE-GROUND.

Frequent, often forming a dense ground cover.

Hedeoma pulegioides (L.) Pers.......... AMERICAN FALSE-PENNYROYAL.
Woods, fields, and roadsides.
Paniumemamplexicauley Ti) Wie 0s ee en eh, Sith ea RR gate al HENBIT.

Common in disturbed soil.

Lamiunnapurpureum De PURPLE DEADNETTLE.
Waste places, occasional.

EVGOPUSPVITEINICUS To... i. ie ee ee te eee tees VIRGINIA BUGLEWEED.
Frequent in wet or moist soil.

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

_ Occasional in moist soil.
Vemch ams picatayy 6 F) cS eee ee SPEARMINT.
Vicinity of old dwelling sites.
Monatdapunctata el je ee SPOTTED BEEBALM.
Sandy soil in location 36.

Perilla frutescens var. crispa (Benth.) Deane (P. frutescens of the 1919
Pilorasotetae -Dusttict: of Columbia.) ...0.5.....0.56.-5.--. PERILLA.

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

Pane MVNO ARIST 305s oles a sale Wee ele ww alee ia bee ee oes 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.

SAAMI LARA gM ref ahs. olf oc loe Sele Sw ee as Bald acl s 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.

27,

Scutellaria integrifolia L.
Frequent in woods and on banks.

Scutellaria lateriflora) boos Res oe eee MAD-DOG SKULLCAP.
Rare, found in wet soil near river wall, in northeastern part of location 40.

Feichostema:dichotonum™ 1.0455 0 ee ee BLUECURLS.
Occasional in thin woods and in fields.

SOLANACEAE

Datura’ sttamonium Ei ee ee oe ee JIMSONWEED.
Cultivated ground and waste places.

Eycium ‘halienfolim Malls.) COMMON MATRIMONY-VINE.
Vicinity of old building sites.

Physalis heterophylla (Nees: 22. 3 9226 See cere oe eee GROUNDCHERRY.
Mount Hamilton and other wooded slopes.

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

Solanum. carolinensec do. eee ee a ee HoORSENETTLE.
Common. |
Solanum: dulcamata’ U2. ao en ee BITTER NIGHTSHADE.

Occasional in cultivated soil and in thickets.

Solanum nigra sooc i cee ays ce eee eee BLACK NIGHTSHADE.
Common.
SCROPHULARIACEAE
Chelone tglabra’ Ti. OM 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. (Azreolaria villosa
(Mihi Rabie ayia ae ek mse ree DOWNY FALSE FOXGLOVE.
Frequent in woods.
Linaria, canadensis«(E)) Dumonts. 222 23 see OLDFIELD TOADFLAX.
Common in sandy soil.
Linaria svuloaris| Hill) joe ee cee ee ee BUTTER-AND-EGGS.

Occasional in waste places.

38

Lindernia anagallidea (Michx.) Pennell (1/ysanthes attenuata of the 1919
pblarayot the WMistrictior Columbia). 3.8... sas: FALSE-PIMPERNEL.

Occasional in muddy soil.

INEIITUTS PETG ENS eer cae ns ole cis ee eee, wsuer wien djele wus e nie MONKEY-FLOWER.
Occasional in wet soil.

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

Penstemonilaevieatus, Ait... 00... oe oe ee SMOOTH PENSTEMON.
Occasional in meadows.

Detbascumiublattabla ey anit cme ee ee valaye gedte se eine MOTH MULLEIN.
Clearings and in cultivated soil.

Metpascumpehapsus.L. is ee ws FLANNEL MULLEIN.
Disturbed soil in woods and fields.

MELOMICANATVEMSIS! 1s i ee ad eee es COMMON SPEEDWELL.

Cultivated soil and waste places.

MELOMl CasOMmICHHAlS De. ele ic See Cee dcae so DRUG SPEEDWELL.
Woods and banks.
Metomicasperegtind Te... ee PURSLANE SPEEDWELL.

Cultivated soil.

Wetomtcasetpyilifolia Lk THYMELEAF SPEEDWELL.

Occasional in woods and fields.

BIGNONIACEAE
Campsis radicans (L.) Seem. (Bignonia radicans L.)....TRUMPETCREEPER.
Woods and thickets.
Catalpa bignonioides Walt........................ SOUTHERN CATALPA.

Established on the west slope of Mount Hamilton.

Watalpayspectosa. Warder... 0... 6. ee NORTHERN CATALPA.
Location 17 and adjoining areas.

OROBANCHACEAE
Epifagus virginiana (L.) Bart. (Leptamnium virginianum (L.) Raf.)
BEECHDROPS.
Frequent under beeches.
ACANTHACEAE
Ruelliancarolintensis (Walt.) Steud...........0.....0.5 200004. RUELLIA.

Occasional in thin woods.

39

PHRYMACEAE

Phtynia leptostachya We 90 0!3) 8 hy ie a ae ee ee LOPSEED.
Woods and thickets.

PLANTAGINACEAE
Plantago aristata Miche.) 322 ae ae BOTTLEBRUSH INDIANWHEAT.
Cultivated ground.
Plantaso) lanceolataw lr oe ak anc eee: BUCKHORN PLANTAIN.
Common everywhere.
Plantago major (es chin oi ache ee Ve eee 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; Vy io. ee eee BUTTONBUSH.
Wet soil along watercourses and swamp margins.
Diodia teres | Woalty. ite eek oe) ya alleys ee ae ee 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.

Galium/apatine Ti one see CATCHWEED BEDSTRAW, CLEAVERS.
Frequent in fields and woods.

Gallium citcaezans: (Michx. 3 Ou eh ee ete WILD LICORICE.
Woods.

Galium pilosum Ait.

Frequent in woods and fields.

Galium tinctorium L. (G. claytoni Michx.).............. DYE BEDSTRAW.

Frequent in wet soil.

Galium triflorum: Michx 32 325) 42 4 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.

Niitehe Map repens tates eG abe eo iet cts «i shacs eles ave es aoanertre PARTRIDGEBERRY.

Occasional in woods.

CAPRIFOLIACEAE
Honieceravjaponica WUNUND. 6 2... jes oop ee ot JAPANESE HONEYSUCKLE.
Common everywhere.
MonicerasScmpervarens Wi) oh wick See le s os TRUMPET HONEYSUCKLE.

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

SAMMMUCUSE CAMAGENSISLS.. ck haces coe ebec dues cow cee 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.

Maburnum:acerifolium L.................-.06.: MAPLELEAF VIBURNUM.
Frequent in woods.

Waburmuimecassinoides (Lot oc ck clon ec wees eee es cewecuaes WITHEROD.
Wet soil on slope opposite the Cryptomeria planting in location 45.

Vaburnum dentatum: Lz... 6.0... 6. ke cw SOUTHERN ARROWWOOD.

Frequent in woods and along watercourses.

SeBUEMUNTPEUMLOMUM. Li... hs ee ec ee eet BLACKHAW.
Woods and thickets.

CUCURBITACEAE

SUSRRES J DEER 5 ER ee BUR-CUCUMBER.

Occasional in thickets along watercourses.

CAMPANULACEAE
LPS) ay site ey RY beeen 2 an 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 millefolium L

Common everywhere.

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

AND COstas trikida ret eng pat ers ote ea tice ee GIANT RAGWEED.
Cultivated soil and low ground along streams.

Antennatia nevlecta\Greene* st ere ee ee FIELD PUSSYTOES.

Open woods and fields.

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

Antennaria plantaginifolia (L.) Hook.
Woods.

Anthemissarvensis (Lo) ac cno ieKcee eeee e FIELD CAMOMILE.
Occasional in fields.

Acctium. minus, (aill)opernhs «2a. ee ees COMMON BURDOCK.
Cultivated soil and waste places.

Artemisia ‘annuasls.s ay oo.ce es ee ane ee Ce ee eee ee eee WoRMWOOD.
Occasional in fields and waste places.

PAECeMISIa, WUlPATIS Do rere one ee COMMON MUGWORT.
Brought in with nursery stock and widely scattered.

Aster oGivaricatus Ly cigs va he Sree eam = i acne eee ge ce 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 ess 623 ee EASTERN BACCHARIS, SEA MYRTLE.
A single plant near the boundary line, location 24.

42

IBIGENS OI pIMtAtaM ee. Ge leb a fo) otal aos bs in oie) ow awe Rca SPANISH-NEEDLES.
Common,
ASIC ON SECON COS AG py ae ee chet ie tei TM eA BEGGARTICKS.

Damp woods and fields.

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

Occasional in woods.
Kehoe rillamiumcea misc: sot cis.iche lar. /e tes is avalos eget vers ave g alata SKELETONWEED.

Occasional in dry soil.

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

Fields and meadows.

Gheysopsisemariana=(L-)) EM. i als tice eae GOLDEN-ASTER.
Frequent in woods and on dry banks.

ROSH CoN TAMMY US estates oe cess sh cast eh e eie etsy a'e psc ello ein levee fobs ale CHICORY.
Cultivated and waste ground.

Giisrumiarvense: Ge) SCOP... sea eee bee alee CANADA THISTLE.
In temporary nursery area of location 27.

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

Cirstumayvulgarem(Savi) Tenore.... 6... 2.5.2.2 ee ee ee BULLTHISTLE.
Frequent in waste places.

Goreopsismanceolata Lhe. eee ee ele te 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.

Elephantopus carolinianus Willd...................... ELEPHANTSFOOT.
Frequent in woods.

Erechites hieracifolia (L.). Raf.................0%. AMERICAN FIREWEED.

Common in disturbed soil and in burned-over places.

Ericeron;annuus (L))) Pets). ..2 5... eee oe ANNUAL FLEABANE.

Common everywhere.

Erigeron: canadensis 15. acca, epee eee ae ee eee 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. (£. ramosus (Walt.) B.S.P.)...DaAtsy FLEABANE.
Common.

Eupatortum: album (WL... 2. oe oer ee oe eee ee eee EUPATORIUM.
Thin woods and fields.
Eupatorium)coelestinumy [a0 2 eee 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: Vio. 3... eee ee eee BONESET.
Frequent in fields and thickets.

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

Eupatorium pubescens Muhl.
Fields and woods.

Eupatortum purpureum) E030. 0 oes ee er JOE-PYE-WEED.
Meadows and thickets.

Eupatorium rotundifolium L.
Thin dry woods.

Eupatorium rugosum Houtt. (E. urticaefolium 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.

Gnaphalium:‘obtusifoltum i222 he ee eee SWEET EVERLASTING.
Woods and fields.
Gaaphalium purpurcumil.. 2.2. oo. en eae PURPLE CUDWEED.

Common in disturbed soil.

Helentam nudifiorum Nutt) 0 22.02 ee eee SNEEZEWEED.
Occasional in fields.

VSL AMES CIV ATICALUS le ete te fe Ati ee ene 2 hie etal bowie seiavadd evi Mbile SUNFLOWER.

Frequent in woods.

relianthus tuberosust Wei. 3. etek eee etic eee «dol gie eis JERUSALEM-ARTICHOKE.
Low grounds and thickets.

BRLe eet CITA EO MOV MULE 1.8 Nie) Aoi ae alln os akntoget'e\i'e ie lg isle cae the es #18 HAWKWEED.

Occasional in fields and open woods.

iteraciimevenOSUiIme Leese. oe aoe Seok a ots POORROBINS HAWKWEED.

Common in woods.

ERVRGEMOCHISPAGICAta al i/o ck leg eles ame while aele cies e « CATS-EAR.

Occasional in lawns.

Krigia biflora (Walt.) Blake (Cynthia virginica (L.) D. Don)
Location 6.

Krigia dandelion (L.) Nutt.

Occasional in woods.
Baierapvaeeinicac(I-) Willd... 2... cece eee eee DWARF-DANDELION.

Frequent in woods and fields, especially in disturbed soils.

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

Lactuca canadensis L. (L. sagittifolia Ell.)
Cultivated soil and waste places.
Lactuca floridana (L.) Gaertn.
Woods and fields.

Lactuca floridana var. villosa (Jacq.) Crongq.
Woods and thickets.

actucausaligna ye ob. lke cin tele eee Le WILLOWLEAF LETTUCE.
Occasional in dry fields, location 49.

PACH CABSCAMO LAE, cee. Oe eile h PRICKLY LETTUCE.
Waste places.

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

BMA AMSA ARIIOUIGTAN oO. a's iat Mia ein ile ake v Bans) ein wiece A waits TARWEED.

Occasional in cultivated or disturbed soil.

Mikania.scandens (L.) Willd..............55...-- CLIMBING HEMPWEED.

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

45

Prenanthes alba ies oe eos Oe ea a ee RATTLESNAKE-ROOT.

Frequent in woods.

Prenanthes “serpentaria) Pursh= 5. 9c ee a ee LIONS-FOOT.
Occasional in woods and thickets.

Rudbeckia lacintata see i ee ed eee 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. 8 hs ee ee ee RAGWORT.
Occasional in fields.

Senecio; vulearis Leek aie eo ee COMMON GROUNDSEL.
Southeastern slope of Mount Hamilton, location 11.

Sericocarpus asteroides (L.) B.S.P................ WHITE-TOPPED ASTER.
Woods and fields.
Silphium -teifoliatum lc 232. ee ie eae ROSINWEED.

Thickets and margin of woods.
Solidago ‘altissima- Lei ts ec ee ee See ee GOLDENROD.

Margin of woods and thickets.

Solidago ‘bicolor Ti cir. s cee nae ee SILVER GOLDENROD.
Wooded hillsides and riverbanks.

Solidago erecta Pursh
Open dry ground.

Solidago graminifolia (L.) Salisb.
Fields and thickets.

Solidaso guacea. Ait cso 30 os 2. earn ee ale ee PLUME GOLDENROD.
Old fields and meadows.

Solidago nemoralis Ait.
Frequent in dry soil.

Solidago odora Ait. (5S. 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.

SONCHUSIARVENSISH tered ier Sek a a ee FIELD SOWTHISTLE.

Near greenhouses, location 18.

SONCHMUSTOLELACEUS Mies ll ieee coc eee ee eo ae COMMON SOWTHISTLE.
Common in cultivated ground.

Taraxacum erythrospermum Andrz. (T. laevigatum
DiMA VAAUEHOES) Ver yt ee ct aay oe wien esc pa is Si SMOOTH DANDELION.
Common everywhere.

Taraxacum officinale Weber (Leontodon taraxacum 1.)
COMMON DANDELION.

Common.

Verbesina occidentalis (L.) Walt....................... ,, CROWNBEARD.
Meadows and thickets.

Wernontavelauea.(L.) Willd. 3. 2 de ee ee IRONWEED.

Margin of woods and in fields.

Vernonia noveboracensis (L.) Michx.

Woods 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
AGmiRaREAe Te oa oie ae i oe ee 59) Teemminosae, S55..5..>'se poem ee ae 24
PXCCTARCAS (5 2 os Sx inane bee oe nino Ee 29 1 Daltacese 2405 wi scl ese eee 13
IPBAGAE | Gs oe cic eeie e ee n eS aolake 191 fanneeae oe ee Sc eee eee ee 27
Palisa acege, ans oie wa Bia ee Deere 5 | Lorntftagese: coe eras ope = ee 17
Amaraqaaccae: “ein Se awee teens 13 1 Dyeopodizeede 5.3555 oe oe eee 3
Amargilidacese: oo See oo te eee 144 Dythracese 2S. 8 a ee ee 32
Annonsceae =. 00200. LLL ba | Magnoliacese eee eereereee 21
A AlWaACRRE oS OS ee hoe eee 30
pOGTRACEAE ook ae See ee eee 33144 1é
Aonifoliageae ss Sees oe oe ee DO Mer ce eo
AtaCeae dooce eee eee tee enim 12 | Nyssaceae (3) ee 32
ee Fedo tee Coe ae 22 Oleareae oe ee ee ee 35
Solpehiacede 2 8 Sor cos Be eie 17 >
Asclepiadaceae 35 Onagraceae ..- ++. ee ee cece eee eeee 32
pO gs a Ane eae | Ophioslossacese: 2 2. ss asec sce sie ee 3
Balsominacgae” 2.3 obec ees 26'| Orcidarese 25> S520 eee 14
Berberidaaese fos es oe eee 201 Orghanchacese 32 26 oes = ein ce ne 39
Behl? 336 see aee ewe ee ieee 15) Osmundageae eee ese eae 2
Bipnontinese oe ees Sete 30} Oxalidarese: ee) oo oe oe eer 27
pe 36 | Papavemcese oS -. seis cee Oe ee ee 21
icommpannlacene » ec Sine ee aed ie Aq} Passiflorsaae 2 Pee ee eee 2
Cappasidarease os 2 oo oe eee 211 Phrymacae soe ne eee ee eee 40
Caputoliatese.- <5 (Aa sen bee ete Aq | Playtolaccatege 22 2 eee eee 1g
Cadgephyllcese....3 202 2a. 3 See Se 194 -Pmacese 22 Lee S oe ie eer 7
Celashiatede ala eee take eee ee 29), Plantapinageae ieee ee ee eee 40
(Chenopodiacese* = oc) eo oe eee eee 1S) Plaiandeese: 2a ae ee ee ee 22
astereeae 6 eis acs fhe aie ae Be ee 341 Polemoniqesae® 2 oo ee ee eee 36
Gommelnacese 22265 2 8528 Soe eee 13) Polysalacese as oe nee eee ee 2s
Gompnsiiae: 65.0925 PN ee £2} Polyconaccse 0 See eee 17
Gonvolwnlatese 25-050 ie ae ee 36} Polypodiacese | 3.2.52, eee ee eee +
peace Sse ee por Seema 34:1) Pontederiacese ic 226.22 2ee se oo 12
(cenctenae oe ee Be a) eons 21 | Portulacaceae ........-..-.------- 19
(Guantbiiacese) fe Se See. se os Aq | Pomnlacese ooo eee eee eee 34
Eyperagae 2, oS Ce oe ee 10 emcee ee eee 20
Diosentcaceae se is eee 14) Rhamnacese ee ee eee 29
Piciace 34 Rosaceae sr aagmiee eter sini es a 22
Becher Ben cree ae en we oe Rubiaceae: soc5,02 es eee eee 40
UISetAGede ge. is 2 oie i eee
reaped Pe tO ene ee ees 331 Salteacese 3 so ee caw ance ceeee 15
Bupharsincese to 25 oe oe ee 22 | Santalacese (22 6c wee ee eee 17
Fasareae 15| Saururaceae secs co ceee Mee Cee eee 14
S FSMD ict a gee aera epee ' Saxiftaraqeae” <. Sovw eck Sone en eee
(Gentianatese Ves aes ee -igeec 35 pecophnlanacreae. 0 oe oe eee ee 3s
(Germmagae ee oor ctacce 27 | SiManbareae oe oon ee eee eee 28
Cranuncac 22" Bere hae eee 5) solanaicac 2). bee ae ee eee 38
Suitiberae | 4) 2) 22 aenou earn o 30. spaleaniacee 2. ae oo hice Sie ee eee 5
Hamamelidacese ) 356 oo4 de ee 92) dilincede ee ee eee 30
Hydmdharitaceae 5 22 ce 5) cy plaeede” oe ce eee eee +
Berd ape a os en ee 14 | Ulmaceae ........-.--..---.-2--- 16é
Unibellifeme seco 2 eae eee 53
jupliedacee ee ele ee ee ee 13:1 DenGiaeae es oc as aoe tee ee 17
Junmcese 2a oe Ee ee 12 Vat ee ee ee 36
Pabintie ss Joes ooh os aed 37. Witacede’. Scio eae teem e eee “etme eo
lonmesde, S20 2 ee oe ee 24.4 Violacede:.325 5 coed ce esieeioe 1

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

48

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