FLORA 07 THE DISTRICT OP COLUMBIA. 45
S. SOBGHASTBTJM
I. NYMPHAEA
11. ASTRAGALUS L
1. Astragalus carollnlanus L. • Milk vetch.
Low ground along the upper Potomac. June-July. Northern states, south to Ga.
(A. canadensis L.)
12. STYLOSANTHES Swartz. Pencil flower.
Leaflets oblong-linear to oblanceolate, the larger ones 3 cm. long or longer, usually very acute; bracts subtending the flowers entire; plants very bristly.
1. S. biflora.
Leaflets oval or elliptic, mostly leas than 2 cm. long, usually rounded or obtuse at the apex; bracts 3-parted; plants only slightly bristly 2. S. riparia.
1. Stylosanthes biflora (L.) B.S.P.
Dry soil; common. July-Sept. Eastern U. S. (5. elatior Swart/.)
2. Stylosanthes riparia Kearney.
Dry soil; occasional. June-Aug. Pa, to Ala.
13. MEIBOMIA Heist. Tick trefoil.
Stipules large, green, ovate or triangular, persistent.
Stems trailing.
Flowers purple; leaflets orbicular or nearly so; joints of the pod 3^5.
4. M. zaichauxii.
Flowers whitish; leaflets broadly ovate; joints of the pod 2 or 3.. 6, U. ochroleuca.
Stems erect.
Leaflets glabrous or nearly so, very acute 6. M. bracteosa.
Leaflets hairy, very obtuse 7. M. canescens, Stipules small| brown, narrowly linear or subulate, often deciduous.
Pod borne on a stalk many times longer than the calyx, not lobed on the upper maigin, very deeply lobed on the lower margin, the joints 1-4. Stems usually erect; plants nearly glabrous.
Flowering stems naked, rising from the base of the sterile leafy stems.
1. M. nudiflora.
Flowering stems leafy.
Leaves scattered along the stems; leaflets obtuse 2. M, pauciflora.
Leaves crowded at the top of the stem below the panicle; leaflets taper-pointed.
3, If. grandiflora.
Pod sessile, or borne on a short stalk only 2 or 3 times as long as the calyx, lobed on both margins but much more deeply so below than above.
Leaflets small, most of them lesa than 2.5 cm. long, rounded at the apex; joints of the pod 2 or 3.
Plants glabrous or nearly so; petioles about as long as the lateral leaflets.
14. M. marylandica.
Plants copiously hairy; petioles usually much shorter than the lateral leaflets.
16. M. obtusa.
Leaflets larger, most of them more than 3 cm. long, usually much larger; joints of the pod often more numerous.
Stems and leaves glabrous or nearly so. Joints of the pod 4-6.
Leaflets lanceolate or oblong, all or most of them less than 2 cm. wide, green beneath 8. M. paniculata.
Leaflets broadly ovate or oval, most of them well over 2 cm. wide, glaucous beneath 9. M. laevigata.
Stems and leaves conspicuously hairy.
Leaflets densely velvety beneath, the hairs spreading 10. M. viridlflora.
Leaflets not velvety beneath, the hairs appressed.
Joints of the pod triangular, with a conspicuous angle on the lower side;
pods conspicuously stalked 11. M, dlllenii.
Joints of the pod oval, rounded on the lower side; pods sessile or nearly so.
Racemes of flowers dense, with numerous large bracts just before flower- ing; corolla 8-12 mm. long; joints of the pod usually 4-6.
12. M. canadensis.
Racemes very loosely flowered, the bracts very small; corolla about 5 mm.
long; joints of the pod usually 2 13. M. rlgida.
1. Meibomia mtdiflora (L.) Kuntze.
Dry woods; frequent. July-Sept. Eastern N. Amer. (Desmodium nudiflorum DC.)
Plants with white flowers are found occasionally.
2. Meibomia pauciflora (Nutt.) Kuntze.
A single specimen seen, collected near Pierce's Mill, Sept., 1878, by Ward. Eastern U. 8. (Desmodium pauciftorum DO.) *
3. Meibomia grandiflora (Walt.) Kuntze.
Woods; occasional. June-July. Eastern N. Amer. (Desmodium acuminatum DC.; D.grandiftorum DC.)
4. Meibomia micfcauxii Vail.
Dry woods; occasional. Aug.-Sept. Eastern U. S. (Desmodium rotundifolium DC.; D. rotundifolium glabratum A. Gray.)
5. Meibomia ochroleuca (M. A. Curtis) Kuntze.
Mount Hamilton, Oct., 1882 (Ward). N. J. to Ga. and Mo. (Desmodium ochroleu- cum M. A. Curtis.)
6. Meibomia braoteosa (Michx.) Kuntze.
Woods along the upper Potomac; occasional. Aug.-Sept. Eastern U. S. (Des- modium bracteosum Michx.)
7. Meibomia canesoens (L.) Kuntze.
Thickets along the Potomac and Rock Creek; occasional. July-Sept. Eastern U.S. (Desmodium canescens DO.)
8. Meibomia panionlata (L.) Kuntze.
Woods and thickets; frequent. Aug.-Sept. Eastern U- S. (Desmodium panivu- latum DC.)
9. Meibomia laevigata (Nutt.) Kuntze.
Dry woods; occasional. Aug.-Sept. Eastern U. S. (Desmodium laevigatum DC.)
10. Meibomia viridiflora (L.) Kuntze.
Woods and thickets; occasional. Aug.-Sept. Eastern U. 8. (Desmodium viridi- florum Beck.)
11. Meibomia dillenii (Darl.) Kuntze.
Woods and thickets; common. Ana.-Sept. Eastern U. S. (Desmodium dillenii Darl.)
12. Meibomia canadensis (L.) Kuntze.
Low ground along the Potomac below Washington. Aug.-Sept. Eastern N. Amer.
(Desmodium cxmadense DC.)
13. Meibomia rigida (Ell.) Kuntze.
Dry soil; rare. Aug.-Sept. Eastern U. S. (Desmodium rigidum DC.)
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FLORA OF THE DISTRICT OF COLUMBIA. 187
14. Heibomia marylandica (L.) Euntze.
Dry woods and thickets; frequent. Aug.-Sept. Eastern 17. S. (Desmodium tnarylandicum Boott.)
15. Meibomia obtusa (Muhl.) Vail.
Dry soil; frequent. Aug.-Sept. Eastern U. S. (Desmodium obtmum DC.; D.
ciliare DC.)
Specimens of this species have been repotted erroneously from oiu£region as M.
eren^ola Vail.
14. LESFEDEZA Michx. Bush clover.
Plants annual; stipules ovate or lanceolate; calyx lobes ovate or oval, very obtuse.
Flowers pink or purple 1. L. stria ta.
Plants perennial; stipules narrowly linear, bristle-like, long-tapering; calyx lobes narrow, very acute.
Flowers all alike, perfect, in dense spikes or heads; corolla about as long as the calyx, whitish or yellowish, sometimes with a purple spot on the standard; pod not longer than the calyx lobes.
Peduncles longer than tbe leaves; leaflets oval to nearly orbicular, less than twice ag long as broad, loosely hairy beneath; flowers spreading in the spikes,
8. L. hirta.
Peduncles shorter than the leaves; leaflets oblong or elliptic, more than twice as long as broad, closely silky-hairy beneath; flowers erect or ascending in the spikes .. 3. L. capitata.
Flowers of 2 kinds, some of them petaliferous, in racemes or panicles, the petals purple, much longer than the calyx, the others mostly without petals, fertile, in small sessile clusters or mixed with the others; pods much longer than the calyx lobes.
Peduncles all or nearly all shorter than the leaves, or the flower clusters sessile.
Leaflets densely woolly or velvety beneath, oval to oblong. Flower clusters all sessile or nearly so 4. L. stuvei.
Leaflets glabrous beneath or with closely appressed hairs.
Leaflets oval or oblong; flower clusters often stalked 6. L. frutescens.
Leaflets linear to linear-oblong; flower clusters all sessile or nearly so.
6. L. virginica.
Peduncles, at least most of them, longer than the leaves.
Stems with spreading hairs.
Stems prostrate or trailing; peduncles long and slender, nearly all of them longer than the leaves 7 L. procumbens.
Stems erect; peduncles short and stout, often shorter than the leaves.
8. L. nuttallli.
Stems glabrous or with closely appressed hairs.
Stems erect; stipules mostly 5-8 mm. long 9. L. violacea- Stems prostrate or trailing; stipules 2-5 mm. long ..10. L. repens.
1. Lespedeza stria ta (Thunb.) Hook. & Arn. Japan glover.
Dry woods and fields; often abundant. Aug.-Sept. Native of eastern Asia; exten- sively naturalized in eastern N. Amer.
2. Lespedeza hirta (L.) Horncm.
Dry fields and woods; frequent. Aug -Oct. Easter* U. S.
Lespedeza kirta oblongi/olia Britton has been collected in our region, and one collec- tion has been reported incorrectly as L. angnsti/olia (Pursh) Ell. Its inflorescence resembles that of L, kirta, but the leaflets are narrower and the pubescence appressed The plant has not been found in fruit and it has been surmised that it is a hybrid between L. hirta and L. angustifolin. If this is not the case the form is well worthy
of specific rank.
3. Lespedeza capita ta Michx.
Dry woods and fields; common. Aug.-Sept. Eastern V, S.
4. Lespedeza stuvei Nu:r.
Dry fields and woods; frequent . Aug-Sept. Eastern IT. S.
6. Lespedeza frutescens (L.) Ell.
Dry woods and fields: frequent. Aug.-Sept. Eastern U. 8. (L. stuvei of Ward's Flora, in part.)
6. Lespedeza virgiuica (L.) Britton.
Dry woods and fields; common. Aug.-CM. Eastern U. S- {L. reticuluta anrtusii- folio of Ward's Flora.)
Lespcdem sieboldii Miq., a Japanese species, with large flowers, was collected along a roadside near Riverdale, Sept., 1905 (House). Escaped from cultivation.
7. Lespedeza procumbens Michx.
Dry woods and fields; frequent. Aug.-Sept. Eastern U. S.
8. Lespedeza nuttallii Darl.
Dry woods; occasional. Aug.-Sept. Extern IT. S.
9. Lespedeza violacea (L.) Pcrs.
Dry woods and fields; frequent. Aug.-Sept. Eastern IT. S.
10. Lespedeza repens (L.) Bartr.
Dry woods and fields; common. July-Sept. Eastern U. 8.
15. VICIA L. Vetch.
Leaflets 1-A pairs, most of them 2 cm. wide or larger. Flowers large, wetaule or nearly so in the axils; leaflets and stipules toothed 1. V. narbonensis.
Leaflets more than 3 pairs in all or most of the leaves, less than 1 cm. wide.
Flowers sessile or nearly so in the axils of the leaves 2. V. angustifolia.
Flowers in long-stalked racemes.
Flowers 1-6 in each raceme, 4 mm. long or small or 3. V. tetrasperma.
Flowers more than 6 in most of the racemes, usually much more numerous, 7 mm.
long or larger.
Plants very hairy; flowers 1.5 cm. long or larger, violet; pods about J cm, wide.
4. V. villosa.
Plants glabrous or nearly so; flowers 1 cm. long or shorter, bluish white; pods 5-7 mm. wide 5. v. caroliniana.
1. Vicia narbonensis L. Fjiench vetch.
Well established in fields near Chevy Chase Lake. May-Juno, Native of Ear.;
cultivated and sometimes escaping.
Vicia fabn L , the broad bean, with largo entire leaflets, was collected in waste ground, Hyattsville, June, 1907 (Mrs. E. S. Steele). Native of Asia and Africa;
much grown for food in Eur., and rarely in N. Amer.
2. Vicia angustifolia L.
Fields and waste ground; frequent. Apr.-June. Native of Eur.; widely natur- alized in N. Amer.
Often reported from our region as V. saliva L., a species so far not found here.
3. Vicia tetrasperma (L.) Moench.
Fields and waste ground; occasional. May-July. Native of Eur, and Asia;
naturalized in eastern N. Amer.
Vicia hirs:tta (L.) Koch, with hairy 2-seeded pods, was collected near the Long Bridge, June, 18% (Meele). Native of Eur. and Asia;1 occasionally naturalized in N. Amer.
FLORA OF THE DISTRICT OF COLUMBIA 189
4 Vicia villosa Roth. Haiuy vetch.
Fields, roadsides, and waste ground; frequent, and thoroughly established. May- Sept. Native of Eur. and Asia; sometimes cultivated and escaping.
5. Vicia caioliniana Walt.
"Woods and thickets; frequent. Apr.-May. Eastern N. Amer.
* 16. LATHYRtTS L. Wild tea.
Leaflets mostly '1 or 3 pairs; flowers 2-8 ill the raceme... 1. L. myrtifolius.
Leaflets 4-6 pairs in most of the leaves; flowers usually 10-25 in the raceme.
2. L. venosus.
Lathyriis latifoliiu L., the everlasting pea, with only one pair of leaflets, was col- lected along a roadside near Soldiers' Home, June, 1897 {Kearney). Native of Eur.;
often cultivated for ornament and sometimes escaping.
1. Lathyrus myrtifolius Muhl.
Marshes along the Eastern liianch. July. Northern states, south to N. C. (L.
pahtsfris of Ward's Flora.)
2. Lathyrus venosus Muhl.
Low ground along the upper Potomac; frequent. May. Eastern N. Amer.