FLORA OF THE DISTRICT OF COLUMBIA. 189 



4. Vicia villosa Rolli. Hairy vetch. 



Fields, roadsides, ami ■waste gi'ouud; frequent, and thoroughly established. May- 

 Sept. Native of Eur. and Asia; sometimes cultivated and escaping. 



6. Vicia caroliniana Walt. 

 Woods and thickets; frequent. Apr .-May. Eastern N. Amer. 



16. LATHYRUS L. Wild pea. 



Leaflets mostly 2 or 3 paii-s; flowers 2-8 in the raceme 1. L. myrtifolius. 



Leaflets 4-6 pairs in most of the leaves; flowers usually 10-25 in the raceme. 



2. L. venosus. 

 LatJujnis latifoUiis 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 Branch. July. Northern states, south to N. C. (L. 

 palustris of Ward's Flora.) 



2. Lathyrus venosus Muhl. 



Low ground along the upper Potomac; frequent. May. Eastern N. Amer. 



17. CLITORIA L. 

 1. Clitoria mariana L. Butterfly pea. 



Dry or moist ground; frequent. June-Aug. Southern states, north to N. J. 



18. GLYCINE L. 



1. Glycine apios L. Potato pea. 



Moist ground; occasional. July-Sept. Eastern N. Amer. {Apios tuherosa Moench; 

 A . apios MacM.) 



19. FALCATA Gmel. Hog peanut. 



Leaflets thin, mostly 1.3-5 cm. long; calyx about 4 mm. long; bracts small. 



1. F. comosa. 

 Leaflets firm, mostly 5-10 cm. long; calyx about C mm. long; bracts large. 



2. F. pitcheri. 



1. Falcata comosa (L.) Kuntze. 



Low thickets; frequent. Aug.-Sept. Eastern N. Amer. (Amphicarpa monoica 

 Ell.) 



2. Falcata pitcheri (Torr. & Gray) Kuntze. 



Low thickets; frequent. Aug.-Sept. Northern slates, south to Va. (Amphicarpa 

 pitcheri Torr. & Gray.) 



These two species are separated by no definite character, and by none that would 

 be considered important in related groups of the family. Pro1>ably both are forms 

 of one polymorphous species. 



20. GALACTIA P. Br. Milk pea. 



Stems glabrous or neai'ly so; leaflets glabrous beneath or with a few appressed hairs; 



pods only slightly hairy 1. G. regularis. 



Stems with short soft spreading hairs; leaflets soft-downy beneath; pods very hairy. 



2. G. volubilis. 



1. Galactia regularis (L.) B.S.P. 



Near Berwyn; reported from Suitland and Chain Bridge; rare. July-Aug. East- 

 ern U. S. 



2. Galactia volubilis (L.) Britton. 



Dry woods and fields; frequent. July-Sei^t. Eastern U. S. (G. mollis Nutt.) 



