The Flora of the Cayuga Lake Basin 275 



8. Medicago (Tourn.) L. 



a. Flowers blue-purple; pods spirally twisted; plant mostly erect. 1. M. sativa 

 a. Flowers yellow; pods coiled; plant mostly prostrate. 2. M. lupulina 



1. M. sativa L. Alfalfa. Lucerne. 



A weed in fields and by roadsides, in rich soil ; frequent. June-July. 

 Commonly cultivated, and frequently escaped. 

 Widely introduced in N. A. Native of Eu. 



2. M. lupulina L. Black Medick. Nonesuch. 



A weed of fields, roadsides, lawns, and cultivated grounds ; very common. 

 May-Sept. 



Widely naturalized in N. A. Native of Eurasia. 



When not in fruit, this plant is often mistaken for Trifolium procwnbcns or T. 

 dubium, but it has dentate stipules and much smaller flowers (2 mm. long) in 

 denser heads, and the peduncles are much longer than the leaves. 



9. Lotus (Tourn.) L. 



1. L. CORNICULATUS L. BlRD-FOOT TREFOIL. 



"Appeared in the turf on the Fiske-McGraw [Chi Psi] grounds, in bloom Aug. 1885" 

 (D.) ; near the greenhouses of the Agricultural College, 1921 (S. H. Burnham) , 

 and for several years after. 



N. S. to D. C. Adventive from Eurasia. 



[Amorpha L.] 

 [A. fruticosa L. False Indigo. 



An occasional escape from cultivation to roadsides, but apparently not established. 

 Native of s. and w. U. S.] 



10. Tephrosia Pers. 

 1. T. virginiana (L.) Pers. Catgut. Hoary Pea. 



Open woods and banks, in dry sandy noncalcareous soils ; rare. July. 

 Dry sandy soil, Junius (Sartwelll). 



S. N. H. to Minn., southw. to Fla., La., Ark., and Mex., particularly on the 

 Atlantic Coastal Plain. 



11. Robinia L. 



a. Branchlets and petioles viscid ; racemes crowded. [R. viscosa] 



a. Branchlets and petioles not viscid; racemes loose. 1. R. Pseudo-Acacia 



[R. viscosa Vent. Clammy Locust. 



"Escaped; at Aurora, a few shrubs near the R. R. track" (£>.!); but possibly 

 planted.] 

 1. R. Pseudo-Acacia L. Common or Black Locust. 



Escaped from cultivation and established in ravines and on hillsides, in the richer, 

 moderately dry soils ; frequent. June 1-15. 



Native from Pa. to Ga. along the mts., and in the Ozark Mts. 



12. Astragalus (Tourn.) L. 



a. Racemes dense; flowers 1.5 cm. long; calyx white-hairy; leaflets 3-5 cm. long, 

 narrowly ovate, blunt; pods imperfectly 2-celled. 1. A. canadensis 



a. Racemes looser- and fewer-flowered; flowers 1.2 cm. long; calyx dark-hairy; 

 leaflets 2 cm. long, oblong or oblanceolate, blunt or retuse ; pod 1-celled. 



2. A. neglectus 



