LEGUMINOSiE 73 



corolla white, standard longer than the other petals. Waste places, fairly 

 common, introduced, Man.-Alta. 



9. AMPHICARPA. Hog Pbanttt. 



Flowers of two kinds, — small white or violet perfect flowers in 

 axillary racemes, and solitary apetalous fertile flowers on flliform 

 creeping braneh.es from 

 the base and generally 

 underground; calyx 4 or 

 rarely 5-toothed; sta- 

 mens diadelphous; pods 

 of the upper flowers 

 curved and stalked, those 

 of the lower pear-shaped, 

 1-seeded. ~ Low slender 

 perennial herbs with pin- Fig. 57. — Amphicarpa monoica, showing a 

 nately 3-foliate leaves. leaf, and a cleistogamous flower at a. 



1. A. mon6ica, (L.) Ell. 



Leaflets thin, broadly ovate, acute at the apex and rounded at the base ; 

 upper flowers purplish white in nodding racemes; pods of the perfect flowers 

 pubescent along the margin. Rich moist woods. Red River Valley. 



10. ASTRAGALUS. Milk Vetch. 



Calyx 5-toothed; corolla papilionaceous, the standard long and 

 narrow with reflexed sides ; keel blunt; stamens diadelphous; pod 

 several-seeded, often turgid, and frequently apparently 2-ceUed 

 by the intrusion of one or both sutures. Perennial herbs with odd- 

 pinnate leaves, and flowers in spikes or racemes. A very large 

 genus, and impossible to determine all the species without matured 



pods. 



* Pod sttoottlent and indehiscent. 



1. A. caryocarpus, Ker. Ground Plum. 



Tufted, ascending, minutely pubescent with appressed hairs; flowers 

 purple, in a short spike; fruit glabrous, ovoid-globular, with very thick walls, 

 and completely divided into 2 cells. Prairies, common, Man.-Alta. 



** Pod det and dehiscent. 

 t Pod completely 2-celled. 



2. A. canadensis, L. 



Erect, 1-3 ft. high, somewhat pubescent, leaflets 21-27; flowers yellowish 

 white, in a long, dense spike; pod sessile, erect, very slightly grooved on the 

 back, almost straight and pointed. Light soil, common, Man.-Alta. 



