s perennial stragalus (Tourn.) L. 
| z Calyx teeth longer them the tube; j5-6 mm. long, 
herbs with alternate odd-pinnate leaves and persistent stipules. 
Flowers rose-purple, yellow or whitish, in close racemes or spikes. Calyx 
cempanulate, 5-lobed, the lobes usually unequal. Corolla slender, the 
banner commonly exceeding the wings and keel, not markedly recurved; upper- 
most stamen free, the remaining 9 united imto a tube around the ovary. 
Pod various, either flattened or plump or even inflated, l-chambered or 
partly or wholly 2-chambered by the intrusion of one or both sutures. 
O Upper surface of leaflets glabrous, the lower hirsute 
4 or hirtellous 
3, Racemes borne upon peduncles 2-3 cm. long A. tenellus 
\~ 
4 Racemes borne upon peduncles 10-25 cm. long 
4 Flowers purple; pods pendulous, flattened > A. occidentalf 
4 Flowers yellow or whitish; pods ascending, 
® plump 
& Leaflets 3-5 mm. wide; flowers ascending; 
/O stems numerous, ascending A. arrectus 
Iss 
Leaflets 6-12 mm. wide; flowers spreading; 
jo stems few or solitary, erect Ae Mortoni 
\> 
© Both surfaces of leaflets hirsute or hirtellous 
& densely white-woolly ox Ae Spaldingii. 
2 Calyx teeth shorter than or subequal to the tube; 
& pods 10-15 cm. long, hirsute or hirtellous 
4 Pods ascending, 12-14 mme long; bracts 4-5 
Q mm. long i. Ae striatus 
4 Pods spreading or pendulous, 9-10 m. long} 
8 bracts 2-3 mn. long 
& Pods inflated, pubescent with short curved | 
/ohairs; leaflets oval, 5-6 mn wide 7, Ae microcysti 
Pods flattened, not markedly inflated, 
ae pubescent with stiff appressed hairs; 
\O\ leaflets oblong-lanceolate, 1-2 mm. wide 3 Ae Bourgovii | 
; 
J 
