VoL. II.] PEA FAMILY. 301 
13. Astragalus lotiflorus Hook. Low Milk Vetch. (Fig. 2137.) 
Astragalus lotifiorus Hook. FI. Bor. Am. 1: 152. 1833. 
Phaca lotifiora T. & G. Fl. N. A. 1: 349. 1838. 
Astragalus elatiocarpus Sheld. Bull. Geol. Nat. Hist. Surv. 
Minn. 9:20. 1894. 
Villous-pubescent with white hairs, branched from the 
base, nearly acaulescent, or with stems 1/-3’ long. Stip- 
ules ovate, acuminate, 114’/-2’’ long; leaflets 7-15, oval or 
oblong, obtuse and sometimes mucronulate at the apex, 
narrowed at the base, 5’’-8’’ long; flowers yellow, 4’/-6/’ 
long, in rather dense short spikes; peduncles shorter than 
or equalling the leaves, sometimes very short; pod 1-celled, 
sessile, villous-pubescent, ovoid-oblong, coriaceous, some- 
what inflated, pointed, dehiscent, keeled along the straight 
dorsal suture. 
Prairies, Manitoba to Nebraska and Texas, west to Colo- 
rado and the Northwest Territory. June-July. 
14. Astragalus Missouriénsis Nutt. Missouri Milk Vetch. (Fig. 2138.) 
Astragalus melanocarpus Nutt. Fraser Cat. 
Name only, 1813. 
Astragalus Missouriensis Nutt. Gen. 2:99. 1818. 
Densely silky-canescent all over, tufted, 
branching from the base, 2’—5’ long. Stipules 
ovate-lanceolate, acute, 2//-4’’ long, leaflets 
7-21, elliptic or obovate, obtuse but sometimes 
mucronate at the apex, narrowed or rounded 
at the base, 3/’-5’’ long; flowers few, violet- 
purple, 5’’-9’’ long in loose heads or short 
spikes; pod 1-celled, sessile, acute, oblong, 
pubescent, dehiscent, coriaceous, circular in 
section, slightly keeled along the ventral 
suture, transversely wrinkled, about 1/ long. 
Prairies, Nebraska to the Northwest Territory, 
south to New Mexico. May-July. 
15. Astragalus Shortianus Nutt. Short’s 
Milk Vetch. (Fig. 2139.) 
Astragalus Shortianus Nutt.; T. & G. Fl. N. A. 1: 331. 
1838. 
Silvery canescent, nearly acaulescent, somewhat 
branched from the base. Stipules ovate, acutish, 
about 2/’ long; leaflets 9-15, elliptic or obovate, 
acutish at the apex, narrowed or rounded at the 
base, 5’’-9’’ long; flowers blue or violet, 7//-9// 
long; peduncles commonly shorter than the leaves; 
pod t-celled, sessile, coriaceous, 8-shaped in sec- 
tion, dehiscent at maturity, lanceolate-ovoid, pu- 
berulent, transversely wrinkled, strongly curved 
and beaked at the summit, 1/-1!4’ long. 
Prairies, Nebraska and Colorado, south to New 
Mexico. May-July. 
