80 
Spring Flora of Oklahoma 
with long whitish hairs. Leaflets 15-31, oblong, or linear oblong. 
Stipules lanceolate or oval. Racemes short, several-many-flowered. 
Pod oblong, conic, fleshy, strongly wrinkled, its summit strongly 
curved. 
On hillsides. March-May. Oklahoma County. 
XII. ASTRAGALUS (Tourn.) L. 
Herbs, with odd-pinnate leaves, and purple, violet, white, 
or yellow flowers in spikes or racemes, or, rarely, umbellate 
or solitary. Stipules present. Petals clawed. Standard 
erect, ovate or oblong. Wings oblong. Keel obtuse, about 
equaling the wings. Stamens diadelphous. Anthers all 
alike. Pod sessile, dehiscent, 1-2-celled. 
Plants scapose, or very short-stemmed; pod curved, 8- 
shaped in cross-section. 1. A. Shortianus. 
Plant leafy-stemmed; pods 1-celled, small, transversely 
wrinkled. 2. A. gracilis. 
1. Astragalus Shortianus Nutt. Short’s Milk Vetch. Silvery 
canescent, somewhat branched from the base. Stipules ovate. Leaf¬ 
lets 9-15, elliptic or obovate. Flowers blue or violet. Peduncles 
shorter than the leaves. Pod 1-celled, sessile, coriaceous, 8-shaped 
in section, lanceolate-ovoid, puberulent, strongly curved and beaked. 
Plains and hills. May-July. Oklahoma and Cleveland counties. 
2. Astragalus gracilis Nutt. Slender Milk Vetch. Finely 
pubescent, simple or nearly so. Stipules ovate. Leaflets 7-21, nar¬ 
rowly linear to linear-oblong, scarcely 1" wide. Flowers purple in 
spike-like racemes. Pod 1-celled, pendent, ellipsoid, finely appressed- 
pubescent with white hairs. 
Prairies. May-June. Southwest part of State. 
XIII. OXYTROPIS DC. 
Herbs, nostly acaulescent, with odd-pinnate leaves, and 
racemose or spicate flowers. Petals clawed. Standard- 
erect, ovate or oblong. Wings oblong. Keel erect, shorter 
than or equaling the wings, its apex mucronate, acuminate 
or appendaged. Stamens diadelphous. Anthers all alike. 
Pod 2-valved, 1-celled, or more or less 2-celled by the in¬ 
trusion of the ventral suture. 
1. Oxytropis Lambert! Pursh. Stemless Loco or Crazy-weed. 
Silky pubescent, with appressed or silky hairs, acaulescent or nearly 
