LEGUMINOS^E. (PULSE FAMILY.) 65 



Short-stipitate, 



Glabrous 50, 52 



Puberulent 49, 51 



Sessile, 



Glabrous 46, 47, 60 



Puberulent or pubescent. 



Stems a span or more high 56, 57, 58 



Cespitose 54, 55, 59 



Woolly or villous 33, 48 



Systematic Synopsis. 



13. Pod very woolly, short, turgid, coriaceous, incurved, sessile. Very soft- 

 woolly : stems short, prostrate, from a stout perennial root : flowers usually one 

 inch long, loosely subcapitate. 



33. A. Purshii, Dougl. Nearly acaulescent, rarely 6 inches high, canes- 

 cent with a long and dense woolly pubescence : leaflets lanceolate or oblong : 

 flowers ochroleucous, with the keel sometimes purplish. W. Wyoming to 

 California and Oregon. 



14. Pod membranous, inflated, globose, egg-shaped or semi-ovate, usually large, 



finely reticulated, glabrous or glabrate. 



* Annual: pod sessile, not mottled : flowers small, ochroleucous or purplish. Low, 

 leaflets linear or linear-oblong, gray with strigulose hairs. 



34. A. triflOFUS, Gray. Cinereous-pubescent, very much branched from 

 the base, branches ascending, 6 to 12 inches high : flowers 3 to 15: pod oval, 

 obtuse or acutish. PI. Wright, ii. 45. S. Colorado and southward into 

 Mexico. 



35. A. Geyeri, Gray. Somewhat simple, 3 to 6 inches high, subcanescent, 

 with an appressed hairy pubescence : leaflets glabrous above : flowers 3 to 5 : 

 pod ovate-lunate with an incurved acumination. Proc. Am. Acad. vi. 214. Wyo- 

 ming, Idaho, and W. Nevada. 



* * Annual or perennial : pod stipitate. 

 -- Pod mottled: stipe equalling the calyx: flowers few, rather small. 



36. A. pictus, Gray. Hoary with a loose silky pubescence : leaflets 3 to 

 7 pairs, narrowly linear or filiform, most of them usually abortive : pod ovoid, 

 scarcely pointed, pendent. Proc. Am. Acad. vi. 214. From Nebraska to 

 Idaho and New Mexico. In sandy places. 



Var. filifolius, Gray. Leaves usually imperfect ; leaflets very few, mostly 

 attenuated, the terminal one or the filiform rachis produced, persistent. Loc. 

 cit. 215. On the plains of Colorado and southward. 



-i- -t- Pod not mottled. 



H- Nearly stemless, few-flowered : leaflets 4 to 6-paired : pod with a very short 



stipe. 



37. A. megacarpus, Gray. Glabrous: leaflets broadly oval or ovate: 

 scape much shorter than the leaves : flowers ochroleucous or whitish : pod 

 ovate-oblong, acuminate, very obtuse at base. Loc. cit. 215. "Plains of 

 the Rocky Mountains" (Nuttatt). 



5 



