LEGUMINOS^E. (PULSE FAMILY.) 67 



§ 18. Pod thick-cartilaginous with a subfleshy epicarp, subovate or oblong, turgid, 

 sessile, neither suture intruded, but both thick and prominent. — Perennial, a foot 

 high, stem and leaves rather rigid: leaflets near/// filiform, not jointed to the 

 rachis, persistent. 



46. A. peetinatus, Dougl. Ashy-puberulent, glabrate : branches striate, 

 angled : flowers white, the banner elongated : pod pendulous, glabrous, cuspi- 

 date, the dorsal suture very thick. — From Colorado to Nebraska and the 

 Saskatchewan. 



47. A- Grayi, Parry. Distinguished from the last by the broader leaflets, 

 quite strongly veined, and by the somewhat thinner ascending pod: flowers 

 light yellow. — Watson in Am. Nat. viii. 212. W. Wyoming (Parry). 



§ 19. Pod coriaceous, ovate or oblong, rarely cylindrical, turgid, not sulcate and 

 neither suture intruded. — Ours are perennials and the pods are sessile or 

 scarcely stipitate. 



* Nearly acaulescent, silvery-silky, large-flowered. 



48. A. Newberryi, Gray. Stems very short, crowded from a deep elon- 

 gated root : leaflets 3 to 7, either broad- or narrow-obovate, approximate : 

 peduncles few-flowered : corolla ochroleucous : pod villous, the broad point 

 laterally compressed, subincurved. — Proc. Am. Acad. xii. 55. A. Chamadure, 

 Gray, in part. On the borders of Utah, Arizona, and S. W. Colorado. 



* * Glabrous or pubescent, stems ascending or erect: pod very shortly stipitate or 

 sessile : calyx gray- or dark-pubescent. 



49. A. Fendleri, Gray. Glabrous or appressed puberulent, erect: leaflets 

 oblong or linear-oblong: racemes loosely purple flowered: pod straight, minutely 

 puberulent, very shortly stipitate. — PL Wright, ii. 44. Colorado and New 

 Mexico. 



50. A. Hallii, Gray. Subcinereous-pubescent, glabrate, ascending : leaflets 

 narrow-oblong, subcuneate, retuse : flowers violet, in a dense head-like raceme : 

 pod straight, glabrous, with stipe a line long. — Proc. Am. Acad. vi. 224. 

 Colorado to New Mexico. 



51. A. flexuosus, Dougl. Ashy-puberulent, ascending : leaflets oblong- 

 or cuneate-linear, obtuse or retuse: racemes mostly elongated, loose: corolla 

 white or purplish : pod cylindric, puberulent, straight or subincurved, stipe 

 very short but evident. — From Colorado to Nebraska and the Saskatchewan. 



52. A. Pattersoni, Gray. Robust, a foot or two high, appressed-puberu- 

 lent, sometimes glabrous : leaflets oblong, thickish : peduncles racemosely many- 

 flowered : corolla white, the keel sometimes purplish at the tip : pod glabrous, 

 abruptly contracted within the calyx, becoming somewhat stipe-like. — Loc. cit. xii. 

 55. S. W. Colorado and Utah. 



§ 20. Pod vetch-shaped, flattened or less compressed, straight, margined by the 



nerve-like sutures, coriaceous or chartaceous, sometimes stipitate. — Perennials, 



with the leaves pinnate with many or few leaflets, or in some species simple. 



* Flowers in peduncled racemes or spikes: pod many (7 to 20)-ovuled. 



*- Stipules connate, at least the lower ones : pod exsert-stipilate. Caulescent : 



leaves pinnate, ivith many leaflets. 



53. A. multiflorus, Gray. Somewhat glabrous : stems slender : stip- 

 ules dark-colored; leaflets 6 to 10 pairs, linear o\ narrowly oblong: peduu- 



