LEGUMLNOS^E. (PULSE FAMILY.) 67 



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

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

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

 rachis, persistent. 



46. A. pectinatus, 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: Jlowers 

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



13. 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. Wewberryi, Gray. Stems very short, crowded from a deep elon- 

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

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

 laterally compressed, subincurved. Proc. Am. Acad. xii. 55. A. Chamcduce, 

 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 sfcipitate. PL Wright, ii. 44. Colorado and New 

 Mexico. 



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

 narrow-oblong, subcuneate, refuse : 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. flexUQSUS, 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. Patterson!, Gray. Robust, a foot or two high, appressed-puberu- 

 leitf, 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 (1 to 2Q)-ovuled. 



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



leaves pinnate, with many leaflets. 



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

 ules dark-colored; leaflets 6 to 10 pairs, linear or narrowly oblong: pedun- 



