Q6 leguminos^:. (PULSE FAMILY.) 



++ 4-1- Caulescent, rather tall, leaf'/: leaflets 7 to 9-paired: racemes or spikes mostly 

 man t/- flowered : pod with a stipe equalling or exceeding the calyx. 



38. A. frigidus, Gray, var. Americanus, Watson. Subglabrous : 

 leaflets ovate- or elliptic-oblong: peduncles equalling tbe leaves: flowers 

 wbite: pod oblong, acute at each end, black-hairy or glabrous. — Bibl. Index, 

 i. 193. A. frigidus of Bot. King's Exp., Hayd. Rep. 1871, and Fl. Colorado. 

 In the mountains from Colorado to the Arctic regions. 



§15. Pod membranous, lanceolate-cylindric, straight, exsertly-stipitate, glabrous : 

 flowers rather large: leaflets few or almost none. 



39. A. lonchocarpus, Torr. Ashy-puberulent, glabrate : stem fistulous, 

 branched : leaflets filiform-linear, remote, the leaf sometimes reduced to the 

 flatteued-filiform rachis : racemes loosely many-flowered : flowers white, pen- 

 dent: pod very sharply acuminate at each end. — Pac. R. Rep. iv. 80. S. Colo- 

 rado to New Mexico and Utah. 



§16. Pod membranous or chartaceous, small, globose or ovate, inflated, sessile. — 

 Diffuse or procumbent, mostly small and slender: flowers small and usually few. 



40. A. microcystis, Gray. Ashy-pubescent, from a woody root : leaf- 

 lets ± to § pairs, oblong or oblong-lanceolate, obtuse : racemes '5 to 12 -flowered : 

 corolla violet or whitish : pod globose-ovate, 3 lines long, thin membranous, 

 gray-pubescent. — Proc. Am. Acad. vi. 220. W. Wyoming {Parry) and 

 Washington. 



41. A. ieptaleus, Gray. Nearly glabrous: leaflets 7 to 11 pairs, lance- 

 linear or oblong, often acute: peduncles 2 to 4-flowered : corolla white: pod ovate 

 or oval, 4 lines long, chartaceous, pnberulent. — Loc. cit. Colorado. 



42. A. jejunus, Watson. Dwarf minutely hoary-pubescent: stems 1 to 2 

 inches long, crowded, from a many-branching caudex, covered with numerous 

 imbricated stipules, which are membranous, sheathing, truncate and ciliate: 

 leaflets 4 to 7 paiis, linear: peduncles 2 to 3-flowered : corolla ochroleucous or 

 tinged with violet: pod gibbous dorsally, obtuse, 4 lines long, membranous, gla- 

 brous. — Bot. King's Exp. 173, t. 13. Bear River Valley, near Evanston 

 ( Watson). 



43. A. humillimTlS, Gray. Habit of the last, but much more dwarf and 

 condensed : steins scarcely an inch long, with the scarious coa/escent stipules imbri- 

 cate and petioles persistent and spinescent: leaflets 3 to 5 pairs, oblong, canescent, 

 with revolute margins: peduncles 1 to 3-flowered: corolla pale: pod ovate, 2 

 lines long, coriaceous, with a white pubescence. — F roc. Am. Acad. xii. 57. Often 

 choked in drifting sand. Mesa Verde, S. W. Colorado {Brandegee). 



§ 17. Pod coriaceous, shortly exseii-stipitate, straight, narrowly oblong, semi-cylin- 

 dric, the deeply concave ventral surface divided by the salient obtuse suture. 



44. A. biSUlcatUS, Gray. Strigulose-puberulent : stem over a foot high, stout: 

 /eaflets oblong, often narrower : flowers violet, in dense spike-like racemes, middle- 

 sized : calyx-teeth scarcely shorter than the tube. — Pac. R. Rep. xii. 42, t. 1. 

 From Colorado to Nebraska and the Saskatchewan. 



45. A. Haydenianus, Gray. Smaller, pubescence more cinereous: spike 

 elongated, virgate : flowers much smaller: calyx-teeth much shorter than the tube.- 

 corolla white, keel tinged with purple at the end: pod rugulose with transverse 

 veins; stipe not exceeding the calyx. — Proc Am. Acad. xii. 56. Colorado. 



