64 LEGUMINOS^I. (PULSE FAMILY.) 



* Annual or biennial, many-stemmed : flowers rather small: pod inflated, mem- 



branous, incurved. 



27. A. pubentissimus, Torr. & Gray. Dwarf, hirsute-canescent : leaf- 

 lets oblong or obovate : flowers few : pod villous, ovate-lunate, strongly in- 

 curved. — Colorado and W. Wyoming. 



* * Perennial, short-stemmed or scarcely caulescent, usually prostrate or matted : 

 flowers rather large : pod thick-coriaceous, obcompressed-triangular, trans- 

 versely rugulose. 



28. A. MiSSOUriensis, Nutt. Subcaulescent, hoary-silky with u, short 

 very closely appressed pubescence : peduncles scape-like, capitately or spicately 

 few-flowered: pod nearly straight, blackish, elliptic. — From New Mexico to 

 Nebraska and the Saskatchewan. 



29. A. Shortianus, Nutt. Usually subacaulescent, silky-canescent with 

 a eery closely appressed pubescence : leaflets obovate or ovate : pod strongly 

 arcuate, thick, puberulent, ovate-lanceolate to lanceo/ate-Iuwar. — Includes A. 

 cyaneus of most of the western reports. From Colorado to Nebraska and 

 westward ; also southward into New Mexico. 



30. A. Parryi, Gray. Stems short, villous, with loose spreading hairs: 

 flowers loosely subcapitate, whitish or yellowish, the keel tinged with purple : 

 pod arched or at length circinate, pubescent, oblong-lanceolate, strongly obcompressrrl 

 and rugulose, both sutures sulcately impressed, contiguous. — Am. Jour. Sci. H. 

 xxxiii. 410. From Colorado to N. W. Texas. 



31. A. iodanthus, Watson. Canescent with an appressed hairy pubes- 

 cence, or usually nearly glabrous with scattered hairs upon the petioles and 

 margins of the leaves : stems decumbent : leaflets obovate or orbicular : spikes 

 slwrt, dense : pod strongly arcuate or hamate, nearly glabrous, mottled, linear-oblong, 

 irregularly folded. — Bot. King's Exp. 70. Colorado (Coulter) and Nevada. 



32. A. glareosus, Dougl. Depressed, villous-silky with white incumbent 

 hairs: flowers 3 to 6 : pod incurred, silky-pubescent becoming subglabrous, oblong- 

 ovate, attenuate above. — Wyoming and S. Idaho. 



Series II. Pod one-celled, neither suture being inflexed or the ventral more 



intruded than the dorsal. — Phaca, L. 

 A. Leaves pinnate with many or rarely with few or abortive leaflets, or simple. 



Artificial Key. 



Leaflets prickly pointed and rigid, persistent . No. 61 



Leaflets not prickly pointed. 

 Pod inflated, 

 Stipitate, 

 Mottled . . .... ... 36 



Not mottled. 



Stipe very short 37 



Stipe equalling or exceeding the calyx 38, 39 



Sessile. 



Annual; pod 7 to 12 lines long 34,35 



Perennial : pod 2 to 4 lines long 40, 41, 42, 43 



Pod coriaceous or cartilaginous, not bladdery inflated, 

 Exsert-stipitate, 



Deeply sulcate • 44, 45 



Not deeply sulcate ••»••• 53 



