64 LEGUMINOS^J. (PULSE FAMILY.) 



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



branous, incurved. 



27. A. pubentissinms, 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 a short 

 very closely oppressed 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 very closely oppressed pubescence : leaflets obovate or ovate : pod strongly 

 arcuate, thick, puberulent, ovate-lanceolate to lanceolate-linear. Includes A. 

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

 westward ; also southward into New Mexico. 



30. A. Farryi, 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 obcompressed 

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

 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 

 sJiort, 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 incurved, 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 man 1 ] 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 eqxialling 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 



