64 LEGUMINOS^. (PULSE FAMILY.) 



* Annual or biennial, man^-stemmed : Jlowers rather small: pod inflated, meyn- 



branous, incurved. 



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

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

 curved. — Colorado and W. Wyoming. 



* * Perennial, short-stemmed or scarce! // caulescent, nsualhj prostrate or matted : 

 /lowers rather large : pod thick-coriaceous, obcompressed-triangidar, trans- 



verseli/ riigulose. 



28. A. Missouriensis, Nutt. Subcaulescent, hoary-silkij with a short 

 verij closeli) appressed pubescence : peduncles scape-like, capitately or spicately 

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

 Nebraska and the Saskatchewan. 



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

 a very closely appressed 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. Parryi, Gray. Stems short, villous, with loose spreading hairs: 

 floivers 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. ii. 

 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 

 short, 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 subglahrous, 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 ivithfew or abortive leaflets, or simple. 



Artificial Key. 



Leaflets prickly pointed and rigid, persistent No. 61 



Leaflets not i>rickly pointed. 

 Pod inflated, 

 Stipitate, 



Mottled o . . . 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 



