440 BOTAIDT. 



tute ; pod viUous, 9-10" long, ovate-lunate, strongly incurved, suloate on the back with a sUght intro- 

 flexion of the suture.— Colorado, (Nuttall.) 



» * Perennial, short-stemmed or scarcely caulescent, usually prostrate or matted ; flowers rather 



large, shortly pedioelled, mostly violet ; leaflets oWong, elliptic or obovate. Pod thick-ooriaoeous, 



obeompressed or obcompressed-triangular, transversely rugulose. 



56. A. MISSOURIENSIS, Nutt. Subcaulesoent, hoary-silky with a short very closely appressed pubes- 

 cence; peduncles scapelike, capitately few-flowered or spicately 8-14-flow6red ; calyx-teeth about half- 

 shorter than the cyliudrio tube; corolla bright violet, (or rarely white;) pod about 1' long, nearly 

 straight, blackish, elliptic— From the Saskatchewan to Nebraska and New Mexico. 



57. A. Shortianus, Nutt. Usually subacaulescent, silky-canescent with a very closely appressed 

 pubescence ; leaflets obovate or ovate, 7-10" long ; peduncles scapelike, few-many-flowered, usually 

 shorter than the leaves; calyx i' long, cylindric, teeth half-shorter than the tube ; corolla violet or blue ; 

 immature pod 1^-2' long, ovate-lanceolate, pointed and strongly arcuate, thick, puberulent.— N. Colorado. 

 Var. (?) MINOR has smaller leaflets and the pod oblong- or lanceolate-linear, the dorsal suture deeply in- 

 truded, carinate ventrally.— W. Texas and New Mexico to Nebraska and Colorado. 



58. A. Parryi, Gray. Stems short, prostrate ; villous with loose spreading hairs ; peduncles rather 

 short ; flowers 6-10, loosely subcapitate, 6-8" long, whitish or yellowish, the keel tinged with purple ; 

 calyx-teeth half-shorter than the cylindric tube ; pod pubescent, oblong-lanceolate, 1' long or more, 

 arched or at length circinate, strongly obeompressed and rugulose, both sutures sulcately impressed, con- 

 tiguous. — Colorado to N. W. Texas. 



59. A. lODANTHUS, S. Watson. Subglabrous ; spikes dense. See page 70. 



60. A. Bbckwithii, T. & G. Subglabrous ; raceme loose ; pod short-stipitate. See page 71. 



61. A. GLARBOSUS, Dougl. Depressed, villous-silky with white incumbent hairs ; flowers 3--6, nar- 

 row, 9-12" long, on peduncles not exceeding the leaves, bright violet ; calyx-teeth one-third as long as 

 the long-cylindric tube; pod (immature) oblong-ovate, attenuate above, incurved, silky-pubescent, " be- 

 coming subglabrous."— S. Idaho ; "Wyoming. 



Series 11. PHACA, L. Pod 1-celled, neither suture being inflexed or the ventral more intruded than 

 the dorsal. J 5 17-27. 



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

 § 17. EEIOCAEPI. Pod very woolly, short, turgid, coriaceous, more or less incurved, acuminate or 

 pointed, sessile. Very soft-wooUy; stems short, prostrate, from a stout perennial root; flowers 

 usually 1' long, loosely subcapitate ; calyx long-cylindric. 



62. A. ESTFLEXUS, Dougl. Cinereous-hoary with loose subvillous wool; stems 6-12' long, diffuse- 

 procumbent ; leaflets oblong ; flowers 1' long, bright-purple, the keel little exceeding the loose slender 

 setaceous calyx-teeth ; pod ovate-oblong, very woolly when young, becoming somewhat naked, strongly 

 incurved, obeompressed, both sutures impressed, the ventral one more so. — Idaho ; Washington Territory. 



63. A. ERIOCARPUS, S. Watson. Pubescence rather hirsute-silky. See page 72. 



64. A. PuRSHU, Dougl. Flowers ochroleuoous ; leaflets lanceolate or oblong. See page 72. 



65. A. Utahbnsb, T. & G. Flowers dark-purple ; leaflets subrounded. See page 72. 



§ 18. OOCARPI. Pod chartaceous-coriaceous, ovate, inflated, sessile, glabrous, ventral suture in- 

 truded, the dorsal obsoletely so. Glabrate, perennial, erect, leafy ; stipules free, distinct ; leaflets 

 oblong and oval, sometimes retuse ; flowers many in a spikelike raceme, white or whitish, J' long ; 

 calyx short ; pod erect, not over 1' long. 



66. A. COOPBRI, Gray. Leaflets oblong ; calyx dark-pubescent, teeth subulate ; pod ovate-globose, 

 sub-obcompressed, slightly sulcate on both sides, cavity webby. — W. New York to Wisconsin. 



67. A. oocaepus. Gray. 4-6° high ; leaflets oval, rather small, thickish ; flowers spreading, in a 

 rather loose raceme ; calyx whitish-puberulent, teeth very short ; pod oblong-ovate, acute, slightly sul- 

 cate only ventrally and that suture introflexed, glabrous within. — S. CaUforuia. 



§ 19. INFLATI. Pod membranous, inflated, globose, egg-shaped or semi-ovate, usually large, finely 

 reticulated, glabrous or glabrate, neither suture inflexed or rarely the ventral only and slightly. 



* Annual ; pod sessile, not mottled ; flowers small, ochroleuoous or iDurplish. Low ; leaflets linear 

 or linear-oblong, gray with strigulose hairs. 



68. A. TRiPLOEUS, Gray. Very much branched from the base ; flowers 3-15 ; pod oval, obtuse or 

 acutish, 7-12" long. — Arizona, Mexico. 



69. A. Gbybki, Gray. Flowers few, yellowish-white ; pod ovate-lunate. See pag« 72. 



* * Boot perennial, (annual ? in A. pictus ;) pod mottled, short-stipitate, the stipe equaling the 

 calyx ; flowers few, rather small, light-colored, keel with the inflexed apex somewhat produced. 



