346 LEQUMINOSAE 



Pods linear, flattened, cnrved; leaves glabrous or glabrate ; corolla yellowish- 

 white; Ilniuboldt Co 48. A. umhraticus. 



Pods sessile or subsessilc, compressed or oylindric. 



Plants somewhat rush-like, the stems slender or wiry, caespitose or matted on 

 the root-crown, 3 to 8 inches high; leaflets 5 to 13; pods erect or 

 ascending; ranges and valleys east of the Sierra Nevada. 

 Pods flattened, the dorsal suture raised; corolla yellowish; racemes 1 or 



2-flowered; herbage canescent; Panamint Eangc 



49. A. panamintensis. 

 Pods cylindric or subcylindric, grooved dorsally; racemes mostly 3 to 8- 

 flowered. 

 Herbage silvery-silky; corolla-banner purple, the wings white; e. 



Inyo Co 50. A. calycosus. 



Herbage greenish, appressed-pubescent; corolla yellowish; Lassen 



and Modoc Cos 51. A. obscurus. 



Plants with leafy stems, not rush-like. 



Pods glabrous, reflexed, 2 to 214 lines long; racemes 3 to 6 inches long; 



Lake Co 52. A. clevelandii. 



Pods not glabrous. 



Pods erect or ascending, straight or nearly straight. 



Flowers capitate or in short (3 to 6 lines long) racemes; pods 

 2 to 3 lines long. 

 Stems slender, Va to 2 feet long ; herbage green, thinly strigu- 

 lose, the calyces not white-woolly. 

 Pods ovate, acute, subcylindric, strongly grooved dor- 

 sally; racemes capitate 53. A. lemmonii. 



Pods elliptic-oblong, obtuse, flattened, slightly grooved 



dorsally; racemes i/^ inch long 



54. A. lentiformis. 

 Stems stout, 2 to 4 inches long ; herbage white with a dense 



silky pubescence, the calyces white-woolly 



55. A. anstinae. 

 Plowers in racemes or spikes, these (% or) l^^ to 6 inches long. 

 Eacemes very dense or capitate; pods 4 to 6 lines long. 



Calyx-teeth linear-subulate; pods densely pilose; Lassen 



Co 56. A. agrestis. 



Calyx -teeth triangular; pods finely pubescent; Mono 



Co. to Modoc Co 57. A. mortonii. 



Racemes lax, or at least not dense ; pods white-shaggy, 6 to 10 



lines long; e. Mohave Desert 58. A. minthorniae. 



Pods reflexed or spreading, grooved dorsally. 

 Pods curved. 



Eacemes closely flowered, % to 3 inches long; east of the 

 Sierra Nevada. 



Pods shaggy-villous, 1 inch long 59. A. malacus. 



Pods densely tomentose, 6 to 8 lines long 



60. A. andersonii. 

 Eacemes loose, 2 to 4 inches long; pods strigulose, 1 line 



wide; central Sierra Nevada foothills 



61. A. congdonii. 

 Pods straight, strigulose, the ventral margin cord-like; Inyo Co. 



62. A. atratus. 



II. Annuals; pods not stipitate. 

 1. Pods elliptic-ovate or ovate, 2-seeded, strongly wrinTcled or ridged transversely ; flowers 



in short racemes or spikes. 



Pods erect, little exserted from the calyx 63. A. didymocarpus. 



Pods deflexed, well exserted from the calyx 64. A. gambelianus, 



S. Pods linear or nearly so (ohlong-ovate in no. 66), several to many-seeded, 

 not wrinkled transversely. 

 Flowers in racemes; pods compressed, curved, grooved dorsally, 2-ceUed; plants silvery or hoary- 

 pubescent; deserts 65. A. albens. 



Flowers commonly in small head-like clusters at the ends of the peduncles; plants green or at 

 least not strongly hoary-pubescent. 

 Pods not laterally compressed, completely or almost completely 2-celled. 



Pods oblong-ovate, straight, silvery-pubescent ; style ia fruit stout, straight, as long as 

 body of pod 66. A. breweri. 



