PEA FAMILY 345 



Leaves silvery with a close dense appressed pubescence; pods 1 or 2 -celled; leaves and 

 peduncles tufted on the short branches of the root-crown; deserts....26. A. neivierryi. 



S. Pods pubescent or villous or glabrous, not resembling tuhite pellets of wool. 



a. Dorsal and ventral sutures both externally prominent, forming a thick cord-like ridge ; pods 



coriaceous, strongly rugulose. 



Pods hoary-pubescent, thin-walled, non-stipitate ; biennial 27. A. mohavensis. 



Pods glabrous, fleshy-coriaceous, thick or subcylindric, short (V^ to 1 inch long) ; perennials. 

 Pods stipitate ; leaflets mostly 11 to 21. 



Stipe not longer than calyx; pods linear-oblong, curved; leaflets narrowly linear; corolla 



white; Kern Co. region 28. A. pachypus. 



Stipe mostly longer than calyx; pods elliptic in outline, very thick or turgid, or some- 

 what subglobose, not curved; leaflets oblong; Siskiyou Co 29. A. pacificus. 



Pods not stipitate; leaflets 5 or 7, linear, very remote 30. A. serenoi. 



b. Dorsal suture not prominent and not cord-like externally (except in A. bicristatus), in 2-celled 



pods often inturned and forming a groove ; pods not strongly rugulose. 



Pods retrorsely and densely imbricated when mature ; coast line species. 



Pods 1-celled; style persistent 31. A. pycnostachyus. 



Pods incompletely 2-celled; upper portion of style deciduous ^2. A.brauntonii. 



Pods erect, spreading or reflexed, but not retrorsely imbricated. 

 Pods 1-celled, glabrous, subglabrate or merely puberulent. 



Pods strongly obcompressed, strongly or weakly curved, % to l^i inches long. 

 Pods cristate fore and aft by the prominent sutures. 



Leaflets usually remote, sparsely strigose; pods stipitate; San Gabriel and 



San Bernardino mountains 33. A. bicristatus. 



Leaflets approximate, silky-canescent ; pods not stipitate; northern Sierra 



Nevada 34. A. webberi. 



Pods not cristate, not stipitate. 



Leaflets remote, linear, minutely strigulose, ^ to IVs lines wide; calyx-teeth 



% to 14 as long as the tube 35. A. casei. 



Leaflets approximate, obovate, glabrous or subglabrous, 1 to 2^2 lines wide; 



calyx-teeth i/^ to % as long as the tube 36. A. iodanthus. 



Pods not obcompressed, stipitate. 

 Pods subcylindric. 



Pods more or less curved, % to 1 inch long; leaflets obcordate; Alpine Co. to 



Plumas Co 37. A. gibbsii. 



Pods straight, 1 to 1% inches long; leaflets oblong; Siskiyou Co 



38. A. collinus. 

 Pods strongly flattened laterally (except one form in A. trichopodus) ; leaflets 

 linear or oblong. 

 Pods equilateral, 2 to 3 lines wide, the sides parallel. 



Pods linear or linear-oblong ; Siskiyou Co. to Lassen Co. and inner ranges 

 of S. Cal. 



Pods glabrous; stipe filiform; stems erect 59. A. filipes. 



Pods pubescent; stipe tapering; stems straggling AO. A. inversus. 



Pods oblong-oblanceolate ; inner ranges, San Luis Obispo Co. to Los 



Angeles Co 41. A. antisellii. 



Pods inequilateral, 3 to 4 lines wide, the ventral suture straight or nearly so, 

 the dorsal strongly curved; immediate coastal region, Santa Barbara 



Co. to Orange Co 42. A. trichopodus. 



Pods completely or incompletely 2-celled. 

 Mature pods obcompressed. 



Pods strongly obcompressed, strongly arcuate, sessile ; deserts. 



Herbage glabrous; pods glabrous, 10 to 11 lines long; e. Mohave Desert 



43. A. cimae. 

 Herbage densely pubescent, or canescent; pods hairy, 1 to 2^^ inches long; 



Mohave Desert and Inyo Co. deserts 44. A. layneae. 



Pods somewhat obcompressed, oblong, curved, pubescent, stipitate, the stipe 3 to 

 4 lines long. 

 Plants congested, the stems woody at base ; herbage white-tomentulose ; corolla 



white ; insular 45. A. nevinii. 



Plants openly branching, the stems not woody at base; herbage more or less 



strigulose; corolla purple; Inyo Co 46. A. inyoensis. 



Mature pods not strongly obcompressed (slightly so in A. austinae and A. mortonii). 

 Pods stipitate, usually grooved dorsally, glabrous ; stipe % to 1 line long. 



Pods 3-sided or 3-angled, straight or only slightly curved; leaves canescent; 

 deserts 47. A. tricarinatus. 



