282 



LEGUMINOSAE (PEA FAMILY) 



Flowers ochroleucous ..... 



Flowers violet ....... 



Pods coriaceous, strikingly woolly-pubescent. 

 Leaflets 9-17. 



Leaflets oblong; flowers ochroleucous . 

 Leaflets suborbicular; flowers purple 

 Leaflets 3-7; flowers ochroleucous .... 



Pods strongly inflated, papery (PHACA). 



Stems evident, usually more than 1 dm. long (except in No. 40). 

 Leaflets long-linear or filiform; pods mottled 

 Leaflets short-linear to suborbicular. 

 Pods quite glabrous, or glabrate. 

 Pods sessile; stems low. 



Leaflets oblong to linear 



Leaflets elliptic to orbicular 



Pods stipitate. 



Stemless or nearly so 



Stems tall 



Pods pubescent. 



Stems glabrous 



Stems hirsute. 



Plant perennial ....... 



Plant annual ........ 



Stems wanting or very short, or prostrate-spreading. 

 Dwarf or prostrate; leaflets short (4-8 mm.). 



Pods conspicuously mottled ...... 



Pods not mottled. 



Peduncles 1-3-flowered ...... 



Peduncles 5-1 2-flowered 



More robust, sometimes caulescent. 



Leaflets glabrous above ....... 



Leaflets pubescent on both faces. 



Racemes sessile, often elongating in fruit 

 Raceme on a peduncle surpassing the leaves 



32. A. Parryi. 



33. A. glareosus. 



34. A. Purshii. 



35. A. utahensis. 



36. A. Newberryi. 



37. A. ceramicus. 



38. A. Eastwoodiae. 



39 A. artipes 



40. A. megacarpus. 



41. A. americanus. 



42. A. Wetherillii. 



43. A. cerussatus. 



44. A. Geyeri. 



45. A. jejunus 



46. A. humillimus. 



47. A. microcystis. 



48. A. leptaleus. 



49. A. elatiocarpus. 



50. A. lotiflorus. 



SERIES III 







Leaves pinnate or in No. 60 partly simple. 



Pods conspicuously bisulcate ventrally (DIHOLCOS). 



Flowers purple or violet 51. A. bisulcatus. 



Flowers white or ochroleucous. ...... 52. A. Haydenianus. 



Pods various but not bisulcate. 



Pods with a thickened fleshy epicarp; leaves pectinately lobed 

 rather than pinnate, the leaflets being obscurely articu- 

 lated (CTENOPHYLLUM). 



Divisions of the leaves narrowly linear; pods pendent . . 53. A. pectinatus. 

 Divisions of the leaves broadly linear; pods ascending. . 54. A. Grayi. 

 Pods without fleshy epicarp and leaflets with evident articula- 

 tions. 

 Pods coriaceous or woody; often flattened dorsally. 



Calyx cylindrical; flowers large (refer to group Xylophacos}. 

 Calyx campanulate; flowers small. 



Corolla yellow; calyx-tube as long as its lobes (GNEMI- 



DOPHACOS) 55. A. flaviflorus. 



Corolla purple; calyx-tube longer than its lobes (MI- 



CROPHACOS). 



Stems yirgate; pods concave dorsally . . . 56. A. gracilis. 

 Stems diffuse; pods barely flattened dorsally . . 57. A. microlobus. 

 Pods membranous, usually flattened laterally and the sutures 



prominent; in Nos. 69, 70, and 71 nearly terete. 

 Leaves spinulose-tipped; pods 1-2-seeded (KENTRO- 



Flowers ochroleucous, or tinged with violet; herbage 



somewhat hoary-pubescent ..... 58. A. viridis. 

 Flowers purple; herbage sparsely hirsute . . .59. A. aculeatus. 

 Leaves not spinulose-tipped; pods several-seeded (HO- 



MALOBUS). 

 Leaves simple, or rarely 3-foliolate in part (see also 



No. 67). 

 Raceme several-flowered ...... 60. A. caespitosus. 



Raceme 1-3-flowered 61. A. simplicifolius. 



Leaves pinnate, usually with many leaflets. 

 Pods compressed; stipules connate. 



Pods stipitate 62. A. tenellus. 



Pods sessile. 



Plants low (7-20 cm.), usually tufted. 



Leaflets elliptic to linear, glabrate or minutely 



pubescent. 

 Leaves and pods more or less pubescent . 63. A. campestris, 



