FLOWERING PLANTS AND FERNS OF ARIZONA 475 



65. Pods sessile or nearly so (70). 



70. Stems prostrate or procumbent; keel produced at a right angle 

 to the claws; pods more or less falcate (71). 

 71. Leaflets strigose or sericeous on both faces; pods 8 to 12 mm. 



long 26. A. soxorae. 



71. Leaflets glabrous or nearly so above (72). 



72. Lower face of the leaflets sparsely strigose; pods 15 to 18 



mm. long 24. A. humistratus. 



72. Lower face of the leaflets loosely pilose; pods 7 to 10 mm. 



long 25. A. HOSACKIAE. 



70. Stems not prostrate (or sometimes so in A. sileranus), often 



decumbent; keel not noticeably produced (or somewhat so 



in A. subcinereus) , rounded to acutish at apex (73). 



73. Pods strongly compressed, rather promptly dehiscent at 



maturity or if not so, then pendulous and glabrous (74). 



74. Corolla yellow, 12 to 14 mm. long; stems white-sericeous, 



erect or nearly so, somewhat woody at base; leaflets 



glabrate above, white-sericeous beneath; calyx cylin- 



dric, 6 to 9 mm. long; pods pendulous, glabrous, 



about 12 mm. long 27. A. albulus. 



74. Corolla white or purple; stems glabrous or strigose or, if 



sericeous, then the corolla not more than 9 mm. long 



(75). 



75. Terminal leaflet greatly elongate or represented by a 



prolongation of the rachis; stems slender, rushlike; 



calyx teeth one-fourth to one- third as long as the 



tube 2. A. episcopus. 



75. Terminal leaflet not greatly elongate and always with a 

 well-developed blade (76). 

 76. Pods pendulous, glabrous; calyx teeth about one-half 



as long as the tube 4. A. wingatanus. 



76. Pods not pendulous, strigose; calyx teeth two-thirds 

 as long as to nearly equaling the tube (77). 

 77. Plant green, sparsely strigose; stems rushlike; leaf- 

 lets glabrous above, linear-lanceolate; racemes 

 greatly surpassing the leaves; pods 6 to 7 mm. 



long 9. A. MOEXCOPPEXSIS. 



77. Plant grayish, densely strigose or sericeous; stems 



not rushlike; leaflets strigose on both faces, 



elliptic or oblong; racemes not or but little 



surpassing the leaves; pods 8 to 10 mm. long. 



10. A. SOPHOROIDES. 



73. Pods not strongly compressed, mostly inflated, indehiscent 

 or tardily and incompletely dehiscent (78). 

 78. Pubescence of the pods more or less spreading; leaflets 

 narrow, oblong or cuneate-oblanceolate, often retuse 

 (79). 

 79. Plant perennial, green, sparsely pubescent; stems strag- 

 gling or prostrate; pods greatly inflated, less than 

 twice as long as wide, often mottled. 



38. A. SILERANUS. 



79. Plant annual, grayish, copiously pubescent; stems de- 



cumbent to erect; pods moderately inflated, 2 to 3 

 times as long as wide, not mottled, somewhat 



falcate 42. A. sabuloxum. 



78. Pubescence of the pods, if any, closely appressed, strigose 

 or sericeous (80) . 



80. Corolla 10 to 15 mm. long; walls of the pods sub- 



coriaceous; plant perennial; leaflets usually obovate 

 or oblanceolate; pods 15 to 25 mm. long. 



32. A. GREENEI. 



80. Corolla not more than 8 mm. long; walls of the pods 

 membranous or papery; plants mostly annual (81). 

 81. Pods 3-angled, arcuate, about 15 mm. long. 



39. A. TRIQUETRUS, 



