470 



3. Plant and pods pubescent with relatively short appressed hairs, or gla- 

 brate (6). 

 6. Pods 20 mm. long or longer, 5 to 6 times as long as their greatest diam- 

 eter (7). 

 7. Pods 30 to 50 mm. long, very strongly arcuate, sometimes forming 

 almost a complete circle; calyx hairs mostly black. 



62. A. LAYNEAE. 



7. Pods 20 to 25 mm. long, moderately arcuate; calyx hairs white and 



black 64. A. ensiformis. 



6. Pods not more than 15 mm. long, 3 to 4 times as long as their greatest 

 diameter (8). 



8. Leaflets 6 to 10 times as long as wide; inflorescences loose, few- 



flowered; pods conspicuously veined; plant strigose or glabrate. 



48. A. BRANDEGEI. 



8. Leaflets seldom more than 3 times as long as wide ; inflorescences short, 

 rather compact, much surpassing the leaves; pods not con- 

 spicuously veined (9). 

 9. Plant silvery sericeous, the leaflets so on both faces; wing petals 



deeply notched 63. A. scaposus. 



9. Plant rather sparsely strigose, the leaflets glabrous above; wing 



petals not deeply notched 69. A. hypoxylus. 



Pods 1-celled, without a septum but with the ventral suture occasionally 



somewhat introverted (10). 

 10. Pods not more, usually less than 10 mm. long; leaflets seldom more than 

 10 mm. long (11). 

 11. Inflorescences little surpassing (usually shorter than) the leaves, loose, 

 very few-flowered, or the flowers solitary; herbage silvery-sericeous; 

 stipules large, connate, thin (12). 

 12. Keel conspicuously and sharply beaked (produced at a right angle 

 to the claws) ; caudex with long creeping branches ; leaflets 3 to 

 8 mm. long; calyx about 5 mm. long, the teeth subulate, longer 

 than the tube; pods asymmetrically obovoid and slightly falcate, 

 barely 10 mm. long, often mottled 30. A. sesquiflorus. 



12. Keel not beaked, obliquely truncate; caudex short-branched (the 



plant pulvinate) ; leaflets about 2 mm. long; calyx 2.5 mm. long, 

 the teeth triangular, shorter than the tube; pods ovoid-oblong, 



barely 3 mm. long 43. A. humillimus. 



11. Inflorescences usually much surpassing the leaves, compact, several- 

 to many-flowered; keel not beaked; pods ovod (13). 



13. Pubescence rather loose, harsh, not silvery; leaflets 4 to 6 mm. wide; 



bracts subulate, becoming strongly reflexed; peduncles about 15 

 cm. long; corolla 8 to 10 mm. long, dull red, at least when dry; 

 pods subglobose, not more than V/i times as long as their greatest 



diameter 11. A. troglodytus. 



13. Pubescence close, silvery-sericeous; leaflets about 3 mm. wide; bracts 

 lanceolate, not becoming strongly reflexed; peduncles less than 10 

 cm. long; corolla 7 to 8 mm. long, violet or (exceptionally) 

 whitish; pods oblong-ovoid, 2 or more times as long as their 



greatest diameter 29. A. gilensis. 



10. Pods 10 mm. long or longer (14). 



14. Walls of the pods thin, papery, mottled; plant glabrous throughout 

 or very nearly so; pods 25 to 35 mm. long, broadly oval, stipitate. 



33. A. ARTIPES. 

 14. Walls of the pods thicker, more or less coriaceous, not or only excep- 

 tionally mottled (15). 

 15. Pubescence of the pods long and spreading (16). 



16. Racemes much surpassing the leaves; leaflets 2 to 3 mm. wide; pods 

 usually strongly reflexed, sparsely villous at maturity, oblong, 



strongly falcate 31. A. desperatus. 



16. Racemes not or but slightly surpassing the leaves; leaflets 4 to 11 



mm. wide; pods not or only slightly reflexed, densely soft- 



villous at maturity, ovoid (17). 



17. Leaflets 3 to 7, white-sericeous; calyx 12 to 15 mm. long; 



corolla 20 to 30 mm. long; pods somewhat incurved at apex. 



19. A. NEWBERRYI. 



17. Leaflets 9 to 13, white-villous ; calyx 8 mm. long; corolla 12 to 

 15 mm. long; pods crescent-shaped 20. A. blyae. 



