474 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



57. Leaflets narrowly linear or nearly filiform; pods pendu- 

 lous (58) . 

 58. Terminal leaflet not much longer than the others; 



pods flattened laterally 6. A. coltoni. 



58. Terminal leaflet much longer than the others, often 

 appearing as a continuation of the rachis; pods not 

 flattened laterally (59). 

 59. Stipe of the pod considerably surpassing the calyx; 

 corolla 15 mm. long or longer. 



22. A. LONCHOCARPTJS. 



59. Stipe of the pod much shorter than the calyx, 

 stout; corolla 12 mm. long_ 23. A. kaibensis. 

 56. Pods sessile or nearly so (60) . 



60. Leaflets 9 to 15, the terminal one not rachislike; stems 

 not rushlike; inflorescence many-flowered, usually 

 rather dense; pods erect or ascending, not more 



than 15 mm. long 8. A. confertiflorus. 



60. Leaflets 3 to 9, the terminal one often appearing like a 

 continuation of the rachis, or the upper leaves re- 

 duced to a rachis; stems rushlike, slender, flexuous; 

 inflorescence few-flowered, open; pods more or less 

 pendulous, at least 18 mm. long (61). 

 61. Pods strigose, about 10 times as long as their great- 

 est diameter 5. A. junciformis. 



61. Pods glabrous or glabrate, not more than 7 times 

 as long as their greatest diameter (62) . 

 62. Corolla 12 to 15 mm. long; pods 3 to 4 cm. long, 

 lance-oblong, acuminate at apex. 



2. A. episcopus. 



62. Corolla 8 mm. to 10 mm. long; pods 2 to 3 cm. 



long, oblong, obtuse, and apiculate to acute at 



apex 3. A. lance arius. 



51. Length of the pods not more than 3 times the greatest diameter (63). 

 63. Walls of the pod coriaceous, becoming almost woody at maturity, 

 the pods sessile or subsessile, glabrous or nearly so (64) . 

 64. Stems not more than 20 cm. long, the plant normally subacau- 

 lescent; calyx cylindric; corolla purple, drying violet. 



14. A. REMULCUS. 



64. Stems 30 cm. long or longer; calyx cylindric-campanulate; 



corolla whitish, the keel often tipped with purple. 



47. A. PRAELONGUS. 



63. Walls of the pod thinner, at most subcoriaceous (65) . 



65. Pods stipitate, sometimes (in A. preussii) barely so and the 



stipe very thick (66). 

 66. Flowering stems borne at intervals on long, slender, creeping 

 rootstocks; leaflets narrowly linear or nearly filiform, the 

 terminal one greatly elongate, the lateral leaflets sometimes 

 wanting or the leaf reduced to a rachis; pods thin-walled, 

 conspicuously mottled with red-brown blotches. 



34. A. CERAMICUS. 



66. Flowering stems not borne at intervals on long, slender, 



creeping rootstocks; terminal leaflet like the others and not 



greatly elongate (67) . 



67. Pods conspicuously mottled with red-brown blotches, 30 to 



40 mm. long 33. A. artipes. 



67. Pods not or not conspicuously mottled (68) . 



68. Plant strigose, usually canescent; stems rather slender, 

 usually decumbent or procumbent; leaflets rather thin. 



32. A. greenei. 

 68. Plant glabrous or nearly so; stems stout, erect or ascend- 

 ing; leaflets thickish (69). 

 69. Stipe of the pod 2% to 3 times as long as the calyx. 



45. A. AMPULLARIUS. 



69. Stipe of the pod not longer than the calyx, sometimes 

 very short and thick 46. A. preussii. 



