176 ROSE ORDER 



(n) Pods more or less hairy; flow- 

 ers 3-15, yellowish or purp- 

 lish; leaves linear to ovate A.trif.orus 

 y. Pods not inflated 



(x) Pods with an incomplete cross wall, 

 caused by the intrusion of the 

 lower midrib 

 m. Pods long-stalked 



(m) Pods smooth; leaves linear to 

 lance-oblong; flowers white, 

 or tinged with violet 

 r. Pods papery; leaflets 7-13, 

 linear to lance-oblong; flow- 

 ers white, tinged with violet A. abort ginum 

 s. Pods' leathery; leaflets 13-25, 



obovoid; flowers yellowish A. Beckwithii 

 (n) Pods black-hairy; leaves ob- 

 long to oval; flowers yel- 

 lowish, tinged with purple A. Macounii 

 n. Pods not at all or scarcely stalked 

 (m) Wall of pod thin, soft and pa- 

 pery 

 r. Clusters many-flowered ; flow- 

 ers purple; leaves oval to 

 oblong A. elegans 



s. Clusters few-flowered ; flowers 

 white or yellowish, purple- 

 tinged ; leaves linear A. Brandegei 

 (n) Wall of pod thick, stiff and 

 leathery or woody 

 r. Stems tall, 1-4 ft., smooth ; 

 leaflets oblong to ovate ; flow- 

 ers white ; pods tapering to 

 a short stalk-like base A. P after sonii 

 s. Stems low, tufted, 1-8 in. high ; 

 leaves gray-hairy or silky 

 (r) Pods with long shaggy 

 wool 

 h. Flowers purple; leaves 



nearly round, woolly A. utahensis 

 i. Flowers yellowish 



