WOOTOKT AND STANDLEY FLOfeA OF NEW MEXICO. 359 



Lower suture intruded as the result of dorsoventral flattening; pods cori- 

 aceous or woody. 

 Corolla yellow; flowers small. (Cnemidophacos.) 



22. A.flaviflcfrus. 

 Corolla at least partly purple; flowers large. (Xylophacos.) 



Pods densely long-hairy; only the keel of the corolla purple. 



23. A. newherryi. 

 Pods short-hairy or glabrous; corolla entii-ely purple. 



Flowers small, about 8 mm. long (subcapitate). 



24. A. accumbens. 

 Flowers large, 15 mm. long or more. 

 Pods short and nearly straight (dorsal suture not intro- 

 verted; mature pod sometimes laterally flattened). 



25. A. missouriensis. 

 Pods longer, strongly curved upward. 



Pods obtuse at the base, the dorsal sutiire strongly in- 

 troverted 26. A. shortianus. 



Pods acute at both ends, the dorsal suture usually not 



much inflexed 27. A. ampMoxys. 



Neither suture of the pod introverted (except sometimes in A. subdnereus and 

 A. sonorae). 

 Pods strongly bisulcate ventrally, parallel to the suture. 



Flowers pin-ple or violet, at least on the keel; pods 10 to 20 mm. long. 



28. A. bisulcatus. 



Flowers whitish; pods less than 10 mm. long 29. A. haydenianus. 



Pods not bisulcate. 



Leaflets spinose-tipped. (Kentrophyta.) 53. A. impensus. 



Leaflets not spinose-tipped. 



Pods membranous or chartaceous, terete or flattened laterally, not 

 inflated. 

 Pods long-stipitate; stipe several times the length of the calyx. 

 Flowers purple; leaflets linear, about 1 cm. long. 



36. A. coltoni. 

 Flowers white; leaflets 2 cm. long or more. 



37. A. lonchocarpus. 

 Pods sessile or short-stipitate ; stipe seldom exceeding the calyx. 

 Pods more or less flattened laterally. 



Pods sessile (linear-oblong, about 3 mm. long). 



30. A. diversifolius. 

 Pods stipitate.' '' 



Stipe as long as or longer than the calyx; flowers whitish. 



31. A. tenellus. 

 Stipe veiy short, barely 1 mm. long; flowers purple. 



32. A. wingatanixs. 

 Pods subterete. 



Pods sessile 30. A. diversifolius. 



Pods stipitate, the stipe sometimes xery short. 

 Stipe as long as the calyx; plants erect. 33. A. proximus. 

 Stipe very short, almost obsolete; plants erect or decum- 

 bent. 

 Plants erect; pods 5 mm. in diameter at the upper end, 

 tapering to the small stipe, 2 cm. long or more. 

 ^ 34. A.fmdleri. 



