253 



HAMOSI. 27. 



Pods linear or naiTow, 1-4 cm. long (rarely 2 cm. 

 long), rarely 5 mm. high, nearly always laterally flat- 

 tened and inclined to be triquetrous in cross section and 

 to have concave sides, mostly acuminate or shai p-pointed, 

 2-celled or with dorsal suture very much intruded, nearly 

 always sulcate dorsally, rarely so ventrally and with 

 ventral suture mostly sharp and raised, not inflated (a 

 little so in Mulfordse), rigid, coriaceous only in glaber 

 and A. distortus and then somewhat fleshy, chartaceous 

 (papery in Mulfordae and Inyoensis), variably arcuate. 

 Flowers small, rarely 1.2 cm. long, in racemes (in short 

 spikes in sylvaticus-Nevinii groups, and in heads in A. 

 calycosus). Slender perennials (A. Inyoensis and albens 

 probably are winter annuals) spreading over the ground 

 in small tufts. Stipules connate only in A. Andersoni, 

 Plants of the Lower Temperate life zone but extending a 

 little into the adjoining zones. 



i 

 KEY. 



A. Pods not refJexed, sessile. 



AB. Pods nearly round to renlform in cross-section, not jointed 

 to calyx, inclined to be narrower below. Flowers with cam- 

 panulate calyx. Leaves nearly sessile, with many pairs of 

 leaflets. Pubescence attached by the base, nol hoary except 

 in A. Coahuilae when young. Plants of New Mexico and 

 eastward. 

 ABC. Pods cartilaginous, inclined to be fleshy v/hen green, 

 lunate to linear-oblanceolate, acuminate at boCh ends, cross- 

 section about renitorm, rarely triquetrous-cordate. Calyx 

 teeth shorter than the tube. Flowers rather mnny and 

 nearly capitate. Leaflets elliptical. Stems diffuse and 

 spreading. 



Pod;- lunate and tapering at both ends. 215 distortus. 



AB2C. Stems erect, a foot or so high. Flowers few in loose 

 racemes. Pods coriaceous only in the first species. 



Flowers I cm. long, white. 216 glaber. 



Flowers 8 mm. long, jiurple. 217 Coahuilae. 



A2B. Pods spreading, inclined to be jointed to (he calyx, 2- 

 celled, nearly linear (sometimes cblcng in A. calycosus and 

 then small), somewhat laterally CatLened to nearly round 

 in cross-section and about triangular-ccrdatr, chartaceous, pu- 

 bescent, not less than 7 mm. long, 2-4 mm. high, a little 

 arcuate, not reflexed, pungently beaked, ncrr wed at base but 

 not stipitate. Flowers 7-10 mm. long, light-colored, short 

 and stubby much as in A. junceus, in heads cr short racemes 

 which are long-peduncled, broad, ascending^, w ih broad petals 

 and enlarged or lobed wings. Calyx ca ::ipanulatc, about 4 

 mm. long and 2 mm. high, with short teeih. Pedicels about 2 

 mm. long and longer than the small brccts. Peduncles 1-1.5 



