253 
HAMOSI. 27. X 
Pods linear or narrow, 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 sharp-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 Mulfordz), rigid, coriaceous only in glaber 
and A. distortus and then somewhat fleshy, chartaceous 
(papery in Mulforde 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, 
KEY. 
» 
À. Pods not reflexed, sessile. 
AB. Pods nearly round to reniform 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, not hoary except 
in A. Coahuilæ when young. Plants of New Mexico and 
eastward. 
ABC. Pods cartilaginous, inclined to be fleshy.when green, 
lunate to linear-oblanceolate, acuminate at both ends, cross- 
section about reniform, rarely triquetrous-cordate. Calyx 
teeth shorter than the tube. Flowers rather many and 
nearly capitate. Leaflets elliptical. Stems diffuse and 
spreading. 
Pods 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 ı cm. long, white. 216 glaber. 
Flowers 8 mm. long, purple. 217 Coahuilae, 
A2B. Pods spreading, inclined to be jointed to the calyx, 2- 
celled, nearly linear (sometimes oblong in A. calycosus and 
then small), somewhat laterally flattened to nearly round 
in cross-section and about triangular-cordate, chartaceous, pu- 
bescent, not less than 7 mm. long, 2-4 mm. high, a little 
arcuate, not reflexed, pungently beaked, narrowed at base but. 
net stipitate. Flowers 7-10 mm. long, light-colored, short 
and stubby much as in A. junceus, in heads or short racemes ` 
which are long-peduncled, broad, ascending, with broad petals 
and enlarged or lobed wings. Calyx campanulate, about 4 
mm. long and 2 mm. high, with short teeth. Pedicels about 2 
mm. long and longer than the small bracts. Peduncles 1-1.5 
