92 Inflati. 
ABC3D. Flowers about 5-9 mm. long, purplish, rarely white, 
Calyx narrowly campanulate. Stipules not connate, rather 
wide, not turnina black. Pods shaggy, with longer and den- 
ser hairs than on the leaves opening along botn sutures at 
tip, obcompressed, narrow, conspicuously arcuate, inclined 
to be sulcate at both sutures, somewhat inflated, the dorsal 
suture double. Leaflets slightly if at all notched not evi- 
dently cuneate, short-petiolulate, about 1 cm. long, rather 
narrow, Plants of the Navajo and Green River Basins, 
growing in poor soil in valleys, Lower Temperate life zone, 
Often blooming as winter annuals. A. desperatus would be 
sought here when the pods are very thin, 
Whole plant softly and densely hairy. 35 pubentissimus. 
AB2C. Low annuals from a slender and erect root, widely spread- 
= ing and much branched stems not elongated, with short in- 
ternodes and numerous leaevs. Fiowers rather few and race- 
mose on axillary peduncles shorter than the leaves. 5-8 mm. 
long, mostly white, much arched. Stipules not connate, small 
Leaflets not over 7 pairs, narrow, thickish, obtuse. Pods very 
oblique, opening first at tip, mostly somewhat arcuate, papery, 
wrinkled, reflexed except in A. aridus. Pedicels very short 
and about as long as the minute bracts. Calyx campanulate 
to hemispherical, about 2 mm, long. Aridi. 
AB2CD. Pods strongly pubescent, but less so than the leaves 
with flat beak very short and mostly scarcely evident, ob- 
liquely oblong-ovate or half-oval-ovate, slightly inflated al- 
most filled by the large seeds, hardly 1.5 cm. long, jointed to a 
minute stipe. Leaflets elliptical. 
Plants appearing green but with short hairs. Pods rounded 
below, barely flattened. Flowers about 7 mm. long. 36 sabulonum. 
Plants hoary. Pods narrowed below and much flattened at both 
ends. Flowers about 5 mm. long. 37 aridus. 
AB2C2D. Pods only minutely pubescent when mature, hoary 
with very short hairs when young, very cblique, translucent 
and very thin and much inflated, conspicuously.and very 
obliquely flat-beaked, about 2 cm. long and 1 cm. high or 
wide, reflexed. Leaflets linear or seemingly so by being 
folded. 
Pods very oblique, half-ovate to lunate. 38 Geyeri. 
AB3C. Slender, elongated plants, weak, mostly annual, inter- 
nodes slender and leaves rather sparse, at le^s* not very many 
Flowers rather many in conspicuous racemes and about 1 cm. 
long, mostly nurnle, not conspicuously arche.  Pedunc!es 
elongated and mostly as long as or longer than the leaves Sti- 
pules not connate, small. Upper leaves short-petíoled. Leaf- 
lets narrow. over 7 pairs Pots with thin flat beaks, 1-2 
cm. long, fully half as wide, inclined to be bellied in the 
middie. rarely at all obcomoressed. manery, rarely wrinkled. 
Pedicels almost none or short and bracts very small. Calyx 
campanulate, small, rarely 3 mm. long. Stems prostrate or 
decumbent. Proriferi. t 
AB3CD. Pods reflexed, chartaceous to membranaceous, not 
over 1 cm, long (2 cm. in one form of A. Vaseyi), somewhat 
oblique but with ventral suture always convex in the middle, 
triangular-narrowed at base (abrutply so at base) and apex. 
i inflated in the middle till the cross section is round, not 
sulcate, with sharp beak, somewha. .riquetrous below the 
j flat tip, obliquely elliptical to oval, with both sutures evi- 
E dent and the ventral raised. Flowers many, spicate to 
