92 Inflati. 



ABC3D. Flowers about 5-9 mm. long, purplish, rarely white. 

 Calyx narrowly campanulate. Stipules not connate, rather 

 wide, not turning 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. 

 \Vhole 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. Flowers 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 arcuat?, 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 l^ss so than f-e 'e^f-s 

 with flat beak very short and mostly scarcely eviHent, ob- 

 liquely oblong-ovate or half-oval-ovate, slightly inflated al- 

 most filled by the large seeds, hardly 1.5 cm. long, jcinted 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 wh-n r'ature, hoary 

 with very short hairs when young, very cb;i':ue. translucent 

 and very thin and much inflated, conspicuously and very 

 obliquely flat-beaked, about 2 cm. long and 1 cm. hinh or 

 wide, reflexed. Leaflets linear or seemingly so by being 

 folded. 

 Pods very oblique, half-ovate to lunate. 38 Geyeii. 



AB3C. Slender, elongated plants, weak, mostly annual, inter- 

 nodes slender and leaves rather sparse, ?t le^S'': rot very.^vianv 

 Flowers rnther many in conspicjci's r3ce:nes ard about 1 cm. 

 long, mosti / nur'-'le, not conspicro-jsly archp-' Peduncles 

 elongated and mostly as long as or longer than the leaves Sti- 

 pules not connate, small. Upper leaves short-petioled. Leaf- 

 lets narrow, over 7 mirs Po's v«'it'-. thin fat beals, 1-2 

 cm. long, fully half as wide, inclined to be bellied in th^ 

 ' iHrtle rarely at all obconcressed. pTrerv, r-re'v wr'-kl^d. 

 Pedicels almost none or short and bracts very small. Calvx 

 campanulate, small, rarely 3 mm. long. Stems prostrate or 

 decumbent. Proriferi. 

 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, 

 inflated in the middle till the cross section is round, not 

 sulcate, with sharp beak, somewhat triquetrous below the 

 flat tip, obliquely elliptical to oval, with both sutures evi- 

 dent and the ventral raised. Flowers many, spicate to 



