I'.iT 



sometimes the bases of wings and keel are purple, about 8 mm. long, 

 10-15 in number, sessile, stubby. Banner about 2 mm. long, abruptly 

 arched at calyx tips to nearly erect, oval, the s.des reflexed 45 de- 

 grees at a point a little above the base, and fully 2 mm. wide there, but 

 not at all at tip Oi \ ery base; groove very wide and pear-shaped with 

 the vv'ide end up, 2 mm. wide and 1 mm. deep and with an additional 

 groove in the middle; blade rather hooded, waterlined from the back 

 much as in A. Beckwithii the groove filling the whole of the banner 

 tip and narrowing below, U-shaped above and V-shaped below. The 

 v.'ings are oblanceolate, obtuse, arched so that the base follows the 

 curve of the keel, fully 1 mm. wide, close-pressed to keel, but toward 

 the tip the upper edges spread a little, about 1 mm. longer than keel. 

 Keel about 4 mm. long, the base bent in a rather long arc and then ab- 

 ruptly rounded to a little more than erect, and with a deltoid and ob- 

 tuse ti;) whicli is a trifle darker but not distinctly purple, about 2 mm. 

 ■-.iiorter than banner. Caly.K campanulate, abruptly acute at base but. 

 appearing truncate, tube about 2 mm. long, not oblique, inclined to be 

 hyaline, with spreading and unequal tips about as long as tube. Ped- 

 icels very stout, about 1 mm. long. Bracts firm, ovate, in flower 2-3 

 times as long as pedicels. Peduncles slend er, about 1 dm. long, and 

 rather longer than the leaves. Leaves hardV 1 dm. long, nearly se-'- 

 sile, wide. Leaflets 7-9 pairs, 1-2 cm. long, oval to oblong, obtuse to 

 notched, shortly truncate at the long-petiolulate base, thickish, contig- 

 uous. Stipules rigid, green, large, triangular, reflexed, adiiate, con- 

 nate onlj' at base of stems, about 5 mm. long. .Stems flexuous, with ' 

 internodes 5-7 cm. long, several from a stout and woody root, strag- 

 gling over bushes or lying flat on the ground. Whole plant softly pu- 

 bescent with spreading hairs, growing on gravelly mesas among bush- 

 es or under pines. Middle Temperate life zone, from the head of the 

 Sevier and the Colob to Springdale and the Kaibab on the Colorado, 

 Utah and Arizona, blooming in summer. This was named for that in- 

 defatigable collector A. L. Siler who worked in this region. 



Astragalus Sileranus var. cariacus Jones Cont. 7 642 (1895). Pods 

 2-4 cm. long, variously acuminate-tipped and often tapering at base, 

 the tip being upturned and the base down, and so the pods are oblique,, 

 much inflated in the middle, narrowly elliptical, to oval. Leaflets el- 

 liptical-oblong, 1-2 cm. long. Elk head ranch on the upper Virgin 

 river Utah. 



