197 
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 sides reflexed 45 de- 
grees at a point a iiitle above the base, and fully 2 mm. wide there, but 
not at all at tip or very base; groove very wide and pear-shaped with 
the wide 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 
wings 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 tip which is a trifle darker but not distinctly purple, about 2 mm. 
shorter than banner. ‘Calyx campanulate, abruptly acute at base but 
appearing trurftate, tube about 2 mm. long, not oblique, inclined to be 
hyaline, with spreading and unequal tips aboutas 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 1dm. long, and 
rather longer than.the leaves. Leaves hard'y 1 dm. long, nearly ses- 
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, adnate, con- 
nate only 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 middie, narrowly elliptical, to oval. Leaflets el- 
liptical-oblong, 1-2 cm. long. Elk head ranch on the upper Virgin 
river Utah. 
