19 
degrees, hooded and emarginate, as long as, to 1 mm, longer than 
wings, groove deeper below, sides reflexed most in middle to 1 mm. 
wide, white spot very small and purple-veined. Wings arched 30 de- 
grees, concealing keel, narrowly oblong, rounded, 2 mm. wide, as wide 
as and 2 mm..longer than keel, concave to it, one bent over keel and 
the other bent out, inclined to be white-tipped. Keel rounded till 
the tip is erect or more incurved, obtuse to acute, dark-purple. Calyx 
narrowed but not gibbous below, not flattened, cleft deeper, above, 
appressed hairy, lower side straight and upper arched, tube 2-3 mm. 
long, teeth subulate and arched, about as long as tube. Pedicels 
about 1 mm. long in flower and 2 mm. long in fruit, much shorter than 
the bracts which are lanceolate, acuminate and nearly as long as calyx 
tube, pubescent. Leaf rachis rather rigid, enlarged above to a single 
unjointed leaflet which is in the type oblanceolate to spatulate or lin- 
ear, flat or involute and barely 2 cm. long. Stems in dense cushions 
each crown about as broad as long. Branches of root 2-3 mm. thick, 
cushions 1-2 feet in diameter. The type grows on the arid clay plains 
of the Green River Basin Wyo. and adjacent Utah to Cave Hills S. 
Takotah. Blooms May to July. „It passes by imperceptible grada- 
tion into 
Astragalus simplicifolius var. caesritosus (Nutt.) Jones Cont. 7 
647 (1895) A. simplicifolius var. spatulatus (Sheldon) Jones Cont. 
10 65 (1902) A. spatulatus Sheldon Minn. Bot. Stud. 9 22 (1894) 
Homalobus cespitosus Nutt, in T. € G. Fl. 1 352 (1838) Tragacantha 
cespitosa (Nutt. Kuntze, Homalobus- canescens Nutt, and brachy- 
carpus Nutt. A. lingulatus Sheldon. A. exilifolius Nelson. Pods linear, 
nearly 1 cm. long, straight or arched, erect or ascending, short-race- 
mose, Flowers several, capitate. Pedicels in fruit at least as long 
88 the bracts, Peduncles conspicuous, longer than the leaves. Leaves 
either a long ligulate or filiform petiole without leaflets (3-5 cm. long) 
cr with 1-2 pairs of filiform to oblanceolate leaflets mostly jointed to 
the rachis. From the Plains of central Colorado through Wyoming to 
the Wasatch, and from the Cedar Mt. near Green River Utah and 
Duchesne Valley Utah northward to Assiniboia and the Yellowstone 
Park. A. lingulatus is the form with phyllodia-like petiole, A. exili- 
folius is a form with pods of simplicifolius and leaves nearly of lingu- 
latus. 
15. Astragalus detritalis Jones Cont. 13 9 (1910). Pods narrowly- 
linear, faleate, about 2-3 em. long, and 2 mm. high, minutely pubescent 
and mottled, flat when young at least, ascending, capitate, nearly 
sessile, with short-triangular and declined tip. Flowers about 1.5 cm. 
long, several, capitate. Calyx short-cylindric, about 5 mm. long and 3 
mm. wide, with conical base, equally inserted, oblique at tip and much 
deeper cleft above, the arcuate and subulate teeth unequal and as long 
as tube. Banner oblong-oval, notched, 8 mm. long, erect, arched in 
gentle arc from base to tip, with sides reflexed 1 mm. wide in mid- 
dle, white spot of several bands 2 mm. below tip. Wings with blade 
narrowly oblong, about 3 mm, wide, rounded and obtuse, flat to keel 
about 2 mm. shorter than banner and 3 mm. longer than the straight, 
Innate or boat-shaped keel which has a rounded and erect tip. Bracts 
about 8 mm. long with green tips. Leaves 5-8 cm. long, with slender 
petioles and about 2 pairs of oblanceolate leaflets all jointed to rachis 
2s well as the terminal one which is not conspicuously larger than 
the rest, some of the less developed leaves are much shorter and some- 
times with obovate leaflets. Stipules lanceolate, Stems very short but 
not reduced to crowns, the internodes nearly as long as the — 
Growing in small mats rarely a foot in diameter on clay knolls M 
canon south of Theodore Utah on the upper edge of the er elt, — 
This may be an extreme form of A. simplicifolius but though the ma — — 
terial is ample there are no intergrades known. 
