T9 



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 archqd 30 de- 

 grees, concealing keel, narrowly oblong, rounded, 2 mm. wide, as wide. 

 Es and 2 mm. longer than keel, concave to It, one bent over keel and 

 the other b'^nt out, inclined to be white-tipped. Keel rounded till 

 the tip is erect or more incurved, obtuse to acute, dnrk-purple. Calyx 

 narrowed but not gibbous below, not flattened, cleft deeper, above, 

 apjuessed hairy, lower side straight and upper arched, tube 2-3 mm. 

 long, teeth subulate and arched, about as Ions 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. Lraf rachis rather rigid, enlarged above to a sin.gle 

 uniointed leaflet which is in the type oblancenlate to spatulate or' lin- 

 e'^r. 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 'linmeter. The type grows on the arH clay plains 

 of the Green River Rasin Wyo. and adjacent Utah to Cave Hills S. 

 Dakotah. Blooms May to July. It passes by imperce\)tible grada- 

 tion into 



Astragalus simplicifolius var. oaespitosus (Nutt.) Jones Cont. 7 

 6-17 (1895) A. simplicifolius var. spatulatus (Sheldon) Jones Cont.. 

 10 65 (1902) A. spatulatus Sheldon Minn. Bbt. Stud. 9 22 (1894) 

 Homalcbus caespitosus Nutt. in T. & G. Fl. 1 352 (1838) Tragacantha 

 caespitosa (Nutt.) Kuntze, Homalobus canescens Nutt, and brachy- 

 carpus Nutt. A. lingulatns 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 

 as the bracts, Peduncles conspicuous, longer than the leaves. Leaves 

 either a long ligulate or filiform petiole without leaflets (3-5 f^m. Ion?) 

 rr with 1-2 pairs of filiform to oblanceolate leaflets mostlv jointed to 

 the rachis. From the Plains of central Colorado through \Vyoming to 

 the Wasatch, and from the Cedar Mt. near Green River Utah and 

 Duchesne Valley Utah northward to Assiniboia and the Yellowstone 

 Park. A. lingulatns 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, falcate, about 2-3 cm. 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 

 f'pntle 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 blad'^ 

 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-shapef^ krel which has a rounded and erect tin. Bracts 

 about 8 mm. long with green tins. Leaves 5-8 cm. long, with slender 

 petioles and about 2 nairs of oblanceolate leaflets all jointed to rachis 

 as well as the terminal one wh'ch is not conspicuously larger than 

 the rest, sorre of the less developed leaves are much shorter and some- 

 Mmes with obovate leaflets. Stipule« lanceolate. Stems very short but 

 '^'^t reduced to crowi<^, the internodes nearly as long as the stipules, 

 ('"owing in small mats rarely a foot in diameter on clay knolls in the 

 cq.non south of Theodore TTtah on the upper edge of the Juniper belt. 

 This may be an pxtreme form of A. simplicifolius but though the ma- 

 terial is ample there are no intergrades known. 



