F6 

 TRIPHYLLI 2. 



Densely cfespitose and aeaulescent plants with largo crowns 

 and digitate silvery leaves. Flowers elongated and narrow 

 2-3 cm. long, white. Peduncles none, with flowers sessile 

 among the stipules Avhich are large, hyaline and smooth above 

 and long-hairy below. Pods about ovate, hoary, very small 

 and inclosed in calyx. Much nearer related to the Ocreati than 

 the Sericoleuci. 



Flowers smooth. 24 tripbyllus 



Flowers hairy. 25 hyalinus 



24. Astragalus triphyilus Pursh Fl. 740 (1814). Phaca caespitosa 

 and argophylla Nutt. A. gilviflorus Sheldon. Orophaca caespitosa 

 (Nutt) Britton. Leaflets 3-5, oblanceolate, 1-2 cm. long, acutish, often 

 folded, jointed to the variable petiole, densely pnbescent with warty 

 straight, slender hairs fixed near the base. Flowers with banner 

 oblanceolate to obovate and with a long and narrow claw, a little 

 arched at tip ina gentle arc, sides much reflexed. about 9 mm. longer 



than keel. Wings linear to narrowly oblanceolaterounded and obtuse, 

 straight, about 3 mm. wide, as wide as keel and 2-7 mm. longer. 

 Keel blade broadly linear, straight, about 7 mm. long, purple-tipped, 

 but little wider at tip where the lower side is arched in semicircle and 

 with the upper corner very obtuse and not produced, general oitline 

 nearly linear-cuneate. Calyx tube cylindric, often a little inflated, 

 1-1.5 cm. long, straight, laterally flattened, with acute and obliq'ie 

 base, not 5 mm. wide, appressed-shaggy with white hairs, the teeth 

 triangular and about 3 mm. long. Pods 5-7 mm. long, acute, cro^s 

 section nearly round, the ventral suture a trifle arched, little if at p11 

 sulcate. Ventral suture raised and decidedly thickened. On the 

 Plains frnm Nebraska and northern Colorado to the base of the P.cr-lc'es 

 and northward to the Sn«katchewan, apparently not on the Pacific 

 slope. Blooms early in May. 



25. Astragalus hy?linus Jones Cont. 7 648 (1895). Stems loo^e'v 

 matted, us-iplly erect 2.5-6 cm. high at the ends of the much branched 

 tap root. Stipules very conspicuous, large and much imbricated, at 

 least 2 c'Ti. long, smooth except at base. Leaflets narrowly elliptical 

 to oblanceolate. rbnit 1 cm. long and 4 mm. wide, 3, densely silvery- 

 silky with h-^irs attach'^d rear the middle Petiole variable. Flowers 

 and pods similar to fi^e above but flowers hairy all over. On the 

 Plains with A. triphyllis and may be an abnormal form. 



