Rydberg : Studies ox the Rocky Mountain Flora 36 



8 mm. long : banner slightly hairy on the back, light blue, with 

 a light brownish spot at the center, about 8 mm. long : wings light 

 blue, about i cm. long, equaling the keel, w^iich is whitish with 

 purple tip: pod densely silky-villous, about 25 mm. long and 8 

 mm. wide, 4— 5 -seeded. 



This species has the general habit and the long dense raceme 

 of Z. IcKcopJiyllns, but is much greener and the flowers are much 

 smaller and lighter in color. No. 435, cited below, is referred 

 here doubtfully. It is more silvery and more branched and had 

 apparently almost white flowers. 



Montana: (locality not given), 1900, E. ]\ Wilcox, ^^6 (type 

 in U. S. Nat. Herb.) ; Coal Spur, ^jj (?) and ^yp (the latter in 

 fruit); Gallatin Valley, 1896, /. H. F/odtiiaii, dry. 



Astragalus sulphurescens sp. no v. 



A light green cespitose perennial. Stems ascending, about 4 

 dm. high, angled, glabrous, somewhat branched : stipules ovate to 

 lanceolate, membranaceous, free from the petioles : leaflets 13—19, 

 elliptic, obtuse or acutish, mucronulate, 12—30 mm. long, with a 

 few scattered strigose hairs : spike dense and elongated : flowers 

 ascending : bracts lanceolate-subulate, about 8 mm. long : calyx 

 white-strigose with scattered black hairs : tube about 5 mm. long : 

 lobes almost filiform, fully 5 mm. long : corolla light yellow : 

 banner narrow, 15-18 mm. long, much exceeding the wings and 

 keel : wings very narrow, only about 1.5 mm. wide : pod 2-celled, 

 with dorsal suture deeply inflexed, deeply obcordate in section, 

 about I cm. long, 3—4 mm. wide, strigose, with black hairs. 



This species is closely related to A. adsurgcns, but differs in the 

 yellow, ascending flowers, narrow petals, more scant pubescence, 

 the long slender calyx lobes and the black hairy pod. It grows 

 at an altitude of 1600-3000 m. 



Colorado: Georgetown, 1895, P. A. Rydberg (type) \ along 

 Platte River, Denver, 1878, Af. E. Jones, 8ji. 



Aragallus villosus sp. nov. 



Densely and intricately cespitose perennial. Leaves basal, 

 numerous, 5—10 cm. long : leaflets 25—31, rather crowded but not 

 verticillate, i — 1.5 cm. long, lanceolate, very acute, densely but 

 somewhat loosely silky : scape about 1.5 dm. long, loosely silky, 

 almost hirsute, with spreading hairs : spike dense, 4—5 cm. long : 

 bracts linear or narrowly linear-lanceolate, 8—10 mm. long : calyx- 



