97 
more glabrous and glandular appearance. Possibly the two 
Species may run together, though in the bulk of the material in 
the herbaria examined they can be easily separated. Mr. P. A. 
Rydberg, who has studied the species in the field, considers them 
undoubtedly distinct, and it seems advisable to keep them apart. 
Montana—Fort Custer, Mearns, No. 244 (1889). 
Wyoming—North Fork of the Platte, Fremont (1842); Turkey 
Creek, Frémont (1845). ; 
/linois—Beardstown, Geyer (1842). 
Missouri—Big Bend of the Missouri, Lewis and Clarke (Sept. 21, 
1804, type); Herb. Chapman. 
Arkansas ?_Vernijo, Abert (1840). 
Nebraska—Fort Kearney, Engelmann (1856); Drexel Co., P. A. 
Rydberg (1890); near Sidney, P. A. Rydberg, No. 47 (1891). 
Kansas—Sherman Co., Smyth, No. 345 (1892). 
Colorado—_G. W. Hulse; Golden, Britton (1882); Boulder, E. 
Penard, No. 176 (1891). 
7. PSORALEA OBTUSILOBA Torr. and Gray. 
Psoralea obtusiloba Torr. and Gray, Fl. N. Am. 1: 300 (1838). 
Type in Herb. Columbia College. 
Psoralea tenuifiora var. obtusiloba S. Wats. Bibliogr. Ind. 255 
(1878), 
Erect, 30-60 cm. high, branches spreading, stems more or 
ss canescent with fine, appressed, silky, white hairs; stipules 
very small, setaceous ; petioles much shorter than the leaflets, the _ 
Upper ones often nearly sessile; leaves 3-foliolate, the basal ones 
often 4-5-foliolate ; leaflets 5 mm. to 3 cm. long, 3-12 mm. or more 
Wide, oblong-obovate, retuse or mucronulate, covered on both 
Surfaces with minute black glands, glabrous above, minutely can- 
escent beneath ; racemes 3-9 cm. long; flowers loosely scattered ; 
wits Very small, ovate, cuspidate; calyx canescent with white, 
silky hairs, the lobes glandular, obtuse or acutish ; pod about 8 
mm. long ; beak short, stout, straight; seed compressed, obliquely 
void, brown. 
f Intermediate between P. tenuiflora and P. floribunda. Differing 
rom 
leaflets and somewhat larger flowers and less pubescent or canes: i 
hs ppearance. ee a) ee ee oe 
the latter in its less dense inflorescence and much broader cae 
