RypBerG: Rocky MouNTAIN FLORA 419 
Legume glabrous. 
Stipe rarely exceeding the tube of the calyx; leaves usually spreading in age; 
leaflets oblong to oval, obtuse and mucronate. H, dispar. 
Stipe of the mature legume usually exceeding the calyx-teeth ; leaves strongly as- 
cending ; leaflets narrowly linear to linear-oblong, mostly acute. 
Stipe 3-4 mm. long ; leaflets linear or linear-oblong ; stem usually conspicu- 
ously strigose; calyx-teeth half as long as the tube. ff, tenellus. 
Stipe 5-7 mm. long; leaflets narrowly linear; stem glabrous or nearly so ; 
calyx-teeth usually nearly equaling the tube. 7. stipitatus. 
Legume strigose. fT, strigulosus. 
Homatosus pispar Nutt.; T. & G. Fl. N. Am. 1: 350. 1838. 
Orobus dispar Nutt. Gen. 2: 95. 1818. 
This is much less common and has a more restricted range 
than H. tenellus. The range of H. dispar includes the extreme 
western portion of Nebraska, Wyoming, northern Colorado and 
Northeastern Utah, while that of 4. sene//us extends from Sas- 
katchewan to Nebraska, Colorado, Utah, and the Yukon Territory. 
Homalobus stipitatus sp. nov. 
Somewhat cespitose perennial ; stems slender, 3-4 dm. high, 
erect, branched, sparingly strigose or glabrate, leafy ; leaves 
strongly ascending, 4-6 cm. long ; stipules lance-subulate ; leaflets 
9-15, narrowly linear, 1-2 cm. long, I-2.5 mm. wide, glabrous or 
Sparingly strigose beneath ; peduncles about 1 cm. long ; racemes 
lax, 2-10 cm. long, 5—20-flowered ; calyx strigose; tube cam- 
panulate, about 1.5 mm. long ; teeth subulate, about as long ; corolla 
ochroleucous, 8~1o mm. long; legume glabrous, stipitate, flat ; 
body oblong, about 1 cm. long, 3 mm. wide, acute, gradually 
tapering into the stipe, which is 5—7 mm. long. 
_ This species is related to H. tenellus (Pursh) Britton [As¢ra- 
galus multiforus (Pursh) A. Gray], but is a more slender and more 
glabrate plant, with narrower leaflets and longer stipe. It 
belongs to the prairie region east of the range occupied by #7. 
lenellus. 
Norra Daxora: “Upper Missouri” [from the data given in 
Nicollet’s report, on the hills somewhere between Fort Pierre and 
Devil's Lake], 1839, Geyer (type in herb. Columbia University) ; 
Valley City, 1897, Z. L. Perrine. 
Minnesota: Lake Belmont, Otter Tail Co., 1892, Z P. 
ddon. 
SASKATCHEWAN : 1858, &. Bourgeau 4. 
