Part 5, 1929] FABACEAR: GALEGEAE 261 



long, pubescent; blade linear or narrowly linear-oblanceolate, pungently acute, involute, 2-4 

 cm. long, less than 2 mm. wide, silvery-canescent, tapering below into the filiform petiole; 

 peduncles 1- or 2-flowered, 2-3 cm. long; bracts small, scarious; calyx-tube campanulate, more 

 or less strigose, 3-4 mm. long; lobes subulate, 1.5-2 mm. long; corolla 10-15 mm. (in the original 

 description up to 20) long, ochroleucous or nearly white, the keel tipped with purple; 

 petals similar to those of H. simplicif otitis; pod sessile, oblong, slightly curved, acuminate, 

 purple-mottled, 12-15 mm. long, 4 mm. wide, somewhat turgid, few-seeded; seeds 2-5 mm. 

 long, broadly obliquely oblong, with the funicle near one end. 



Typr Locality: Foot of Big Horn Mountains, Wyoming. 

 Distribution: Wyoming. 



2. Tenelli. Cespitose caulescent perennials, with a branched caudex or rootstock. 

 Stems mostly erect, except in the last three species. Racemes several-flowered. Calyx cam- 

 panulate, mostly strigose, the teeth mostly subulate. Corolla purple, white, or ochroleucous, 

 the banner varying from slightly to strongly arched, usually a little longer than the wings. 

 Keel-petals with a lunate blade about equaling the claw and rounded at the apex. Pod mem- 

 branous, sessile or short-stipitate, oblong to oval, usually abruptly acute at each end, glabrous 

 or short-hairy, mostly strigose, if black-hairy merely strigulose. 



7. Homalobus dispar Nutt.; T. & G. Fl. N. Am. 1: 350. 1838. 



. Orobus dispar Nutt. Gen. 2: 95. 1818. 



Phaca nigrescens Hook. Fl. Bor. Am. 1: 143. 1831. 

 • Physondra dispar Raf. Atl. Jour. 145. 1832. 



Homalobus nigrescens Nutt.; T. & G. Fl. N. Am. 1: 351, in part, as synonym. 1838. 



A perennial, with a cespitose rootstock or caudex; stems 2-5 dm. high, sparingly strigose 

 or glabrate, striate; stipules ovate or deltoid, connate, the upper green, the lower scarious, 

 soon blackening; leaves 4—6 cm. long, blackening in drying; leaflets 11—21, linear-oblong to oval, 

 8-15 mm. long, 2-6 mm. wide, obtuse or acute, glabrous above, with scattered hairs beneath; 

 racemes many-flowered, lax, 4-8 cm. long, very short-peduncled; bracts subulate, 2 mm. long; 

 calyx sparingly strigose, the tube 2 mm. long, the teeth lanceolate, 1 mm. long; corolla ochro- 

 leucous, the keel purple-tipped; banner 6-7 mm. long, obovate, retuse; wings 5-6 mm. long, 

 the blade broadly obliquely oblanceolate, with a rounded basal auricle; keel-petals slightly 

 shorter, with a rounded inflexed tip and a rounded basal auricle, the blade somewhat longer 

 than the claw; pod short-stipitate, ellipsoid, acute at each end, about 1 cm. long and 4 mm. 

 wide, glabrous, reticulate, the stipe shorter than the calyx; seeds black, oblong-reniform, 3 mm. 

 long, 1.5 mm. broad. 



Type locality: Hills near Fort Mandan. North Dakota. 



Distribution: Saskatchewan and Alberta to Wyoming, Colorado, and western Nebraska. 



Illustrations: M. E. Jones, Rev. Astrag. pi. l,f. 2d; Am. Jour. Bot. 15: pi. 44 B. 



8. Homalobus tenellus (Pursh) Britton; Britt. & Brown, 

 111. Fl. 2: 305. 1897. 



Astragalus tenellus Pursh, Fl. Am. Sept. 2: 473. 1814. 

 ■Ervum mullijlorum Pursh, Fl. Am. Sept. 2: 739. 1814. 

 Homalobus multifiorus T. & G. Fl. N. Am. 1: 351. 1838. 



Homalobus nigrescens Nutt.; T. & G. Fl. N. Am. 1: 351, in part, as rynonym. 1838. 

 Astragalus nigrescens A. Gray, Am Jour. Sci. II. 33: 410. 1862. 

 Astragalus multifiorus A. Gray, Proc. Am. Acad. 6: 226. 1864. 

 Tragacantha tenella Kuntze, Rev. Gen. 942. 1891. 



A perennial, with a cespitose caudex, closely resembling the preceding; stems 3-5 dm. 

 high, sparingly strigose; stipules ovate to lanceolate, connate; leaves 5-10 cm. long; leaflets 

 13-21, linear or oblong, obtuse, 1-2 cm. long, 1-3 mm. wide, glabrous on both sides, or with 

 scattered hairs beneath; racemes 4-8 cm. long, short-peduncled, many-flowered; flowers as in 

 the preceding, but the corolla usually smaller, rarely more than 6 mm. long; pod glabrous, 

 stipitate, the stipe 3-4 mm. long, the body 8-10 mm. long, 3 mm. wide, reticulate; seeds 3 mm. 

 long, 1.5 mm. wide. 



Tyte locality: Banks of the Missouri. Montana. 

 Distribution: Manitoba to Yukon, Nevada, and Colorado. 



Illustrations: Fl. Neb. 21: pi. 9,f. 33-36; M. E. Jones, Rev. Astrag. pi. 1, f. 2; Britt. & 

 Brown. 111. Fl. /. 2151; ed. 2./. 2556. 



