272 NORTH AMERICAN FLORA [Volume 24 



purple-tipped; banner obovate, 8 mm. long; blades of the wings obliquely lunate-oblanceolate, 

 6 mm. long, those of the keel-petals lunate, with a lanceolate obtuse tip and a rounded basal 

 auricle; pod sessile or slightly stipitate, 15-20 mm. long, 2-2.5 mm. wide, glabrous; seeds olive- 

 brown, oblong, 2 mm. long, 1.5 mm. wide. 



Type locality: Rocky Mountains on the British Boundary. 

 Distribution: Montana, Alberta, British Columbia, and Washington. 



41. Homalobus hylophilus Rydb. Mem. N. Y. Bot. 

 Gard. 1: 247. 1900. 



Astragalus hylophilus A. Nelson; Coult. & Nels. Man. Rocky Mt. 291. 1909. 

 Astragalus campeslris hylophilus M. E. Jones, Rev. Astrag. 75. 1923. 



A cespitose perennial, with a rootstock, branched near the surface; stems many, 1-3 dm. 

 high, slender, slightly strigose or glabrate; stipules scarious, the upper lanceolate, 5 mm. long, 

 the lower triangular, connate around the stem and somewhat adnate to the petioles; leaves 

 0.8-1.5 dm. long, pinnate; leaflets 13-25, usually about 17, oblong or oval, or in open places 

 linear, glabrous above, sparingly strigose beneath, 8-30 mm. long, 2-10 mm. wide, rounded to 

 acute at each end; peduncles 5-12 cm. long; racemes short, 6-12-flowered, in fruit more lax; 

 bracts lanceolate to linear, subulate, 1-2 mm. long; calyx strigose with dark hairs, the tube 

 2.5-3 mm. long; corolla almost white, tinged with purple, and the keel purple-tipped; banner 

 broadly obovate, retuse, refiexed at the middle; blades of the wings 8 mm. long, obliquely lunate- 

 obovate, rounded at the apex, with an acute basal auricle, the claws less than half as long as the 

 blade; keel-petals 8 mm. long, the blade lunate, with a lanceolate obtuse tip and a rounded 

 basal auricle; pod linear, sessile, glabrous, 2.5-3 cm. long, 3 mm. wide; seeds broadly oblong, 

 fully 2.5 mm. long, barely 2 mm. wide, brown. 



Type locality: Bridger Mountain, Montana. 



Distribution: Montana to South Dakota, Utah, and Idaho. 



Illustrations: M. E. Jones, Contr. W. Bot. 10: pi. 2 (as A. decumbens); Rev. Astrag. pi. 3. 



5. Stenophylli. Caulescent perennials, with a branched caudex. Stems comparatively 

 tall, erect. Racemes elongate, many-flowered. Calyx campanulate, mostly strigose, the 

 teeth subulate or deltoid. Corolla middlcsized, white or purplish. Banner narrowly obovate, 

 much exceeding the wings, moderately arched. Wings with an oblong-falcate or obliquely 

 oblanceolate blade about equaling the claw, the keel-petals with a lunate blade, rounded at 

 the apex. Pod membranous, flat, stipitate, the stipe longer than the calyx, the body linear 

 or lance-linear, long-tapering at the base. 



42. Homalobus Coltoni (M. E. Jones) Rydb. Bull. Torrey Club 

 50:269. 1923. 



Astragalus Episcopus S. Wats. Proc. Am. Acad. 10: 346, in part. 1875. 

 Astragalus Coltoni M. E. Jones, Zoe 2: 237. 1891. 



Homalobus Episcopus Rydb. Bull. Torrey Club 40: 53, in part. 1913. 

 Astragalus Coltoni aphyllus M. E. Jones, Rev. Astrag. 71. 1923. 



A perennial, with a cespitose woody caudex; stems 3-6 dm. high, erect or ascending, 

 glabrous, striate and angled; leaves 5-10 cm. long; lower stipules scarious and connate, the 

 upper ones deltoid, green, mostly free; leaflets 5-7, linear or those of the lower leaves oblong, 

 obtuse, 5-10 mm. long, 1-2 mm. wide, strigose, the terminal one often wanting and represented 

 by the prolonged rachis; peduncles 1-2 dm. long; racemes lax, rather few-flowered; bracts 

 subulate, about 2 mm. long; calyx strigose, often with some black hairs, especially at the 

 margin, the tube 4 mm. long, the teeth subulate, 1.5 mm. long; corolla red-purple; banner 12-13 

 mm. long, obovate; wings 11-12 mm. long; keel-petals 9-10 mm. long, rounded at the apex; 

 pod glabrous, stipitate, the stipe about 8 mm. long, the body oblanceolate, acute at each 

 end, about 2.5 cm. long, 3-4 mm. wide; seeds obliquely reniform, 3 mm. long, 2 mm. broad. 



Type locality: Castle Gate, Utah. 



Distribution: Utah and northwestern New Mexico. 



Illustration: M. E. Jones, Rev. Astrag. pi. l,f. 3. 



