298 NORTH AMERICAN FLORA [Volume 24 



long; leaflets 7-17, oval or obovate, rounded at the apex, 5-12 mm. long, 3-8 mm. wide, 

 silky-canescent, strigose on both sides; peduncles 2-5 cm. long, shorter than the leaves; 

 racemes 4— 7-flowered; bracts lanceolate, 3 mm. long; calyx strigose-canescent, the tube about 

 8 mm. long, the teeth subulate, 2 mm. long; corolla purplish, about 15 mm. long; banner 

 narrowly obovate, slightly retuse ; wings slightly shorter, with oblong blades ; keel-petals much 

 shorter, strongly lunate; pod ovoid, comparatively thin-valved, strigose, about 15 mm. long, 

 abruptly acuminate. 



Type locality: William Station. Arizona. 



Distribution: Central Arizona. 



Illustration: M. E. Jones, Rev. Astrag. pi. 47. 



19. Xylophacos tephrodes (A. Gray) Rydb. Bull. Torrey Club 



52: 156. 1925. 



Astragalus tephrodes A. Gray, PI. Wright. 2: 45. 1853. 

 Tragacantha tephrodes Kuntze, Rev. Gen. 948. 1891. 



A perennial, with a woody root and cespitose caudex; stems decumbent or ascending, 

 2-8 cm. long, white-canescent; leaves 4—7 cm. long, the rachis canescent; stipules deltoid, 

 canescent, 2-3 mm. long, the lower connate; leaflets 13-21, obovate to oblong, 5-10 mm. long, 

 white-silky-villous beneath, glabrate above, rounded at the apex; peduncles 5-8 cm. long; 

 racemes dense, 2-4 cm. long; bracts lance-subulate, 4 mm. long; calyx white-silky-villous, the 

 tube 5 mm. long, the teeth subulate, 2 mm. long; corolla purple, 12-14 mm. long; banner 

 obovate, moderately arched; wings about 1 cm. long, the blade oblong, somewhat falcate; 

 keel-petals shorter, the blade broadly lunate, rounded at the dark apex; pod obliquely ovoid, 

 slightly arched upwards, about 15 mm. long, 5 mm. thick, and 6 mm. wide, strigose-canescent. 



Type locality: Organ Mountains, New Mexico. 

 Distribution: Southern New Mexico. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 48. 



20. Xylophacos argophyllus (Nutt.) Rydb. Bull. Torrey Club 



40:49. 1913. 



Astragalus argophyllus Nutt.; T. & G. Fl. N. Am. 1: 331. 1838. 

 Astragalus uintensis M. E. Jones, Proc Calif. Acad. II. 5: 670. 1895. 

 Xylophacos uintensis Rydb. Bull. Torrey Club 32: 662. 1906. 

 Astragalus argophyllus Martini M. E. Jones, Rev. Astrag. 207. 1923. 

 Astragalus argophyllus cnicensis M. E. Jones, Rev. Astrag. 208. 1923. 



A perennial, with a cespitose caudex; stems usually less than 1 dm. high, decumbent at 

 the base, hirsute-strigose; leaves 5-10 cm. long, ascending; lower stipules deltoid and short, 

 the upper narrowly lanceolate, 5-15 mm. long; leaflets 13-21, lanceolate, acute, 8-15 mm. 

 long, 2-4 mm. wide, long-strigose on both sides; peduncles 4—8 cm. long, shorter than the leaves; 

 bracts linear-lanceolate, about 5 mm. long; raceme 3-S-flowered; calyx white-strigose, the 

 tube about 1 cm. long, the teeth subulate, 4-5 mm. long; corolla 2-2.5 mm. long, pink-purple; 

 banner oblong-obovate, deeply notched ; wings shorter, the blade oblong, shorter than the claw, 

 with a broad basal auricle; keel-petals much shorter, the blade broadly lunate, obtuse; pod 

 ovoid, hirsute with ascending hairs, 2-2.5 cm. long, 8 mm. wide and thick, short-acuminate, 

 slightly falcate. 



Type locality: Valleys of the Rocky Mountains, near the sources of the Platte, Wyoming. 



Distribution: Montana and Idaho to Nevada, Utah, and Wyoming. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 46; also var. cnicensis; pi. 47, var. Martini. 



3. Missourienses. Cespitose perennials, with short stems. Leaves densely strigose-ca- 

 nescent on both sides. Pod leathery or woody, oblong, straight, strigose, with both sutures 

 prominent, abruptly acute. 



