420 NORTH AMERICAN FLORA [Volume 24 



partly adnate to the petiole; leaflets 15-21, elliptic to obovate, 1-2 cm. long, 5-10 mm. wide, 

 hirsute on both sides, rounded at the apex; peduncles stout, 5-10 cm. long; racemes many- 

 flowered, 5"-7 cm. long; bracts subulate, 5-8 mm. long; pedicels short; calyx hirsute-pilose, 

 purple-tinged, the tube 7 mm. long, 2.5 mm. broad, the teeth subulate, 2-4 mm. long; corolla 

 rose-purple, sometimes darkly so, about 2 cm. long; banner narrowly obovate, abruptly arched; 

 wings shorter, the blade obliquely oblong, with a large basal auricle; keel-petals still shorter, 

 the blade broadly lunate; pod 2.5-3.5 cm. long, 5-7 mm. wide and 3 mm. thick, sulcate on the 

 ventral suture, densely long-pilose, narrowly cordate in cross-section. 



Type locality: Near Carson City. Nevada. 



Distribution: Oregon, western Idaho. Nevada, and California. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 57, f. 185 and var. obfalcalus. 



3. Hamosa Layneae (Greene) Rydb. Bull. Torrey Club 

 54: 15. 1927. 



Astragalus Fremontii var. Torr. Pac.R.R. Rep. 4: 80. 1857. 

 Astragalus Layneae Greene, Bull. Calif. Acad. 1: 156. 1885. 

 Astragalus malacus Layneae M. E. Jones, Zoe 4: 29. 1893. 



A perennial, with a deep root and short cespitose caudex; stems 0.5-3 dm. long, with 

 short internodes, strigose-canescent ; leaves spreading, 7-12 cm. long; stipules deltoid, 7-10 

 mm. long, membranous, ciliate; leaflets 13-17, oval or broadly obovate, rounded or retuse at 

 the apex, 1-1.5 cm. (rarely 2 cm.) long, 6-12 mm. wide, long-strigose on both sides, sometimes 

 strongly canescent; peduncles 5-10 cm. long; racemes 5-15 cm. long, rather lax; bracts linear, 

 6-9 mm. long, scarious on the margins; calyx strigose, more or less black-hairy, the tube 6-7 

 mm. long, 3—4 mm. broad, the teeth subulate-lanceolate, about 2 mm. long; corolla white or 

 pinkish, the tip deep-purple; banner 15-17 mm. (rarely 2 cm.) long, narrowly obovate, 

 abruptly arcuate, retuse at the apex; wings shorter, the blade obliquely oblong, slightly falcate, 

 with a large basal auricle; keel-petals nearly as long, the blade broadly lunate, semi-orbicular, 

 obtuse with a large basal auricle; pod 3-5 cm. long and 6-7 mm. wide, pilose-canescent with 

 somewhat kinked hairs, strongly arcuate, sometimes almost forming a complete circle, acu- 

 minate at each end, slightly sulcate on the lower suture, cordate in cross-section. 



Type locality: Mohave Desert. 



Distribution: Southern Nevada and southeastern California. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 57, f. 186; Jepson, Man. Fl. PI. Calif./. 565. 



4. Hamosa Minthomiae Rydb. Bull. Torrrey Club 54: 15. 1927. 



A perennial, probably cespitose; stems low, strigose and striate; leaves erect, 5-10 cm. 



long; stipules ovate, 7-8 mm. long; leaflets 11-17, obovate, 8-15 mm. long, 4-6 mm. wide, 



silky-canescent, rounded at the apex; peduncles 8-12 cm. long; racemes 6-10 cm. long; bracts 



lanceolate or lance-linear, 5-6 mm. long; calyx black-hairy, the tube 5-6 mm. long, the teeth 



subulate, 2 mm. long; corolla white, with a purple-tipped keel; banner obovate, 15 mm. long; 



wings much shorter, the blade oblong-falcate, with a large rounded auricle; keel-petals still 



shorter, broadly lunate, rounded at the apex; pod oblong, straight or slightly arcuate, 2-2.5 



cm. long, 4 mm. thick and wide, shaggy-pilose, abruptly acute, obcordate in cross-section. 



Type locality: Vicinity of Pioche, Nevada. 

 Distribution: Southern Nevada. 



5. Hamosa Andersonii (A. Gray) Rydb. Bull. Torrey Club 

 54: 16. 1927. 



Astragalus Andersonii A. Gray, Proc Am. Acad. 6: 524. 1865. 

 Tragacantha Andersonii Kuntze, Rev. Gen. 943. 1891. 



A perennial, with a cespitose woody caudex; stems many, 1-3 dm. high, villous-canescent; 

 leaves ascending, 6-10 cm. long, rather long-petioled; stipules deltoid, 5-8 mm. long, acuminate, 

 villous, the lower connate; leaflets 13-17, obovate, 8-10 mm. long, 4—6 mm. wide, villous- 

 canescent; peduncles 3-5 cm. long; racemes dense at first, in age laxer, 3-5 cm. long; bracts 

 subulate, 4 mm. long; calyx villous-canescent, the tube about 4 mm. long and 3 mm. wide, 

 the teeth subulate, 3 mm. long; corolla white, or tinged with pink, about 1.5 cm. long; banner 



