436 NORTH AMERICAN FLORA [Volume 24 



semiorbicular, rounded and purple at the tip; pod glabrous, lanceolate in outline, falcate, 

 12-16 mm. long, 3 mm. wide and thick, cordate in cross-section. 



Type locality: Esperanza, Puebla. 



Distribution: San Luis Potosi to Jalisco and Hidalgo. 



Illustration: M. E. Jones. Rev. Astrag. pi. 70, f. 253, 254. 



55. Hamosa parva (Hemsl.) Rydb. Bull Torrey Club 

 54: 335. 1927. 



Astragalus parvus Hemsl.. Biol. Centr. Am. Bot. I: 266. 1880. 

 Tragacantha parva Kuntze, Rev. Gen. 947. 1891. 

 Astragalus Schaffneri M. E. Jones, Rev. Astrag. 276. 1923. 



A cespitose perennial, with a taproot; stems numerous, slender, terete, sparingly strigose, 

 1-2 dm. long; leaves ascending, 4-6 cm. long, the rachis strigose; stipules lanceolate, 3-4 mm. 

 long, green; leaflets 11-17, linear, 5-10 mm. long, 1-2 mm. wide, glabrous above, strigose 

 beneath, obtuse at the apex; peduncles 5-8 cm. long; racemes 1-2 mm. long; bracts subulate, 

 2 mm. long; pedicels 1 mm. long; calyx white-strigose, the tube 2 mm. long, the teeth subulate, 

 1.5 mm. long; corolla purplish, about 8 mm. long; banner narrowly obovate, strongly arched 

 at the middle; wings about as long, the blade oblanceolate, falcate; keel-petals much shorter, 

 the blade nearly semiorbicular; pod lanceolate in outline, about 12 mm. long, 3 mm. thick and 

 nearly as wide, slightly arcuate, white-strigose. 



Type locality: San Luis Potosi. 

 Distribution: San Luis Potosi. 

 Illustrations: M. E. Jones, Rev. Astrag. pi. 69, f. 250, 251; pi. 70, f. 251. 



56. Hamosa asperula Rydb. Bull. Torrey Club 54: 335. 1927. 



A cespitose perennial, with a woody root and caudex; stems decumbent or spreading, 1-2 

 dm. long, purplish, appressed-pubescent with short stiff hairs; leaves 3-5 cm. long, spreading, 

 the rachis pubescent, sulcate on the upper side; stipules connate, deltoid, acuminate, mem- 

 branous; leaflets 13-23, linear, 6-12 mm. long, glabrous above, strigose beneath, more or less 

 involute; peduncles 3-6 cm. long; racemes dense, 1-3 cm. long; bracts lanceolate, membranous, 

 2-3 mm. long; pedicels 1 mm. long; calyx black-hairy, the tube 2.5 mm. long, campanulate, 

 the teeth subulate, 2.5 mm. long; corolla purplish, 8 mm. long; banner obovate, strongly 

 arcuate; wings nearly as long, the blade broadly obovate; keel-petals shorter, broadly lunate, 

 the blade nearly semiorbicular, obtuse; pod falcate, strigose, 14-16 mm. long, 2-6 mm. broad 

 and high, tapering at the apex. 



Type locality: Between Pachuca and Real del Monte, Hidalgo. 

 Distribution: Known only from the type locality. 



57. Hamosa hypoxyla (S. Wats.) Rydb. Bull. Torrey Club 

 54:336. 1927. 



Astragalus hypoxylus S. Wats. Proc. Am. Acad. 18: 192. 1883. 



A perennial, with a prostrate branching woody base, and short herbaceous branches of the 

 season, these less than 5 cm. long, minutely strigose; leaves 2-4 cm. long, spreading; stipules 

 distinct, deltoid, strigose, 1-1.5 mm. long; leaflets 9-13, obovate or elliptic, 3-6 mm. long, 

 rounded at the apex, strigose beneath, glabrous above; peduncles 5-7 cm. long; racemes short, 

 spike-like, 1-2.5 cm. long; bracts lanceolate, 1-2 mm. long; calyx strigose, the tube about 2 

 mm. long, and nearly as broad, the teeth subulate, 2 mm. long; corolla about 6 mm. long; 

 banner obovate, abruptly arcuate; wings nearly as long, the blade oblong; keel-petals much 

 shorter, acute; pod ascending, sessile, about 1 cm. long, 3 mm. wide and as thick, strigose, 

 slightly arcuate, acute on the upper suture, sulcate on the lower, 2-celled, cordate in cross- 

 section. 



Type locality': Maloney's Range. Huachuca Mountains, Arizona. 

 Distribution: Known only from the type locality. 

 Illustration: M. E. Jones, Rev. Astrag. pi. 70, f. 255. 



