Part 5, 1929] FABACEAE: GALEGEAE 297 



15. Xylophacos cyaneus (A. Gray) Rydb. Bull. Torrey Club 

 52: 154. 1925. 



Astragalus cyaneus A. Gray, Mem. Am. Acad. II. 4: 34. 1854. 

 Astragalus Shortianus minor A. Gray. Proc. Am. Acad. 6: 211. 1864. 

 Tragacantha cyanea Kuntze, Rev. Gen. 944. 1891. 

 Astragalus stipularis M. E. Jones, Contr. W. Bot. 7: 655. 1895. 

 Astragalus Shortianus cyaneus M. E. Jones. Contr. W. Bot. 8: 5. 1898. 

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



A perennial, with acespitosecaudex; stems less than 1 dm. high, densely strigose-canescent; 

 leaves 5-8 cm. long; stipules broadly deltoid, about 2 mm. long, canescent; leaflets 11-17, 

 elliptic, 5-10 mm. long, 2-5 mm. wide, grayish-canescent on both sides, acute or obtuse at the 

 apex; peduncles 3-7 c/n. long; bracts lanceolate, 3-5 mm. long; racemes 5-12; calyx strigose- 

 canescent, the tube 5-6 mm. long, the teeth subulate, nearly 3 mm. long; corolla bluish- 

 purple, about 15 mm. long; banner obovate, arched at the middle; wings slightly shorter, the 

 blade oblong, about equaling the claw, with a large basal auricle; keel-petals still shorter, 

 strongly lunate, with a rounded apex ; pod oblong-ovoid, slightly arcuate, rounded at the base, 

 acuminate at the apex, strigose and cross-reticulate, about 2 cm. long, 5 mm. wide, and 8 mm. 

 thick. 



Type locality: Santa Fe, New Mexico. 



Distribution: Arizona to Colorado. Oklahoma, and Texas. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 46; Contr. W. Bot. 10: pi. 4 (as .4. Shortianus 

 minor). 



16. Xylophacos brachylobus (A. Gray) Rydb. Bull. Torrey Club 

 52: 154. 1925. 



Astragalus amphioxys brachylobus A. Gray, Proc. Am. Acad. 13: 367. 1878. 



A perennial, with a cespitose caudex; stems less than 1 dm. high, strigose-canescent, much 

 branched and leafy; leaves ascending, 5-8 cm. long; stipules deltoid, strigose, 3 mm. long; 

 leaflets 9-21, oval, usually acute, 5-10 mm. long, 3-5 mm. wide, strigose-canescent on both 

 sides; peduncles 2-5 cm. long; raceme 3-9-flowered; bracts lanceolate, 5 mm. long, strigose; 

 calyx strigose-canescent, the tube 7—8 mm. long, the teeth subulate, less than 2 mm. long; 

 corolla bluish-purple, fully 2 cm. long; banner obovate, notched at the apex, moderately arcuate; 

 wings nearly as long, the blade falcate-oblong; keel-petals shorter, broadly lunate; pod lunate, 

 strigose, somewhat arcuate, 2.5 cm. long, obtuse at the base, acuminate at the apex, suleate on 

 the lower suture. 



Type locality - : Arizona. 



Distribution: Southern Nevada to Arizona. New Mexico, and southern Colorado. 



17. Xylophacos Tidestromii Rydb. Bull. Torrey Club 



52: 155. 1925. 



A perennial, with a deep woody root and short cespitose caudex, subacaulescent; stems 



1-5 cm. long, white-woolly; leaves 5-8cm. long, spreading; stipules broadly deltoid, about 5 mm. 



long; leaflets 11-15, broadly obovate, 6-12 mm. long and nearly as broad, densely white-silky- 



villous on both sides, cuneate at the base, rounded at the apex; peduncles 5-7 cm. long; racemes 



2-4 cm. long; bracts lanceolate, 2-4 mm. long; calyx with mixed white and black hairs, the 



tube 6-8 mm. long, the teeth subulate, 2 mm. long; corolla unknown, except the keel-petals, 



which are 12 mm. long, the blade broadly lunate, with a large auricle, purple-tipped, shorter 



than the claw; pod tapering at each end, strongly arched above the middle, strigose-canescent, 



cross-reticulate, about 4 cm. long, 4 mm. wide, and nearly 1 cm. thick. 



Type locality - : Charleston Mountains, Nevada. 

 Distribution: Southern Nevada. 



18. Xylophacos castaneaeformis (S. Wats.) Rydb. Bull. Torrey 

 Club 52: 155. 1925. 



Astragalus castaneaeformis S. Wats. Proc. Am. Acad. 20: 361. 1885. 



Astragalus argophyllus castaneaeformis M. E. Jones, Contr. W. Bot. 10: 62. 1902. 



A perennial, with a deep root and cespitose caudex; stems very short, less than 5 cm. long, 

 leafy, mostly covered by the stipules; leaves 5-8 cm. long, ascending; stipules deltoid, 3-5 mm. 



