478 MISC. PUBLICATION 423, U. S. DEPT. OF AGRICULTURE 



Mohave County (Goodding 4776, Peebles and Parker 14710), 5,000 

 to 6,000 'feet. May. Colorado, Utah, New Mexico, and Arizona. 



Prefers soils of relatively high selenium content and is probably 

 poisonous. 



9. Astragalus moencoppensis M. E. Jones, Zoe 2: 12. 1891. 



Cnemidophacos moencoppensis Rydb., North Amer. Fl. 24: 286. 

 1929. 



Navajo County and eastern Coconino County, 3,700 to 5,500 feet, 

 May and June, type from Willow Spring, Coconino County (Jones 

 in 1890). Southern Utah and northeastern Arizona. 



10. Astragalus sophoroides M. E. Jones, Zoe 2: 12. 1891. 



Cnemidophacos sophoroides Rydb., North Amer. Fl. 24: 286. 

 1929. 



Eastern Coconino County, 4,500 to 5,000 feet, May and June, type 

 from Willow Spring (Jones in 1890). Known only from northern 

 Arizona. 



11. Astragalus troglodytus S. Wats., Amer. Acad. Arts and Sci. Proc. 



20: 362. 1885. 



Cnemidophacos troglodytus Rydb., North Amer. Fl. 24: 288. 

 1929. 



Kaibab Plateau, San Francisco Peaks, Mogollon Escarpment near 

 Oak Creek, and Williams to Ash Fork (Coconino County), 6,500 to 

 7,500 (?) feet, among yellow pines, April and May, type from the 

 San Francisco Peaks (Lemmon in 1884). Known only from northern 

 Arizona. 



The flowers apparently are red when fresh, a color unique among 

 the Arizona species. The plant is characterized also by subacaulescent 

 habit and strongly reflexed bracts. 



12. Astragalus amphioxys A. Grav, Amer. Acad. Arts and Sci. Proc. 



13: 366. 1878. 



Xylophacos amphioxys Rydb., Torrey Bot. Club Bui. 32: 662. 

 1906. 



Apache County to Mohave County, 2,000 to 7,500 feet, April to 

 June. Texas to southern Utah and northern Arizona. 



A form distinguished, apparently, only by the presence of black hairs 

 on the calyx, var. melanocalyx (Rydb.) Tidestrom (Xylophacos mela- 

 nocalyx Rydb.), is found chiefly in northern Mohave County, 1,800 to 

 4,000 feet, sandy plains. 



13. Astragalus pephragmenus M. E. Jones, Zoe 4: 267. 1893. 



Xylophacos pephragmenus Rydb., Torrey Bot. Club Bui. 52: 

 151. 1925. 



Navajo County to Hualpai Mountain (Mohave County), and 

 Greenlee, Gila, and Yavapai Counties, 4,000 to 7,000 feet, yellow pine 

 forest, April to May, type from the Pinal Mountains (Jones in 1890). 

 Southern Utah, New Mexico, and Arizona. 



