488 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



62. Astragalus layneae Greene, Calif. Acad. Sci. Bui. 1: 156. 1885. 



Hamosa layneae Rydb., Torrey Bot. Club Bui. 54: 15. 1927. 



Chloride, 15 miles north of, Mohave County (Jones, and Kearney 

 and Peebles 11210), sandy soil, April. Northwestern Arizona, southern 

 Nevada, and southeastern California. 



Unmistakable when in fruit, the long, somewhat prominently 

 veined, thick-walled pods being curved so as often to form a nearly 

 complete circle. 



63. Astragalus scaposus A. Gray, Amer. Acad. Arts and Sci. Proc. 13: 



366. 1878. 



Hamosa scaposa Rydb., Torrey Bot. Club Bui. 32: 659. 1906. 



Apache County to eastern Mohave and northern Yavapai Counties, 

 3,500 to 6,500 feet, common on rocky slopes and mesas, often with 

 juniper and piny on, April and May, type from Mokiak Pass (Mohave 

 County). Colorado to Nevada, New Mexico, and northern Arizona. 



The silvery-sericeous foliage and the purple and white flowers make 

 this an attractive little plant. It is closely related to A. calycosus 

 Torr. and perhaps only varietally distinct. Specimens from the 

 Grand Canyon (Collom in 1940) with narrowly elliptic or oblanceolate 

 leaflets and long and slender calyx teeth are indistinguishable from 

 A. calycosus. 



64. Astragalus ensiformis M. E. Jones, Calif. Acad. Sci. Proc. ser. 2, 



5: 658. 1895. 



Hamosa ensijormis Rydb., Torrey Bot. Club Bui. 54: 21. 

 1927. 



Near Kayenta, Navajo County (Peebles and Fulton 11928), head of 

 Grand Wash near Pagumpa Springs, Mohave County (Jones 5095ah, 

 the type collection), about 5,000 feet, known only from the collections 

 cited. 



65. Astragalus arizonicus A. Gray, Amer. Acad. Arts and Sci. Proc. 



7: 398. 1868. 



Hamosa arizonica Rydb., Torrey Bot. Club Bui. 54: 22. 1927. 



Coconino and Mohave Counties to Graham, Santa Cruz, and 

 Pima Counties, 4,500 feet and lower, common on plains and mesas, 

 March to May, type from near Camp Grant, Graham County. New 

 Mexico, Arizona, and Sonora. 



The radiating, nearly prostrate stems, narrow, silvery-sericeous 

 leaflets and dingy-purple flowers are characteristic. The species has 

 been reported to cause loco disease, but apparently this has not been 

 proved experimentally. 



66. Astragalus nothoxys A. Gray, Amer. Acad. Arts and Sci. Proc. 



6: 232. 1864. 



Hamosa nothoxys Rydb., Torrey Bot. Club Bui. 54: 330. 1927. 

 Hamosa gooddingii Rydb., ibid. p. 20. 



Graham, Gila, Maricopa, Pinal, Cochise, Santa Cruz, and Pima 

 Counties, 1,600 to 6,000 feet, common on slopes and mesas, often with 

 live oaks, March to May, type of H. gooddingii from the Huachuca 



