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



9. Bouteloua trifida Thurb. in S. Wats., Amer. Acad. Arts and Sci. 



Proc. 18: 177. 1883. 

 Mohave, Maricopa, Pima, and Santa Cruz Counties, mostly 2,000 

 to 4,000 feet, mesas and dry rocky hillsides, March to June, and some- 

 times in October. Texas to southwestern Utah, Arizona, southern 

 California, and Mexico. 



10. Bouteloua aristidoides (H. B. K.) Griseb., Fl. Brit. West Indies 



537. 1864. 



Dinebra aristidoides H. B. K., Nov. Gen. et Sp. 1: 171. 1816. 

 Bouteloua aristidoides var. arizonica M. E. Jones, Contrib. 

 West. Bot. 14: 13. 1912. 



Greenlee County to Mohave County, south to the southern border, 

 up to 5,500 feet, deserts, dry mesas, and rocky hillsides, June to Octo- 

 ber. Texas to southern California and northern Mexico; Argentina. 



11. Bouteloua chondrosioides (H. B. K.) Benth. ex S. Wats., Amer. 



Acad. Arts and Sci. Proc. 18: 179. 1883. 



Dinebra chondrosioides H. B. K., Nov. Gen. et Sp. 1: 173. 1816. 



Cochise, Santa Cruz, and Pima Counties, 2,000 to 5,200 feet, rocky 

 hills, August to October. Western Texas, southern Arizona, and 

 Mexico. 



12. Bouteloua eludens Griffiths, Contrib. U. S. Natl. Herbarium 14: 



401. 1912. 

 Rocky hills in the Santa Catalina and Santa Rita Mountains (Pima 

 County), August to September, type from the Santa Rita Mountains 

 (Griffiths 7269). Arizona and Sonora. 



13. Bouteloua radicosa (Fourn.) Griffiths, Contrib. U. S. Natl. 



Herbarium 14: 411. 1912. 



Atheropogon radicosus Fourn., Mex. PL 2: 140. 1886. 



Apache, Cochise, Santa Cruz, and Pima Counties, 3,700 to 6,800 

 feet, rocky hills and canyons, August to September. New Mexico to 

 southern California and Mexico. 



14. Bouteloua filiformis (Fourn.) Griffiths, Contrib. U. S. Natl. 



Herbarium 14: 413. 1912. 



Atheropogon jilijormis Fourn., Mex. PL 2: 140. 1886. 



Mohave, Greenlee, Cochise, Santa Cruz, and Pima Counties, below 

 5,000 feet, mesas and rocky foothills, July to October. Texas to 

 Arizona and Mexico. 



15. Bouteloua curtipendula (Michx.) Torr. in Emory, Mil. Reconn. 



154. 1848. 

 Chloris curtipendula Michx., Fl. Bor. Amer. 1: 59. 1803. 



Navajo and Coconino Counties south to Cochise, Santa Cruz, and 

 Pima Counties, up to 7,000 feet, dry rocky hills and canyons, April to 

 October. Maine and Ontario to Montana, south to Maryland, 

 Alabama, Texas, Arizona, and southern California. 



57. CATHESTECUM 



Stoloniferous perennial with relatively short, flat leaf blades and 

 several V-shaped or rhomboid spreading spikes arranged on opposite 



