FLOWERING PLANTS AND FERNS OF ARIZONA 129 



6. Aristida adscensionis L., Sp. PL 82. 1753. 



Aristida bromoides H. B. K., Nov. Gen. et Sp. 1: 122. 1815. 



Mohave and Yavapai Counties to the southern boundary, up to 

 6,000 feet but usually lower, dry mesas, deserts, and rocky slopes, 

 flowering whenever conditions are favorable. Western Missouri and 

 Texas to California and southward; warmer parts of the Old World. 



7. Aristida barbata Fourn., Mex. PL 2: 78. 1886. 



Aristida havardii Vasey, Torrey Bot. Club Bui. 13: 27. 1886. 



Coconino and Cochise Counties, dry slopes and mesas at medium 

 altitudes, May to October. Western Texas to Arizona and central 

 Mexico. 



8. Aristida divaricata Humb. et Bonpl. in Willd., Enum. PL 1: 99. 



1809. 

 Navajo and Coconino Counties to Santa Cruz and Pima Counties, 

 mostly 5,000 to 6,000 feet, rocky hills, July to September. Kansas 

 to southern California, south to Texas and Guatemala. 



9. Aristida hamulosa Henr., Meded. Rijks Herbarium Leiden 54: 



219. 1926. 

 Cochise, Santa Cruz, and Pima Counties, 2,400 to 5,300 feet, dry 

 slopes and mesas, June to September, type from Tucson (Tourney). 

 Western Texas to southern California, south to Guatemala. 



10. Aristida pansa Wool, and Standi., Contrib. U. S. Natl. Herbar- 



ium 16: 112. 191*3. 

 Coconino and Santa Cruz Counties, up to 5,000 feet, dry plains and 

 open ground, July to October. Texas to Arizona. 



11. Aristida glauca (Nees) Walp., Ann. Bot. 1: 925. 1849. 



Chaetaria glauca Nees, Linnaea 19: 688. 1847. 

 Aristida vaseyi Woot. and Standi., N. Mex. Col. Agr. Bui. 81: 

 55. 1912. 



Coconino and Mohave Counties to Cochise and Pima Counties, 

 1,000 to 5,200 feet, dry rocky slopes and plains, March to September. 

 Western Texas to Utah, Nevada, Arizona, and southern California, 

 south to central Mexico. 



12. Aristida purpurea Nutt., Amer. Phil. Soc. Trans, n. s. 5: 14."). 



1837. 



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

 Yuma Counties, up to 5,000 feet, dry rocky hills and plains. Arkansas 

 and Kansas to Utah, Arizona, southern California, and northern 

 Mexico. 



The var. laxi flora Merr., with capillary branches bearing 1 or 2 

 spikelets, is found in Cochise County {Griffiths 1880). 



13. Aristida fendleriana Steud., Syn. PL Glum. 1: 420. 1855. 

 Apache, Navajo, Coconino, Yavapai, Gila, and Cochise Counties, 



4,000 to 7,000 feet, mesas, dry hills, and open rocky ground. May to 

 August. South Dakota to Montana, south to Texas, Utah, Arizona, 

 and southern California. 



