FLOWERING PLANTS AND FERNS OF ARIZONA ] .") 1 



o. First glume of the sessile spikelet glabrous; sterile pedicel glabrous or 

 ciliate only near apex 2. A. cirkatus. 



3. Racemes paired or digitate on each peduncle (6). 



6. Pedicellate spikelet much reduced, the pedicel not always developed; 

 racemes 2, slender, partly enclosed in the narrow spathe, aggregate 

 in a dense silky inflorescence 6. A. glomeratus. 



6. Pedicellate spikelet staminate, similar to the sessile one; racemes 5 to 

 10 cm. long, 2 to 6 on each peduncle, long-exserted (7). 

 7. Rhizomes short or wanting; racemes inconspicuously hairy, pale or 

 tinged with purple; awn of the sessile spikelet 1 to 2 cm. long. 



4. A. FURCATUS. 



7. Rhizomes well developed; racemes conspicuously villous with golden 

 hairs; awn of the sessile spikelet rarely more than 0.5 cm. long. 



5. A. HALLII. 



1. Andropogon hirtiflorus (Xees) Kunth, Rev. Gram. 1: Sup. XXXIX. 



1830. 



Schizachyrium hirtijlorum Xees, Agrost. Bras. 334. 1829. 



Coconino, Cochise, Santa Cruz, and Pima Counties, 4,000 to 7,000 

 feet, canyons and rocky slopes, June to October. Western Texas to 

 Arizona and Mexico. 



The species is represented in Arizona by var.feensis (Fourn.) Hack. 

 (A.jeensis Youm.) . 



2. Andropogon cirratus Hack., Flora 68: 119. 1885. 



Schizachyrium cirratum Woot. and Stand., N. Mex. Col. Agr. 

 Bui. 81: 30. 1912. 



Greenlee, Pinal, Cochise, Santa Cruz, and Pima Counties, 2,000 to 

 6,500 feet, canyons and rocky slopes, August to October. Western 

 Texas to Arizona, southern California, and northern Mexico. 



3. Andropogon scoparius Michx., Fl. Bor. Amer. 1: 57. 1803. 



Schizachyrium scoparium Nash in Small, Fl. Southeast. U. S. 

 59, 1326. 1903. 



Navajo, Coconino, and Pima Counties, at medium altitudes, dry 

 plains and rocky hills, July to September. Quebec and Maine to 

 Alberta and Idaho, south to Florida and Arizona. 



The var. neomexicanus (Nash) Hitchc. {Schizachyrium neomexicanum 

 Nash) is a form with nearly straight racemes, the rachis and pedicels 

 conspicuously villous. It is found in Apache, Coconino, Yavapai, 

 and Cochise Counties. 



4. Andropogon furcatus Muhl. in Willd., Sp. PL 4: 919. 1S06. 

 White Mountains, Apache County (Griffith* 5407). Dry rocky 



hills, prairies, and open woods, Maine and Quebec to Saskatchewan 

 and Montana, south to Arizona and Mexico. 



5. Andropogon hallii Hack., Akad. Wiss. Wien Math.-Nat. Kl. 



Sitzber. 89 l : 127. 1884. 



Andropogon chrysocomus Nash in Britton, Man. 70. 1901. 



Coconino and Cochise Counties, at medium altitudes, sandy plains, 



dry hills, and open pine woods, July to September. North Dakota, 

 and eastern Montana to Texas, Wyoming, Utah, and Arizona. 



