FLOWERING PLANTS AXD FERNS OF ARIZONA 99 



3. Triodia pilosa (Buckl.) Merr., U. S. Dept. Agr., Div. Agrost. Cir. 



32: 9. 1901. 



Uralepis pilosa Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 

 94. 1862. 



Coconino, Mohave, Yavapai, Gila, and Santa Cruz Counties, up to 

 5,500 feet, plains and rocky hills. Kansas to Nevada, south to central 

 Mexico. 



4. Triodia elongata (Buckl.) Scribn., U. S. Dept. Agr., Div. Agrost. 



Bui. 17 (ed. 2): 210. 1901. 



Uralepis elongata Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 

 89. 1862. 



Coconino, Yavapai, and Greenlee Counties, 3,500 to 7,000 feet, 

 plains and rocky slopes, August to October. Missouri and Kansas to 

 Arkansas and Arizona. 



5. Triodia mutica (Torr.) Scribn., Torrev Bot. Club Bui. 10: 30. 



1883. 



Tricuspis mutica Torr., U. S. Rpt. Expl. Miss. Pacif. 4: 156. 

 1857. 



Coconino, Mohave, Yavapai, Pinal, Cochise, Santa Cruz, and Pima 

 Counties, up to 5,500 feet, dry plains and rocky hills, April to October. 

 Texas to southeastern California. 



16. COTTEA. Cottagrass 



Small tufted perennial with flat leaf blades and narrow or oblong, 

 rather dense panicles; glumes nearly equal, about as long as the lowest 

 floret, several-nerved; lemmas rounded on the back, villous below, 

 with 9 to 11 prominent nerves extending into teeth or- awns; palea a 

 little longer than the body of the lemma. 



1. Cottea pappophoroides Kunth, Rev. Gram. 1: 84. 1829. 



Cochise and Pima Counties, 2,000 to 4,000 feet, dry hills and plains. 

 August to October. Western Texas to southern Arizona and cent nil 

 Mexico; South America. 



17. PAPPOPHORUM. Pappusgrass 



Tufted perennials with narrow, spikelike, bristly panicles; spikelets 

 2- to 5-flowered, the rachilla disarticulating above the glumes but not, 

 or only tardily, between the florets, these falling together; glumes near- 

 ly equal; lemmas rounded on the back, obscurely many-nerved; palea 

 as long as the body of the lemma. 



Key to the species 



1. Awns plumose; culms 20 to 40 cm. high, branching, decumbent at base, the 

 nodes pubescent; panicles mostly less than 5 cm. long, plumbeous. 



1. P. WRIGHTII. 



1. Awns scabrous, not plumose: culms mostly 50 to 100 cm. high, simple, the 

 nodes glabrous: panicles 10 to 20 cm. long, tawny or tinged with purple 2 . 



2. Panicle spikelike, tawny or whitish 2. P. MUCRONULAtum. 



2. Panicle narrow but loose, pinkish 3. P. bicolor. 



