CI1L0KI1)E.E. 413 



tana. Unmnl, CanUj cf- Svrihnrr 37G; Texas, DrummomJ 3(j0, 

 liuUdider; Mexico, Fendhr HOI. 



From Illinois to Texas, Kansas, Colorado, Montaua, and Cali- 

 fornia. 



!»0. (181). BOUTELOUA Lag. Var. Cienc. 3: Part 4, i;54 (ISOo). 

 GiiAMA-cRASs. MrsgiiT-iJKAss. Athci'opoyon Mulil. Willd. 

 Sp. IM. 4:937 (180.-,). Ileterosteca Desv. Nov. IJull. So.-. 

 Philom. 2:188 (1810). Triafhcm Dosv. 1. c. Corethnim Vahl, 

 Skr. Xaturk. Solsk. Kiobonh. 0:85 (1810). Chondrosium Desv. 

 Joiirn. Hot. 3:G8 (1813). Buiebra DC. Cat. Hort. Mons. 104 

 (1813) in part. Truciin II. H. K. Xov. Gen. et Sp. 1 178 

 (1815.) Poli/ndoti 1. c. 174 (1815). Ifeferosfef/a Knntli, Mom. 

 Mas. Par. 2:73 (1815). Actiiiuvhha Willd. H. Ot S. Syst. 2:22, 

 417 (1817). Eutviana Trin. Fund. Agrost. 101 (1820). Aris- 

 fiditnn Endl. (ien. 94 (183G). rripJalhem Eudl. 1. c. Xesflem 

 Willd. Steiul. Norn. Ed. 2, 2:192 (1841). 



Under each synonym above gi\en may be found synonyms for 

 species. 



Spikelets 1-2 flowered, complanate, sessile and densely crowded 

 in 2 rows on one side of a flattened rachis, rachilla continuous or 

 articulate above the lower glumes, bearing 1-3 glumes or bristles or 

 rai'oly staminate flowers above the single })erfect flower. Empty 

 glumes 2, narrow, acute, keeled, equal or unequal; floral glume 

 broader, usually firmer, 3-toothed or 3-cleft at the aj^ex: empty 

 glumes at the apex of the rachilla 3-5-awned or deeply divided ; 

 palca of the perfect floret narrow, hyaline, entire or 2-toothed. 

 Stamens 3, usually orange-colored or red. Lodicules 2, fleshy. 

 Styles distinct. Grain oblong, included, but not adherent. Slen- 

 der annuals or perennials, low or tall, blades narrow, flat or convo- 

 lute. Spikes single and terminal, or several on the side of the axis, 

 first erect, finally drooping. 



There are about 25 species, all American. Bentham divided tho 

 genus into 3 sections, founded mainly on the inflorescence. Plants 

 of this genus are most abundant in the warmer and dryer portions 

 of Xorth America, especially in western Texas, in Arizona and 



