/ 
y’ 
WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 87 
7. Bouteloua eriopoda Torr. U.S. Rep. Expl. Miss. Pacif. 4: 155. 1856. 
BLACK GRAMA. 
Chondrosium eriopodum Torr. in Emory, Mil. Reconn. 154. 1848. 
Type Locatiry: Along the Rio Grande, New Mexico. Type collected by Emory. 
RanGe: Arizona and western Texas to Mexico. 
New Mexico: Common throughout the State except in the extreme northeast. 
Dry hills and plains, in the Lower and Upper Sonoran zones. 
This is one of the most valuable range grasses in the southern part of New Mexico. 
“ §. Bouteloua breviseta Vasey, Contr. U. 8S. Nat. Herb. 1:58. 1890. 
Type LOcALITy: Screw Bean, Presidio County, Texas. 
Rance: Western Texas and southern New Mexico. 
New Mexico: White Sands; Lakewood; Carlsbad. Dry plains, in the Lower Sono- 
ran Zone. 
9. Bouteloua hirsuta Lag. Var. Cienc. 2*: 141. 1805. Harry GRAMA. 
Chondrosium hirtum H. B. K. Nov. Gen. & Sp. 1: 176. pl. 59. 1816. 
Chondrosium foeneum Torr. in Emory, Mil. Reconn. 154. pl. 12. 1848. 
Tyre Locatity: Described from cultivated plants. 
Ranae: Colorado and Nebraska to Mexico and Florida. 
New Mexico: Pecos; Clayton; Nara Visa; Silver City; Socorro; Torrance; Organ 
Mountains; Dona Ana Mountains; Leachs; Buchanan. Dry hills, in the Lower and 
Upper Sonoran zones. 
The type of Chondrosium foeneum was collected by Emory along the Rio Grande. 
10. Bouteloua gracilis (H. B. K.) Lag.; Steud. Nom. Bot. ed. 2. 1: 219. 1840. 
BLUE GRAMA. 
Chondrosium gracile H. B. K. Nov. Gen. & Sp. 1: 176. pl. 58. 1816. 
Atheropogon oligostachyum Nutt. Gen. Pl. 1: 178. 1818. 
Bouteloua oligostachya Torr.; A. Gray, Man. ed. 2. 553. 1853. 
Type Locairy: ‘‘Crescit in crepidinibus et devexis montis porphyritici La Buffa 
de Guanaxuato Mexicanorum, alt. 1270 hexap.”’ 
Rance: British America to California, Missouri, and Mexico. 
New Mexico: Common throughout the State except at lower levels. Meadows 
and hillsides, in the Upper Sonoran and Transition zones. 
Blue grama is undoubtedly the most valuable forage plant of New Mexico. It 
occurs generally on the higher plains and lower mountains at altitudes of from 1,800 
to 2,400 meters, often forming nearly pure stands. When not molested it becomes 
knee-high, and a large field in such a condition is a beautiful sight because of the 
myriads of purple spikes. The grass is resistant to overgrazing and is able to spread 
rapidly when not too closely grazed. 
This has generally been known as Bouteloua oligostachya, a name which, unfortu- 
nately, lacks priority. 
49. CHLORIS Swartz. 
Mostly perennials with flat leaves and rather showy inflorescence of 2 to many 
digitate spikes; spikelets 1-flowered, awned, sessile in 2 rows along one side of a con- 
tinuous rachis, forming unilateral spikes; rachilla jointed above the glumes and pro- 
duced beyond the palea, bearing 1 or more empty rudimentary awned glumes; glumes 
unequal, lanceolate, acute, somewhat keeled; lemma narrow or broad, 1 to 3-nerved, 
acute to truncate or emarginate or 2-lobed, often ciliate on the back or margins, the 
middle nerve usually prolonged into an awn; grain free. 
