WOOTOJST AND STANDLEY FLOEA 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 locality: 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. 



8. Bouteloua breviseta Vasey, Contr. U. S. Nat. Herb. 1: 58. 1890. 

 Type locality: Screw Bean, Presidio County, Texas. 



Range: 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 4 : 141. 1805. Hairy grama. 

 Chondrosium hirtum H. B. K. Nov. Gen. & Sp. 1: 176. pi. 59. 1816. 

 Chondrosium foeneum Torr. in Emory, Mil. Reconn. 154. pi. 12. 1848. 



Type locality: Described from cultivated plants. 



Range: 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. Norn. Bot. ed. 2. 1: 219. 1840. 



Blue grama. 



Chondrosium gracile H. B. K. Nov. Gen. & Sp. 1: 176. pi. 58. 1816. 



Aiheropogon oligostachyum Nutt. Gen. PI. 1: 178. 1818. 



Bouteloua oliyostachy a Torr.; A.Gray, Man. ed. 2. 553. 1853. 



Type locality: "Crescit in crepidinibus et devexis montis porphyritici La Buffa 

 de Guanaxuato Mexicanorum, alt. 1270 hexap." 



Range: 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 become 

 knee-high, and a huge field in such a condition is a beautiful Bight because <<i the 

 myriads of purple spikes. The grass is resistant to overgrazing and i- able to Bpread 

 rapidly "u lien 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 Hat leaves and rather showy inflorescence of 2 to mans 

 digitate spik< ; spikelets I -dowered, awned, sessile in 2 rows along one .-id <■ of a con- 

 tinuous rachis, forming unilateral spikes; rachilla jointed above the glumes and pro- 

 duced beyond the palea, hearing l or more empty rudimentary aw aed glumes; glumes 

 unequal, lanceolate, acute, somewhal keeled; lemma narrow or broad, I toS-nerved, 

 acute- to truncate or emarginate or 2-lobed, often filiate on the hack or margins, the 

 middle nerve usually prolonged into an awn; grain free. 



