WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 69 
Lemmas scabrous or glabrous. 
Panicles dense, obtuse, 5 to 10 
mm. wide..........-..---.--. 13. M. wrightit. 
Panicles rather lax, tapering at 
the apex, less than 5 mm. 
wide.......-.. lee eee eee eee 14. M. cuspidata. 
Lemmas with conspicuous long awns. 
Leaf sheaths very broad at the base and 
papery, loose, not closely investing 
the stems. 
Second glume 3-toothed; lemma 
pubescent at the top........... 17. M. trifida. 
Both glumes acute or acuminate; lem- 
mas pubescent only below...... 18. M. virescens. 
Leaf sheaths not broad and papery, closely 
investing the stems. 
Spikelets on long slender pedicels. 
Second glume entire at the apex. 19. M. affinis. 
Second glume sharply 3 to 5- 
toothed..............-.---. 20. M. subalpina. 
Spikelets on short stout pedicels, or 
sessile. 
Awns about 5 mm. long; stems 
stout; internodes long..... 21. M. acuminata. 
Awns about 20 mm. long; stems 
slender, wiry; internodes 
short..........------------ 22. M. monticola. 
~ 1. Muhlenbergia emersleyi Vasey, Contr. U.8. Nat. Herb. 3: 66. 1892. 
Muhlenbergia vaseyana Scribn. Rep. Mo. Bot. Gard. 10: 52. 1899. 
Type Locauity: ‘‘Rocky Cafion, Arizona.”’ 
Rance: Western Texas to southern Arizona and adjacent Mexico. 
New Mexico: Silver City; Mogollon Mountains; Santa Rita; Animas Valley; 
Organ Mountains; Dona Ana Mountains. Dry hills, in the Upper Sonoran Zone. 
2. Muhlenbergia porteri Scribn.; Beal, Grasses N. Amer. 2: 259. 1898. 
MESQUITE GRASS. 
Typr Locairy: Texas. 
RanaeE: Colorado and western Texas to California and Mexico. 
New Mexico: Mangas Springs; Albuquerque; Organ Mountains; Tortugas Moun- 
tain; Mesilla Valley; Dona Ana Mountains; Jarilla; Arroyo Ranch. Hills and mesas, 
in the Lower and Upper Sonoran zones. 
Mesquite grass receives its name from the fact that, in the southern part of the State, 
where it is very common, it is nearly always found growing in the shade of mesquite 
bushes, its slender, lax stems often clambering over them. Cattle are very fond of it 
and will force their way into the mesquite to reach the grass. 
“ 8. Muhlenbergia pungens Thurb. Proc. Acad. Phila. 1863: 78. 1864. 
PURPLE HAIR GRASS. 
TypE Locatiry: Colorado. 
Rance: Utah and Nebraska to Arizona and Texas. 
New Mexico: Carrizo Mountains; Zuni Reservation; Chama River; Los Pilares; 
on the San Juan; White Sands. Sandhills and on plains, in the Lower and Upper 
Sonoran zones. 
