WOOTON AND STANDLEY FLORA OF NEW MEXICO. 69 



Lemmas scabrous or glabrous. 



Panicles dense, obtuse, 5 to 10 



mm. wide 13. M. wrightii. 



Panicles rather lax, tapering at 

 the apex, less than 5 mm. 



wide 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. viresczns. 



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. S. Nat. Herb. 3: 66. 1892. 

 Muhlenbergia vaseyana Scribn. Rep. Mo. Bot. Gard. 10: 52. 1S99. 



Type locality: "Rocky Canon, Arizona." 



Range: Western Texas to southern Arizona and adjacent Mexico. 

 New Mexico: Silver City; Mogollun 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. 



Type locality: Texas. 



Range: Colorado and western Texas to California and Mexico. 



New Mexico: Mangas Springs; Albuquerque; Organ Mountains; Tortugas Moun- 

 tain; Mcsilla Vallej ; Dona Ana Mountains; Jarilla: Arroyo Ranch. Hills and in. 

 in the Lower and Upper Sonoran zones. 



Mesquite grass receives its name from the fact dial, in the southern pari of the Siatc, 

 where ii is ■■. cry common, ii is nearly always found growing in the shade of mesquite 

 bushes, it slender, lax stems often clambering over them. Cattle arc verj fond of it 

 ami will force their way into the mesquite t" reach the grass. 



3. Muhlenbergia pungens Think Proc. Acad. 1'hila. 1863: 78 L864 



Pi i.fl i: II UK I 



Type i "< ujtt: Colorado. 

 I: ge: Utah and Nebraska to Arizona and T< 



Ni.u Mi hco Carrizo Mountain.-: Xuni Reservation; Chains River; Los I'll, 

 on the San Juan; White Sands. Sandhills ami on plaint in the Lowei and Upper 



ran zones. 



