90 CONTEIBUTIONS FROM THE NATIONAL HERBAEIUM. 



New Mexico: Mesilla Valley. Wet ground. 



This gi'ass, the largest of all those found in New Mexico, is frequent along ditches in 

 the Rio Grande Valley, where it has probably been introduced. 



55. MUNROA Torr. 



Low, diffusely much branched anniial with short sharp-pointed leaves clustered at 

 the ends of the branches; spikelets 2 to 4-flowered, 3 to 5 together and nearly sessile 

 in the axis of the floral leaves; rachilla jointed above the glumes; glumes lanceolate, 

 acute, hyaline, 1-nerved; lemmas longer, 3-nerved, entire, retuse, or 3-cleft, the 

 midnerve or all the nerves excurrent as short mucronate points; palea hj^aline, 

 2-keeled; stamens 3; styles distinct, elongated; grain inclosed within the lemma, 

 free. 



1. Miinroa squarrosa (Nutt.) Torr. U. S. Rep. Expl. Miss. Pacif. 4: 158. 1856. 



Cnjpsis squarrosa Nutt. Gen. PI. 1: 49. 1818. 



Type locality: "On arid plains near the 'Grand Detour' of the Missouri, almost 

 exclusively covering thousands of acres." 



Range: Alberta and South Dakota to Arizona and Texas. 



New Mexico: Common throughout the State. Dry plains and low hills, in the 

 Lower and Upper Sonoran zones. 



56. DASYOCHLOA Willd. 



Low, densely tufted, often creeping perennial, with very narrow, somewhat rigid 

 leaves and crowded spikelets in clusters of 3 to 6, equaled or exceeded by the upper 

 leaves; spikelets several-flowered, sessile; glumes unequal, keeled; lemmas thin, 

 densely hairy below, deeply bilobate, awned from between the rounded lobes; sta- 

 mens 3. 



1. Dasyochloa piUcheUa (H. B. K.) Willd.; Steud. Norn. Bot. ed. 2. 1: 484. 1840. 



Triodia piilchella H. B. K. Nov. Gen. & Sp. 1: 155. pi. 47. 1816. 



Type locality: "In subfrigidis, siccis, apricis regni Mexican! inter Guanaxuato, 

 Mina de Belgrade et Cubilente, alt. 1050 hexap." 



Range: Western Texas to Arizona, south into Mexico. 



New Mexico: Shiprock; Carrizo Mountains; Albuquerque; Mangas Springs; 

 Socorro; Tortugas Mountain; Mesilla Valley; Orogrande; Roswell. Sandy mesas, in 

 the Lower and Upper Sonoran zones. 



57. ERIONEURON Nash. 



Tufted perennials with thick linear leaves having white margins, and dense, con- 

 tracted, almost capitate panicles; spikelets several to many-flowered; glumes narrow, 

 acuminate; lemmas broad, 3-nerved, pubescent on the nerves below and sometimes 

 on the body of the lemma at the base, the apex acuminate, entire or slightly 2-toothed, 

 the awn terminal or arising between the minute teeth ; stamens 3 ; style short, distinct. 



1. Erioneuron pilosum (Buckl.) Nash in Small, Fl. Southeast. U. S. 144. 1903. 



Uralepis pilosa Buckl. Proc. Acad. Phila. 1862: 94. 1863. 



Sieylingia pilosa Nash in Britt. & Brown, lUustr. Fl. 3: 504. 1898. 



Type locality: "Middle Texas." 



Range: Kansas and Colorado to New Mexico and Texas. 



New Mexico: Farmington; Pecos; Knowles; Torrance; Buchanan; Las Vegas Hot 

 Springs; Cross L Ranch; Mangas Springs; Dayton; Gray; Guadalupe Mountains; 

 Roswell. Dry hills and plains, in the Upper Sonoran Zone. 



