70 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
4. Muhlenbergia gracillima Torr. U. 8. Rep. Expl. Miss. Pacif. 4: 155. 1856. 
RING GRASS. 
Typr tocauiry: “Llano Estacado, and near the Antelope hills of the Canadian 
River,”’ Texas or New Mexico. Type collected by Bigelow. 
Rance: Colorado and Kansas to Texas and New Mexico. 
New Mexico: Sierra Grande; Nara Visa; El Rito Draw; Las Vegas; Albuquerque; 
Pecos; Roy; Clayton; Socorro; Santa Fe; Llano Estacado; Mangas Springs; Buchanan; 
Deming; Dona Ana; Guadalupe Mountains; Fort Stanton; Gray. Plains and low hills, 
in the Upper Sonoran Zone. 
This is very common on the plains of the northern part of the State. Its habit of 
growth is peculiar: the plants are low and form dense circular mats; after a time the 
center of the mat dies and a sort of “ fairy ring” is left. 
5. Muhlenbergia arenicola Buck]. Proc. Acad. Phila. 1862: 91. 1863, 
Type Locauity: ‘‘Arid places in Western Texas.” 
Rance: Western Texas and southern New Mexico. . 
New Mexico: Deming; Redlands; Hope; Lake Arthur; Rio San Jose; near Suwanee; 
Gila Hot Springs; Arroyo Ranch; Jornada del Muerto. Dry hills, in the Lower and 
Upper Sonoran zones. 
6. Muhlenbergia rigida (H. B. K.) Kunth, Rév. Gram. 1: 63. 1829. 
Podosaemum rigidum H. B. K. Noy. Gen. & Sp. 1: 129. 1816. 
Tyre Locauity: Near Guanajuato, Mexico. 
RanaeE: New Mexico and Arizona to Mexico. 
New Mexico: Five miles east of San Lorenzo on Mimbres River (Metcalfe 1447). 
7. Muhlenbergia schaffneri Fourn. Mex. Pl. 2: 85. 1881. 
Type Locauiry: “ Prope Tacubaya,’’ Mexico. 
RanaGe: New Mexico and Arizona to Mexico. 
New Mexico: Trujillo Creek; Mogollon Creek; Organ Mountains. Dry slopes, in 
the Upper Sonoran Zone. 
8. Muhlenbergia mexicana (L.) Trin. Gram. Unifl. 189, 1824. 
Agrostis mexicana L. Mant, Pl. 1: 31. 1767. 
Type Loca.ity: ‘“ Habitat in America calidiore.’’ 
Rance: British America to Tennessee and New Mexico; also in Mexico. 
New Mexico: West Fork of the Gila; Winsors Ranch. Damp ground, in the 
Transition Zone. 
9. Muhlenbergia racemosa (Michx.) B. 8. P. Prel. Cat. N. Y. 67. 1888. 
Agrostis racemosa Michx. F1, Bor, Amer. 1: 53. 1803, 
Polypogon glomeratus Willd. Enum. Pl. 87. 1809. 
Muhlenbergia glomerata Trin. Gram. Unifl. 191. 1824, 
Type Locauity: “ Habitat in ripis sabulosis inundatis fluminis Mississippi.” 
Range: British America to New Mexico, Missouri, and New Jersey. 
New Mexico: Cedar Hill; Dulce; Las Vegas; Pecos; Raton Mountains; Sandia 
Mountains; Mangas Springs; Animas Creek; Mesilla Valley; Little Creek; Gilmores 
Ranch. Damp woods, Lower Sonoran to Transition Zone. 
10. Muhlenbergia comata (Thurb.) Benth. Journ. Linn. Soc. Bot. 19: 83. 1881. 
Vaseya comata Thurb. Proc. Acad. Phila. 1863: 79. 1863. 
Tyre Locauity: “Plains of Nebraska.’’ 
Rana@eE: California to Colorado and New Mexico. 
New Mexico: Winsors Ranch (Standley 4359). Open slopes, in the Transition 
Zone. 
