298 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
31. Muhlenbergia quadridentata (H. B. K.) Kunth, Rév. Gram. 1: 64. 1829. 
Podosaemum quadridentatum H, B. K. Nov. Gen. & Sp. 1:130, 1816. 
Type locality, ‘‘in siccis apricis regni Mexicani prope Toluca, Puente de Tepare et 
Playas de Jorullo.”’ 
Rance: High mountains of southern Mexico. 
HERBARIUM SPECIMENS: 
Jaisco: Nevado de Colima, steep hillside, Hitchcock 7159, 7161. 
México: Popocatepetl, steep hillside in open woods, Hitchcock 5981; Rose & Hay 
6261. 
32. Muhlenbergia arenicola Buckl. Proc. Acad. Phila. 1862: 91. 1863. 
Type locality, ‘‘ Arid places in Western Texas.”’ 
Rance: Texas to Arizona and Chihuahua. 
HERBARIUM SPECIMEN FROM MEXxIco: 
CurnuaHuA: Chihuahua, plains, Pringle 479. 
33. Muhlenbergia wrightii Vasey in Coulter, Man. Rocky Mount. 409. 1885. 
Type locality, New Mexico, the type specimen collected by Wright. 
RanaeE: Colorado and southward in the mountains to southern Chihuahua. 
HERBARIUM SPECIMENS FROM MEXIco: 
Curmuanua: SAnchez, along railway, Hitchcock 76934. Base of Sierra Madre, wet 
places, pine plains, Pringle 1419; meadow, Townsend & Barber 331. 
34. Muhlenbergia firma Beal, Grasses N. Amer. 2: 243. 1896. 
Type locality, ‘‘Mexico (Oaxaca),”’ the type specimen collected by Pringle (no. 
4914), 
RanaeE: Highlands of southern Mexico. - 
HERBARIUM SPECIMENS: 
Hipatao: Pachuca, rocky hill, Hitchcock 6750, 6753. 
México: Federal District, lava beds, Pringle 6675, 13631. 
Pursia: Esperanza, rocky hill, Hitchcock 6479, 6531. Chalchicomula, large 
bunches, rocky hill, Hitchcock 6276, 6297, 6298. San Marcos, railway embank- 
ment, Hitchcock 6529. 
Oaxaca: Sierra de San Felipe, Smith 230; summit ledges, Pringle 4914. 
35. Muhlenbergia laxiflora Scribn. Zoe 4:389. 1894. 
Type locality, “‘La Chuparosa,’’ Lower California, the type specimen collected by 
Brandegee in 1893 (no. 74). 
Rance: Pacific slope of Mexico. 
HERBARIUM SPECIMENS: 
Curauanva: Sierra Madre, cool slopes, Pringle 1412. Mount Mohimora, Nelson 
4902, 4903. Sdnchez, rocky pine woods, Hitchcock 9221. 
Duranco: Southern Durango, Rose 2356. 
Oaxaca: Sierra de San Felipe, Conzatti & Gonzdlez 438. 
36. Muhlenbergia scabra 8. Wats. Proc. Amer. Acad. 18: 174. 1883. 
Type locality, ‘‘San Luis Potosi,” the type specimen collected by Schaffner (no, 
1067). 
RancGE: Known only from the type locality. 
HERBARIUM SPECIMEN: 
San Luis Portost: San Luis Potosi, Schaffner 179 in 1877. 
37. Muhlenbergia flaviseta Scribn. U. 8S. Dept. Agr. Div. Agrost. Bull. 8: 11. 
pl. 7. 1897. : 
Type locality, ‘‘Mexico,”’ the type specimen collected on sloping sides of an arroyo, 
in the region of pines and oaks, 8,500 feet alt., Dos Cajetes, Durango, in 1896 by Pal- 
mer (no. 834). 
Rance: Known only from the type collection. 
