HITCHCOCK—MEXICAN GRASSES. 301 
48. Muhlenbergia vaseyana Scribn. Rep. Mo. Bot. Gard. 10: 52. 1899. 
Type locality, ‘‘Rocky cafion, Arizona,” the type specimen collected by Roth- 
rock, Wheeler Exped. (no. 282). 
Rance: Texas to Arizona and south in the highlands to Oaxaca. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower CaLirornia: El Taste, Brandegee in 1893. San Francisquito Mountains, 
Brandegee in 1890 and 1899. Sierra de la Laguna, Brandegee in 1899. 
Sonora: San José Mountains, Mearns 962. Sierra de los Alamos, Palmer 409 in 
1890. 
Curauagua: Sanchez, rocky pine woods, Hitchcock 7669; rocky hill, Hitchcock 
7714. Santa Eulalia Hills, Wilkinson in 1885. Mifiaca, rocky hill, Hitchcock 
7742, 
Duranco: Durango, Iron Mountain, Palmer 542 in 1896; rocky hill, Hitchcock 
7621. Otinapa, Palmer 553 in 1906. 
Coanumna: Jaral, Schumann 1753 in 1885. 
MicHoacdn: Morelia, Arséne 2674. 
MExico: Ixtaccihuatl, rocks, barrancas, Purpus 1611. Salto de Agua, rocky 
hillsides, Purpus 1629. Federal District, Pedregal, Rose, Painter & Rose 
8255, 9456. 
Pursia: Cerro de Soluche, Purpus 4081. 
Oaxaca: Oaxaca, Smith 916. Reyes, Nelson 1780. Sierra de San Felipe, Smith 
927; summit ledges, Pringle 5577. Dolores, Liebmann 737. 
49. Muhlenbergia grandis Vasey, Contr. U. 8. Nat. Herb. 1: 283. 1893. 
Type locality, ‘‘Rio Blanco,” the type specimen collected in 1886 by Palmer (no. 
515). 
RaNncE: Known only from Jalisco. 
HERBARIUM SPECIMENS: 
Jauisco: Guadalajara, cool slopes of barranca, Pringle 1760, 2362. Rfo Blanco, 
Palmer 515, 515a, and 682 in 1886; slopes of barranca, Pringle 11751. 
50. Muhlenbergia virescens (H. B. K.) Kunth, Rév. Gram. 1: 64. 1829. 
Podosaemum virescens H. B. K. Nov. Gen. & Sp. 1: 132. 1816. 
Type locality, ‘‘locis asperis, excelsis regni Mexicani prope Santa Rosa de la Sierra 
et Puerto de Varientos.”’ 
Rance: New Mexico and Arizona to central Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
ZACATECAS: Sierra Madre, Rose 3527. 
San Luis Porost: San Luis Potosi, Parry & Palmer 920 and 928 in 1878. 
51. Muhlenbergia articulata Scribn. Proc. Acad. Phila. 1891: 298. f. 1. 1892. 
Type locality, ‘‘Calcareous banks, Cardenas, State of San Luis Potosf,” the type 
specimen collected by Pringle (no. 3477). 
RANGE: Known only from type locality. 
HERBARIUM SPECIMEN: 
San Luis Porosf: Cérdenas, dry calcareous hills, Pringle 3913. 
52. Muhlenbergia longiglumis Vasey, Contr. U.S. Nat. Herb. 1: 283. 1893. 
Type locality, ‘‘Guadalajara,’’ the type specimen collected by Palmer (no. 766). 
RanGE: Pacific slope of southwestern Mexico. 
HERBARIUM SPECIMENS: 
JaLisco: Guadalajara, rocky hills, Pringle 11752; hillsides under pines, Pringle 
2365; Palmer 766 in 1886. 
MicHuoacdn: Morelia, Arséne in 1909. 
