HITCHCOCK—MEXICAN GRASSES. 295 
16. Muhlenbergia schreberi Gmel. Syst. Nat. 2: 171. 1791. 
Muhlenbergia diffusa Willd. Sp. Pl. 1: 320. 1805. 
Type locality not given. 
Rance: Northern United States to southeastern Mexico. 
HERBARIUM SPECIMENS FROM MEXICco: 
Veracruz: Jalapa, bank of railway cut through jungle, Hitchcock 6648; along 
railway near Coatepec, Hitchcock 6663. Orizaba, Bottert. 
17. Muhlenbergia lemmoni Scribn. in Coulter, Contr. U. 8. Nat. Herb. 1: 56. 1890. 
Type locality, ‘‘Arizona,’’ Huachuca Mountains, according to data on the type 
specimen collected by Lemmon (no. 2918). 
Rance: Southwestern United States and south in the highlands to southern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Curmuanua: Sdnchez, cleft of bowlder in rocky ravine, Hitchcock 7685. Chi- 
huahua, cool wet ledges, rocky hills, Pringle 394, 395. 
Durango: Durango, rocky hill, Iron Mountain, Hitchcock 7635, 76354. Sand{as 
Station, barranca, Pringle 13632. 
San Luis Potosi: San Luis Potos{, Schaffner 144, 189. Villar, limestone ledges, 
Pringle 4539. Bagre, Purpus 5426. 
Guanasuato: Acémbaro, under cliffs, Pringle 13247. 
Feperau District: Wet ledges of ravines, Pringle 8263. 
18. Muhlenbergia squarrosa (Trin.) Rydb. Bull. Torrey Club 36: 531. 1909. 
Vilfa squarrosa Trin. Mém. Acad. St. Pétersb. VI. Sci. Nat. 3': 100. 1840. 
Type locality, ‘‘America septentr[ionalis] in Ins. Menzies,” the specimen sent to 
Trinius by Hooker. 
Rance: Montana to Washington and south in the mountains to southern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower CALIFORNIA: Sierra de la Laguna, Brandegee in 1899. 
Sonora: San Pedro River, Mexican boundary line, Mearns 1128. 
Cumuanua: Sanchez, bottom of rocky ravine, Hitchcock 7710. Chihuahua, by 
streams, Pringle 418. 
Durango: Durango, along dike of pond, Hitchcock 7653; in stiff, alkaline soil, 
Palmer 738 and 739 in 1896. 
CoaHuma: Jaral, Schumann 1750. Saltillo, open dry ground, Hitchcock 5613; in 
close tangled mat, dry ground near ditch, Hitchcock 5652; dry field, Ross 1493. 
Zacatecas: Zacatecas, gulch, dry sterile hill, Hitchcock 7497. 
San Luts Potosi: San Luis Potosf, edge of field, Hitchcock 5688, 5701; Schaffner 
163. 
Hiparco: Pachuca, rocky hill, Hitchcock 6736; sandy river bed, Hitchcock 6756. 
Mixtco: Toluca, along roadside bank, the runners hanging down the bank, 
Hitchcock 6919. Federal District, open ground along railway, Hitchcock 5928. 
Puesia: Chalchicomula, dry ground along track, Hitchcock 6268. San Marcos, 
along railway embankment, Hitchcock 6507. Esperanza, along railway, 
Hitchcock 6501. 
19. Muhlenbergia breviseta Griseb.; Fourn. Mex. Pl. 2: 83. 1886. 
Type locality, ‘‘Orizaba,”’ the following specimens from this place cited: Miller 
1453, 2003, 2093, Schaffner 111 in herb. Franqueville, 157 in ‘‘pl. ed. Hohen.”’ 
RanaeE: Highlands of southern Mexico. 
HERBARIUM SPECIMENS: 
Veracruz: Orizaba, Miller 1453, Bottert. 
Jauisco: Zapotl4n, pine woods, Hitchcock 7249. 
MicHoacdn: Pf&tzcuaro, dry cool soil, hills, Pringle 3944. Urudpan, dry fields, 
Pringle 13900; sandy fields, Pringle 10370. 
