HITCHCOCK—MEXICAN GRASSES. 857 
Type locality, ‘‘Texas,’”’ the type specimen collected by Nealley in 1892 at San 
Diego. 
RANGE: Florida to Texas and south to Nuevo Leén. 
HERBARIUM SPECIMEN FROM MEXICco: 
Nuevo Leon: Monterey, hills, Pringle 1972. 
4. Tridens texanus (Thurb.) Nash in Small, Fl. Southeast. U. 8. 142. 1903. 
Triodia tecana 8. Wats. Proc. Amer. Acad. 18: 180. 1883. 
Tricuspis tecana Thurb.; S. Wats. loc. cit. as synonym of Triodia texana. 
Type locality, ‘‘Western Texas.”’ 
RanaeE: Texas to San Luis Potosf. 
HERBARIUM SPECIMENS FROM MEXICO: 
CoaHuILa: Rio Grande Valley near Dfaz, Pringle 9019. Monclova, Palmer 1371 
in 1880. 
Nuevo Leon: Monterey, hills, Pringle 1970; edge of field, Hitchcock 5525. 
TamMAULrPas: Victoria, Palmer 372 in 1907. 
San Luis Porosi: Guascama Purpus 5422. Bagre, Purpus 5435. 
5. Tridens avenaceus (H. B. K.). 
Triodia avenacea H. B. K. Nov. Gen. & Sp. 1: 156. pl. 48. 1816. 
Type locality, ‘‘In convalle Mexicana inter montem Chapultepec et Penol de los 
Banos.” 
Rance: Texas to Arizona and south to South America. 
HERBARIUM SPECIMENS FROM MEXIco: 
CHIHUAHUA: Santa Eulalia Plains, Wilkinson 350. Santa Eulalia Mountains, 
Pringle 406. 
CoanuILa: Jaral, Schumann 1740. Saltillo, in tufts on rocky hillsides, Palmer 
262, 414, and 813 in 1898; Palmer 735 in 1905. Parras, Ross 1526. 
ZAcATEcAS: Concepcién del Oro, Palmer 265 and 280 in 1904. Hacienda de 
Cedros, foot slopes and hills, Lloyd 180, 232. Zacatecas, in gulch in dry 
sterile hills, Hitchcock 7512. 
AGUASCALIENTES: Aguascalientes, sterile, rocky hill, Hitchcock 7466. 
San Luis Portosf: Cardenas, dry limestone hills, Pringle 3930. San Luis 
Potos{, Griffiths 6514; Schaffner 159, 160. Las Candas, rocky hill, Hitchcock 
5767. Enroute from San Luis Potosi to San Antonio, Texas, Parry & Palmer 
950 in 1878. Bagre, Purpus 5427. 
QUERETARO: Querétaro, rocky hill, Hitchcock 5853. 
Hipatco: Ixmiquilpan, limestone hillside, Rose, Painter & Rose 8886, 8959. 
Pachuca, rocky hill, Hitchcock 6707. 
FEDERAL District: Hills, Pringle 9586; Schaffner 158. 
Puresia: Mount Orizaba, barren slopes, Seaton 248. San Luis Tultitlanapa, 
Purpus 3594. Esperanza, barren hills, Pittier 419; rocky hill, Hitchcock 6475. 
6. Tridens pilosus (Buckl.). 
Uralepis pilosa Buckl. Proc. Acad. Phila. 1862: 95. 1863. 
Triodia acuminata (Munro) Vasey, U. S. Dept. Agr. Div. Bot. Bull. 12?: pl. 82. 
1891. 
Type locality, ‘‘Middle Texas.’ 
Rance: Kansas to Nevada and south to San Luis Potosf. 
HERBARIUM SPECIMENS FROM MEXICO: 
CoaHuILa: Dfaz, calcareous soil, Pringle 8306. 
Nuevo Leon: Monterey, by irrigation ditch, Hitchcock 5536; Canby 271. 
San Luis Porosi: En route from San Luis Potosi to San Antonio, Texas, Parry 
948 in 1878. 
7. Tridens pulchellus (H. B. K.) Hitche. in Jepson, Fl. Calif. 1: 141. 1912. 
Triodia pulchella H. B. K. Nov. Gen. & Sp. 1: 155. pl. 47. 1816. 
