HITCHCOCK—MEXICAN GRASSES. 285 
15. Stipa ichu (Ruiz & Pav.) Kunth, Rév. Gram. 1: 60. 1829. 
Jarava ichu Ruiz & Pav. Fl. Peruv. Chil. Prodr. 2. pl. 1. 1794. 
Stipa liebmanni Fourn. Mex. Pl. 2: 76. 1886. (‘‘Cerro Leon pr. Perote,’’ Veracruz, 
(Liebmann 667), a depauperate specimen differing from S. ichu in being about 15 
cm. high and in having slender involute blades). 
Type locality, mountains of Peru. 
RanGE: Highlands of Mexico, south in the mountains to Patagonia. 
HERBARIUM SPECIMENS FROM MExIco: 
San Luis Potosi: San Luis Potosf, Schaffner 174; Parry & Palmer 967 in 1878. 
México: Sierra de las Cruces, cool ledges, Pringle 4281. Ixtaccihuatl, Purpus 
323; dry mountain slopes, Purpus 1610. Popocatepetl, open woods, Purpus 
1609. Montezuma, Bourgeau 1156. Cima, Orcutt 3788. 
PuEBLA: Esperanza, along railway, Hitchcock 6498, 6502; dry open ground, 
Hitchcock 6467; barren hills, Pittier 423. Chalchicomula, ravine, Hitchcock 
6275; hills, Pringle 9566. San Marcos, railway embankment, Hitchcock 6521. 
Manzanilla, Nicolas in 1909. 
Veracruz: Cerro Leén, Liebmann 667. 
Oaxaca: Chinantla, Liebmann 669. Sierra de Clavellinas, open slopes, Pringle 
4998. 
16. Stipa tenuisissima Trin. Mém. Acad. St. Pétersb. VI. Sci. Nat. 2': 36. 1836. 
Type locality, Chile, the type specimen collected at Mendoza by Gillies, and sent 
to Trinius by Hooker in 1835. 
RancGE: Southwestern United States to Chile. 
HERBARIUM SPECIMENS FROM MExXIco: 
Coanuria: Saltillo, Nil in 1909; Nicolas in 1909; Palmer 3414 and 455 in 1904. 
Carneros Pass, Pringle 3274. 
PursBLa: San Marcos, railway embankment, Hitchcock 6518, 6519, 6540. Espe- 
ranza, dry open ground, Hitchcock 6464; along railway, Hitchcock 6499. 
61. ORYZOPSIS Michx. Fl. Bor. Amer. 1: 51. pl. 9. 1803. 
KEY TO THE SPECIES. 
Glumes pubescent; fruit globular-fusiform, densely clothed with 
a soft white brush-like pubescence ........-.-..-.-...-... 1. O. hymenoides. 
Glumes glabrous. 
Fruit dark, brown-pubescent, acute at both ends............ 2. O. fimbriata. 
Fruit pale, white-Pubescent, the apex blunt, the base sub- 
acute. we ee ee eee ee ee ee ee ee ce ee cece ee eee . 3. O. florulenta. 
1. Oryzopsis hymenoides (Room. & Schult, Ricker; Piper, Contr. U. S. Nat. 
Herb. 11: 109. 1906. 
Stipa hymenoides Roem. & Schult. Syst. Veg. 2: 339. 1817. 
Eriocoma cuspidata Nutt. Gen. Pl. 1: 40. 1818. 
Type locality, “On the banks of the Missouri,’’ the type specimen collected by 
Bradbury. 
RanGE: Manitoba to Washington, south to northern Mexico. 
HERBARIUM SPECIMENS FROM MEXICO: , 
Lower CaLiForniA: Cantillas Mountains, Orcutt 1147. 
CuiHuaHua: Sand hills near Paso del Norte, Pringle 1053. 
2. Oryzopsis fimbriata (H. B. K.) Hemsl. Biol. Centr. Amer. Bot. 3: 538. 1885. 
Stipa fimbriata H. B. K. Nov. Gen. & Sp. 1: 126. 1816. 
Type locality, ‘‘in alta planitie Mexicana inter Burras et Guanaxuato,’’ a second 
locality, ‘‘Mina de Villalpando, ” also cited. 
RancE: Mountain regions of Mexico, 
