HITCHCOCK—MEXICAN GRASSES. 325 
HERBARIUM SPECIMENS FROM MEXICO: 
CHIHUAHUA: Southwestern Chihuahua, Palmer 14 in 1885. Mapula Mountains, 
wet banks of streams, Pringle 821. Canyons of the Sierra Madre, springy 
banks, Pringle 1432. SAnchez, rocky pine woods near bed of stream, Hitch- 
cock 7676. 
Jauisco: Guadalajara, Palmer 210 in 1886. San Pedro, along ditch, Hitchcock 
7296; praric, Hitchcock 7302. 
Micnoackn: Urudpan, along road, Hitchcock 6964. Morelia, Arséne 2921. 
Miixico: Toluca, rocky hill, Hitchcock 6902; along ditch, Hitchcock 6920. Popo 
Park, moist soil, Hitchcock 5966. Federal District, edge of field near ditch, 
Hitchcock 5914; wet meadows, Pringle 8512. 
Pursia: Chinantla, Liebmann 733, 735; Chalchicomula, rocky hill, Hitchcock 
6285. Cholula, Nicolas in 1911. 
Veracruz: Orizaba, roadside ditch, Hitchcock 6331. 
Oaxaca: West slope of Zempoaltepec, Nelson 554. 
5. Trisetum evolutum (Fourn.). 
Deyeuxia evoluta Fourn, Bull. Soc. Bot. France 24: 181. 1877. 
Type locality not given in the original publication, Mirador and Orizaba cited in 
Mexicanas Plantas. 
Rance: Highlands of central and southern Mexico. 
HERBARIUM SPECIMENS: 
San Luts Porosi: Las Candas, clay bank, Hitchcock 5755. 
MicHoacdn: Pdtzcuaro, dry hills, Pringle 3950. 
México: Salto de Agua, dry places, Purpus 1632. 
> Veracruz: Jalapa, along ditch, Hitchcock 6596. Orizaba, open rocky hill, 
Hitchcock 6351. Mirador, Liebmann 730. 
Guerrero: Between Avusinapa and Petatlin, Nelson 2123. 
6. Trisetum palmeri sp. nov. . 
Culms cespitose, slender, glabrous, 60 to 100 cm. high; sheaths glabrous or somewhat 
scabrous; ligule 3 to 4 mm, long; blades elongated, nearly or quite equaling the panicle, 
1 to 3mm. wide, soon involute, scabrous; panicle loose, narrow, 10 to 20 cm. long, the 
branches several in rather distant whorls, ascending, the shorter ones spikelet-bearing 
nearly to the base, the longer 5 cm. long, naked below; spikelets, excluding the awns, 
5 to 6 mm. long, 2-flowered, the rachilla prolonged as a plumose bristle; glumes about 
4mm. long, narrow, tapering to an acute apex, green along the midnerve, the margins 
scarious, glabrous except the scabrous keel, the first 1-nerved, the second 3-nerved; 
lemmas about 4 mm. long, rounded on the back, 5-nerved, scabrous, scarious-tipped, 
the apex erose, obtuse, 2-lobed, the awn ef each Jemma geniculate, 5 to 6 mm. long, 
exserted, attached about the middle; palea slightly exceeding the lemma; callus and 
rachilla joints pilose with short hairs, the prolongation of the rachilla about one-third 
as long as the upper floret. 
As the genera Trisetum and Deschampsia are usually distinguished, this species 
would be referred to the latter; as it has 2-flowered spikelets with obtusely 2-lobed 
lemmas rounded on the back; but the narrow lemmas exceeding the glumes appear 
to ally it more closely to certain species of Trisetum. 
Type in the U. S. National Herbarium, no. 571365, collected at Otinapa, Durango, 
July 25 to August 5, 1906, by Palmer (no. 342). 
Rance: Known only from Durango. 
HERBARIUM SPECIMENS: 
Duranco: San Ramén, Palmer 128in 1906. Otinapa, Palmer 342 and 350 in 1906. 
7. Trisetum viride (H. B. K.) Kunth, Rév. Gram. 1: 101. 1829. 
Avena viridis H. B. K. Nov. Gen. & Sp. 1: 147. 1816. 
Type locality, ‘‘in alta planitie Mexicana, inter Salamanca et Queretaro.”’ 
