322 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
HERBARIUM SPECIMENS FROM MEXICO: 
* Jatisco: Nevado de Colima, hillside, Hitchcock 7160; large bunches in partially 
open ground, hillside, Hitchcock 7162, 7163, 7164; above timber line, Hitch- 
cock 7168. Volcano of Colima, Jones 478. 
Muxico: Popocatepetl, Hitchcock 5982}; open hillsides about snow line, Hitch- 
cock 6000; Rose & Hay 5981, 6298, 6298a; Purpus 3769; Ross 1418. Ixtac- 
cihuatl, above timber line, Purpus 3769. Nevado de Toluca, Pringle 4248, 
Ross 504. 
Pursia: Mount Orizaba, open woods, [Hitchcock 6265, Liebmann 722. 
OAXACA: Sierra de San Felipe, under pines of summit ridges, Pringle 4726. 
This species includes several rather diverse forms which I have been unable to 
separate satisfactorily. The size of the spikelets and the length of the awn and of 
the pedicel are variable. 
75. DESCHAMPSIA Beauv. Ess. Agrost. 91. pl. &. f. 3. 1812. 
KEY TO THE SPECIES. 
Plants annual.......-.--- Dec ceeeecweee ec cce eter neeeeeees 1. D. danthonioides. 
Plants perennial. 
Panicle spike-like; awn geniculate, twisted below.......-. 2. D. pringlei. 
Panicle open; awn straight, not twisted. 
Lemma 2 mm. long; branches of panicle remote, slen- 
der, appressed..............--------+-+--++-+-- 3. D. elongata. 
Lemma 3 to 4 mm. long; branches of panicle short, the 
lower spreading. 
Glumes 5 mm. long; basal blades fine and lax, acute 
but not pungent. .............------------ 4, D. ebmanniana, 
Glumes 7 mm. long; basal blades spongy, pungent- 
pointed, rather stiff. ...............--.-.-- 5. D. straminea. 
1. Deschampsia danthonioides (Trin.) Munro; Benth. Pl. Hartw. 342, 1857. 
Aira danthonioides "Trin. Mém. Acad. St. Pétersb. VI. Math. Phys. Nat. 1: 57. 
January, 1830. 
Deschampsia calycina Presl, Rel. Haenk. 1: 251. 1830. 
Type locality, western North America. 
Rance: Alaska to Lower California. 
HERBARIUM SPECIMENS FROM MEXICO: 
Lower Carirornia: Palm Valley, Oreutt 1272. Tia Juana, mesas, Oreutt in 
1885. Guadelupe Ranch, Orecwtt in 1886. 
2. Deschampsia pringlei Scribn. Proc. Acad. Phila. 1891: 300. pl. 13. f. 1, 1a, 1892. 
Type locality, ‘‘wet places, pine plains, at the base of the Sierra Madre in the State 
of Chihuahua,” the type specimen collected by Pringle (no, 1429). 
RanGeE: Highlands from Chihuahua to Puebla. 
ILERBARIUM SPECIMENS: 
Curmmuanva: Mifiaca, dry run, Hitchcock 7762. Base of Sierra Madre, wet places, 
pine plains, Pringle 1429. . 
Duranoo: Durango, along creek, Hitchcock 7617. 
San Luis Porosi: San Luis Potosf, irrigation ditch, Hitchcock 5685. 
Hrpauco: Pachuca, rocky hill, Hitchcock 6730, 6737. 
Mexico: Toluca, rocky hill, Hitchcock 6889. 
Pursia: Chalchicomula, rocky hill, Hitchcock 6279. San Marcos, railway em- 
bankment, Hitchcock 6522. Esperanza, rocky hill, Hitchcock 6476. 
