Calamagrostis tolucensis (Kunth) Trin. ex Steud.

Calamagrostis tolucensis (H.B.K.) Trin.; Steud. Nom. Bot ed. 2. 1: 251. 1840.
Deyeuxia tolucensis H.B.K. Nov. Gen. & Sp. 1: 143. 1815.
Deyeuxia junciformis H.B.K. Nov. Gen. & Sp. 1: 143. 1815. (Type from Toluca, Mexico.)
Calamagrostis cuspidata Spreng. Syst. 1: 253. 1825. (Type from Mexico.)
Calamagrostis junciformis Steud. Nom. Bot. ed. 2. 1: 250. 1840. (Based on Deyeuxia junciformis
H.B.K.) Calamagrostis sesquitriflora Steud. Syn. Gram. 190. 1854. (Type from Toluca, Mexico. Steudel's
description of the spikelet is erroneous; the type has been examined and found to have a single
floret with awned lemma; the large spreading palea is obviously the "awnless floret" referred
to by Steudel.)
Culms densely cespitose, erect, glabrous, 20-40 cm. tall; sheaths smooth, shiny; ligule truncate, about 1 mm. long; blades firm, erect, involute, sharp-pointed, glabrous or scabrous on the outer surface, villous on the inner surface, 20-30 cm. long, 1—1.5 mm. thick; panicle pyramidal, loose, open, pale, 10-15 cm. long, the slender branches spreading, glabrous, naked below, few-flowered above, as much as 6 cm. long; glumes lanceolate-attenuate, rather wide, glabrous except the keel, slightly scabrous toward the tip, about 6 mm. long; lemma about as long as the glumes, puberulent toward the tip, the awn attached about the middle, geniculate, twisted and hispidulous below, the terminal segment horizontal, about 5 mm. long; callus-hairs about one third as long as the lemma; rachilla 1.5 mm. long, the hairs 1-2 mm. long.
Type locality: Near Toluca, Mexico. Distribution: Paramos, Mexico and Guatemala.