Muhlenbergia robusta (E. Fourn.) Hitchc.

Muhlenbergia macrotis (Piper) Hitchcock
Epicampes macrotis Piper, Proc. Biol. Soc. Wash. 18: 144. 1905.
Perennial; culms stout, glabrous, about 1 m. tall, the lower sheaths crowded, compressedkeeled; sheaths keeled, glabrous; ligule short, with a firm prominent auricle 2-4 cm. long on each side from the summit of the sheath; blades elongate, flat, firm, scabrous on the upper surface, margins, and prominent keel, 4-6 mm. wide; panicle erect, pale, narrow, about 30 cm. long, the axis scaberulous, the branches ascending or appressed, 3-6 cm. long, the spikelets rather crowded on short appressed branchlets; glumes equal, broad, obtusish, glabrous, about 2.5 mm. long; lemma glabrous below, scaberulous above, acute, about 3 mm. long. Resembling M. robusta, differing in the narrower looser panicle, the lemmas longer than the glumes, glabrous below, and scaberulous above.
T^TE LOCAI.ITV: Sierra Madre. Zacatecas {Rose 3528). DisTRiBUTio.v: Known only from the type collection.

Muhlenbergia robusta (Fourn.) Hitchcock
Epicampes Berlandieri Fourn. Mex. PI. Gram. 89. 1886. (Type from State of Mexico. Berlandier 670.) Not Muhlenbergia Berlandieri Trin. 1841.
Epicampes robusla Fourn. Mex. PI. Gram. 89. 1886. (Basis of Muhlenbergia robusla Hitchc.)
?Epicampes Ehrenbergii Mez, Repert. Sp. Nov. 17: 212. 1921. (Type from Cuesta de Pinolco, Mexico.)
Muhlenbergia Fournieriana Hitchc. Jour. Wash. Acad. 23: 453. 1933. (Based on Epicampes Berlandieri Fourn.)
Perennial; culms robust, erect, glabrous or nearly so, 1-2 m. tall, with I or 2 nodes below the middle, the basal overlapping sheaths compressed-keeled; sheaths keeled, glabrous or the upper slightly scaberulous; ligule thin, 2-4 mm. long, sometimes longer on the innovations; blades elongate, firm, flat or usually folded, more or less involute, especially toward the longattenuate point, scabrous, especially on the margins, 2-5 mm. wide; panicle erect, ashy-gray or plumbeous, narrow, 30-60 cm. long, mostly 4-6 cm. wide, the axis angled, scabrous, the branches appressed or ascending, numerous, approximate, naked below, mostly 5-15 cm. long, the lateral pedicels very short; glumes about equal, thin, scaberulous or nearly smooth, acute or rather obtuse, 2.5-3 mm. long; lemma about as long as the glumes, glabrous except a few short hairs at base, acute, more or less mucronate, sometimes short-awned.
Type locality: Federal District, Mexico (Bourgeau 1J53). Distribution: Rocks and canyons. Puebla to Michoacan; Guatemala.

Muhlenbergia meziana Hitchcock
Epicampes minutiflora Mez. RciktI. Sj). Nov. 17: 212. 1921. (Basis oi Muhlenbergia Meziana Hitchc.) Not Muhlenbergia minuliflora Hitchc.
Perennial; culms rather robust, erect, glabrous, 1-2 m. high, the basal overlapping sheaths compressed-keeled; sheaths keeled, the lower glabrous, the upper scaberulous; ligule thin, lacerate, 1-2 cm. long, hidden in the folded base of the blade, the firm margins of the sheath extended upward into prominent auricles; blades elongate, folded at base, mostly flat above, involute-pointed, very scabrous on the margins, 1-5 mm. wide; panicle narrow, somewhat loose or condensed, pale or purplish, 30-60 cm. long, the axis angled, scaberulous, the branches slender, many-flowered, usually appressed, sometimes ascending, scaberulous, 5-10 cm. long, the lateral pedicels shorter than the spikelets; glumes nearly equal, acutish or obtuse, scaberulous, about 2 mm. long; lemma acute, usually slightly shorter than the glumes, faintly scabrous, 3-nerved, no hairs at base; palea as long as the lemma.
TvPB UKAi-irv: Bl Canizal, Michoacin (Langlasse).
Distribution: Canyons and rocky slopes, Sinaloa to Michoacin, Mexico (Pringle 2321, 2356,

Muhlenbergia presliana Hitchcock
Epicampes slricla Presl. Rel. Haenk. 1: 235. 1830. (Basis of Muhlenbergia Presliana Hitchc.) Not Muhlenberiiia slricta Kunth.
Perennial; culms moderately robust, glabrous, erect, 1-1.5 meters tall, the basal overlapping sheaths compressed-keeled; sheaths glabrous, keeled; ligule short, lacerate, mostly not more than 5 mm. long; blades elongate, folded at base, fiat or folded above, involute toward the attenuate tip, scabrous, 1-4 mm. wide; panicle narrow, erect, rather dense, pale or plumbeous, 25-50 cm. long, the axis angled, scabrous, the branches appressed at the naked base, less appressed above, rather densely flowered, 5-10 cm. long; glumes equal, rather broad, obtusish, scabrous, 2 mm. long; lemma oblong, acutish, about as long as the glumes, faintly scaberulous, not pilose at base, awnless, mucronate or with an awn as much as 2 mm. long. Most of our specimens are awnless or mucronate only.
Type locality: Mexico (Haenke).
Distribution: Sandy or rocky slopes, southern Mexico to Guatemala.

Muhlenbergia robusta là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (E.Fourn.) Hitchc. mô tả khoa học đầu tiên năm 1935.