Muhlenbergia diversiglumis Trin.

Muhlenbergia diversiglumis Trin. Mem. Acad. vSt.-Petersb. 6-:
298 (reprint 52). 1841.
Muhlenbergia Trinii Foum.; Hemsl. Biol. Centr. Am. Bot. 3: 543. 1885; Mex. PI. Gram. 84. 1886. (Based on M. diversiglumis Trin.)
Annual; culms very slender, delicate, several-noded, branching at all the nodes, spreading, lax, 20-50 cm. long, the nodes pilose; sheaths sparsely to rather densely papillose-pilose, mostly shorter than the internodes; ligule less than 0.5 mm. long; blades flat, lax, pilose on both surfaces, usually 2-5 cm. long, 0.5-2 mm. wide; panicles numerous, terminal and axillary, narrow, loose, mostly 1-sided, the filiform axis flexuous, the capillary scabrous branches simple, spreading or reflexed, disarticulating just above the base with the appressed subsessile spikelets attached, the lower branches somewhat distant, bearing 2—5 spikelets, the upper approximate, with two spikelets; glumes 0.2-0.3 mm. long, broad, irregularly dentate, the first glume of the terminal spikelet usually bearing a scabrous awn, 1-7 mm. long; lemma at first subterete, expanding toward maturity, scabrous on the back, pilose at base, usually ciliate on the margin toward the summit, 3-5 mm. long, tapering into a slender scabrous awn 5-15 mm. long, the tip of the lemma sometimes with a pair of slender teeth at the base of the awn; palea narrow, scabrous, the nerves extending into slender awns.
Type locality: Porto Pedro. Mexico (Karwinsky) .
Distribution: Rocky or sterile soil, southern Mexico (Michoacan, Morelos, Jalisco).