66 
leaves long, nearly equaling the culm, erect, narrow, and becoming involute; panicle 
1 to 2 feet long, open and spreading, the branches capillary, 6 to 10 inches long, dis- 
tantly subdivided, pedicels 4 to 14 inches long; empty glumes one-fourth to one-half 
as long as flowering glumes, obtusish or acute, with or without an awned point; 
flowering glume about 2 lines long, narrow, with an awn two to four times as long as 
itself.—New England to Missouri, south to Florida and Texas. 
Var. FILIPES Chapm. (Muhlenbergia filipes). Curtis; both glumes long-awned ; 
flowers light-colored.—F lorida. 
Var. TRICHOPEDES (Agrostis trichopodes Ell.; Muhlenbergia trichopodes Ell.; Muh- 
lenbergia expansa Trin.), empty glumes not awn-pointed, awn of flowering glume short. 
2. M. affinis Trin. Agrost. 11. p. 55. Culms simple, very slender, naked above the 
middle; sheaths longer than the internodes, scabrous downward; ligule 2 to 24 lines 
long; leaves linear, compressed, 5 inches long, pale glaucous; panicle 8 inches long, 
spreading, shining, branches solitary, or in threes or fives, capillary, lower ones 
about 3 inches long, naked below for 6 to 9 lines, above open-branched, pedicels 
sometimes shorter, sometimes 2 or 3 times longer than the spikelets, the latter 2 lines 
long; empty glumes one-third as long as the flowering glume, the latter glabrous, 
with a short, hairy callus and an awn 4 to 5 lines long. 
This is Trinius’s description, and seems to answer to specimens from Texas, col- 
jected by G. C. Nealley. We have the same also from Arizona (J. D. Emersley ). 
3. M. Reverchoni Vasey & Scribn. Culms 1} to 2 feet high, slender, erect, upper 
half naked; radical leaves 3 to 5 inches long, flat, involute toward the apex, scabrous 
on the upper surface, ligule 1 to 2 lines long, cauline leaves about two; panicle pyra- 
midal, 5 to 8 inches long, thinly flowered, the lower branches about 3 inches long, © 
mostly solitary, subdivided nearly to the base, capillary, pedicels as long as, or 2 to 
3 lines longer than the spikelets; empty glumes one-third or one-half as long as 
flowering glume, acute; flowering glumes 23 lines long, the awn rather shorter. Dis- 
tinguished by the short, flat leaves. —Texas (Mr. J. Reverchon). 
4. M. distichophylla Kth. Enum. Plant, 1. p. 202. Perennial, culms firm, 3 
to 34 feet long, including panicle, leafy; leaves distichous, the lower two-thirds 
- as long as the culm; condupulicate, rigid, scabrous, sheaths compressed, smooth, 
ligule 5 or 6 lines long, acute; panicle contracted, 6 to 15 inches long, rather 
dense, about an inch wide, branches scattered or verticillate, erect, 1 to 3 inches 
long, about the lower third naked, above with short, erect subdivisions; spike- 
lets 14 lines long; empty glumes as long as the flowering glumes, or slightly longer 
or shorter, linear-oblong, thin, obtuse; flowering glume slender, smooth or nearly so, 
awn 3 to 6 lines long, or absent.—Western Texas to Arizona (?). 
The awnless form has shorter empty glumes. The awned one has the long glumes 
of an Epicampes. There is some doubt whether our plant is the one described by 
Kunth. 
0, M. Bmersleyi Vasey n.sp. Culms 3 to 5 feet high, stout; leaves long, scabrous, 
1 to 2 feet long, rigid, 1 to 2 lines wide; sheaths scabrous, ligule 4 to 5 lines long, 
lacerate; panicle ample, 1 foot long, loose, purplish, branches scattered, the lower ones 
verticillate, 4 to 5 inches long, naked near the base, pedicels mostly shorter than the 
flowers ; empty glumes about 1} lines long, one-fifth longer than the flowering glumes; 
acutish, thin, 1-nerved, not keeled; flowering glumes 1 to 1} lines long, silky pubes- 
cent, especially on the margins below, 3-nerved, the middle nerveexcurrent near the 
apex in a slender awn 6 to 8 lines long; palet equaling its glume, pubescent oun its 
back between the two nerves.—Southern Arizona (J. D. Emersley). 
This has a heaver, looser panicle than M. distichophylla. 
6. M. setifolia Vasey. Bot. Gaz. v1. p. 296. Culms czspitose, 1 to 2} feet high, 
smooth, radical tufts fascicled, sometimes 1 foot long, involute-filiform, awl-pointed, 
scabrous on the margins, culm leaves similar, gradually sborter, the upper usually 
sheathing the base of the panicle; panicle narrow,6 to 8 inches long, linear and 
little subdivided, panicle appressed, shorter than to twice as long as the spike- 
lets; spikelets 2 lines long,empty glumes one-third as long and erose, obtuse, thin, 
