67 
about equal, the upper sometimes with a short, setaceous point; flowering glume 
smooth, with an awn 8 to 9 lines long, palet one-fourth shorter than its glume. The 
specimens described above are No, 221, of G. C. Nealley. 
This description includes the small form collected by Dr. Havard in the Guadalupe 
Mountains in 1881, which is smaller,and with short-curved leaves. It is near what 
I supposed to be M. Berlandieri Trin., of which we have no authentic specimens. 
7. M. Berlandieri Trin. Agrost. p. 53. Culms erect, about 3 feet, smooth, simple; 
sheaths much longer than internodes, scabrous, ligule 2 to 3 lines long, leaves 
linear, firm, lower ones 6 inches long, plain or convolute, pale glaucous; panicle 
lanceolate, 10 inches Jong, shining; common axis scabrous downwards, branches 
single or in twos or threes, scattered, rongh,soon subdivided above the base; pedi- 
cels short or twice as long as spikelet; spikelet about two lines long, linear-lanceolate 
very narrow; empty glumes subequal, one-sixth as long as the flowering glume 
3-nerved, very rough, hairs of the callus a little shorter than the glumes; awn about 
6 lines long.—Texas. No. 1992, C. Wright, has been re ferred to this species. 
8. M. acuminata Vasey. Bot. Gaz. xI. p. 337. Culms 3 to 4 feet high, slender, 
smooth; radical leaves involute, 6 to 12 inches long, cauline ones 3 or 4, distant, nar- 
row, becoming: invulute, acuminate, scabrous, the lower 6 to 8 inches long, the upper 
1 to 2 inches, ligule 8 to 4 lines long, lacerate ; panicle linear, 6 to 10 inches long, inter- 
rupted, the branches sessile, verticillate, or in twos or threes, closely appressed, the 
lower 1 to 2 inches long, flowering to the base; pedicels and rachis scabrous, spike- 
lets 2 lines long; empty glumes half as long, nearly equal, obtuse and denticulate 
at apex, mem>ranaceous; flowering glume 2 lines long, rigid, 3-nerved, acuminate, 
and terminating in a minute awn, about a line long; palet as long as its glume, 
acute.—New Mexico (No. 1993, C. Wright.) 
9. M. virescens Trin. Agrost., p. 57. Perennial; culms 1 to 2 feet high, sim- 
ple, erect, rather rigid, without nodes except atthe base ; leaves at base 6 to 10 inches 
long, flat, scabrous on the margins, or some of them involute setaceous ; sheaths very 
long, ligule narrow, 4 lines long, acute ; panicle 5 to 8 inches long, contracted, not 
dense, erect or drooping, somewhat one-sided, branches single (in twos or threes, 
Trin.), erect, flowering to the base, 1 to 2 inches long, pedicels very short; spikelets 
about two lines long; empty glumes lanceolate, acute, the lower one-fourth shorter 
than upper and 1l-nerved; upper as long as or a little exceeding the flowering glume 
and 3-nerved; flowering glume sparsely soft-pubescent below, awn flexuous, 5 to 8 
lines long; callus short-pubescent ; palet about equaling its glume.—New Mexico, 
Arizona and Mexico. 
The culms are without nodes, except at the growing-point of the rhizoma, 
10. M. gracilis Trin. Agrost. 1. p. 56. Perennial; culms 1 to 2 feet high, slen- 
der, the nodes crowded at the base, scabrous; covered at the base with dry, open 
sheaths; leaves convolute, rigid, 4 to 6 inches long; panicle 3 to 6 inches long, flexu- 
ous, linear, narrow ; branches single or in twos below, 1 to 2 inches long, flowering at 
the base; pedicels scabrous, very short; spikelets 14 to 2 lines long; empty glumes 
unequal, the lower about one-half as long as the flowering glume, 1l-nerved, acute or 
erose; upper glume one-third shorter than the flowering glume, 3-nerved, acute or 
3-toothed, with the teeth short-awned ; flowering glume, 3-nerved, pubescent or 
scabrous on the back, ciliate on the margins; awn 4 to 8 lines long; palet equaling 
its glume.—Texas, New Mexico, California and northward to British America, 
Var, BREVIARISTATA (Muhlenbergia subalpina Vasey) much reduced, 7 to 12 inches 
high; panicle about 2 inches long; awn 1 to 2 lines long.—At high altitudes, Colo- 
rado and Wyoming. 
11. M.arenicola Buckl. Proc. Acad. Phil. 1862. Culms 1} to 2 feet high ; leaves 
mostly short, 4 to 6 inches, linear, erect, attenuated toa fine point, foided; panicle 
6 to 8 inches long, open, spreading, branches singly and in twos or threes, the lower 
3 inches long, sparsely flowered, the lower fourth naked; pedicels one to three times 
as long as the spikelet ; spikelets about 2 lines long, empty glumes half as long, ob- 
tuse or obtusely tridentate, awn of floral glume scarcely 1 line long.—F rom western 
Texas to Arizona. This has been considered by some a variety of the next species. 
