70 
acuminate, ciliate on the margins, translucent; flowering glume thin, 3-nerved, 
bidentate, three-fourths line long, with an awn about as long as itself; palet about 
equaling its glume.—Western Texas and Mexico, It has much the appearance of 
Sporobolus confusus. 
* ” * 
Culms erect or decumbent or creeping, much branched. 
27. M. Arizonica, Scribn. Bull. Torr. Club, xv. p.8. Culms closely tufted, mostly 
decumbent or creeping at the base with flowering culm rising successively from the 
same, 10 to 15 inches high; leaves one-half to 2 inches long, narrow; panicles oblong, 
thin, 3 to 5 inches long, capillary, the branches scattered, the lower 1 or 2 inches 
long, subdivided nearly to the base, the pedicels capillary, 2 to 6 lines long; spikelets 
about 14 lines long, purple; empty glumes 4 line long, ovate, acute; flowering 
glume 3-nerved, pubescent on nerves below, bidentate at apex, the awn straight, 
and half line long; palet as long as its glume.—Texas and Mexico. Resembles in 
habit Sporobolus asperifolius. , 
28. M. debilis Trin. Agrost. p. 49. Culms tufted, decumbent and much branched, 
purplish throughout, geniculate and sending up flowering culms which are 5 to 
15 inches long; leaves 1 to 2 inches long, puberulent; sheaths somewhat inflated, 
ligules half line long, lacerate ; panicles 2 to 5 inches long, somewhat contracted, or 
spreading, the branches short (14 to 1 inch long), mostly single, sessile; spikelets 
1 to 1} lines long, on very short pedicels; empty glumes nearly equal, one fourth to 
one-fifth as long as the floret, mostly obtuse or eroded, hyaline; flowering glume 
slender, tapering, scabrous throughout, terminated by a slender awn 1 to 14 inches 
long; palet about equal to the flowering glume. The flowering glume and its awn 
are very early deciduous.—Arizona, South California and Mexico, 
29. M. Texana Thurb. (Coul. Rocky Mt. Fl. p. 410.) Culms diffusely much 
branched and spreading, decumbent and geniculate; leaves about 1 to 3 inches 
lung ; panicle 2 to 4 inches long, naked below, sparsely flowered, spikelets 14 lines 
long, on long capillary pedicels; empty glumes 1 line long, lanceolate, setaceously- 
acuminate; l-nerved; flowering glume 1} lines long, 3-nerved, sparsely pubescent; 
awn 3 to 4 lines long, palet equaling its glume, bidentate at apex.—Texas, Arizona, 
New Mexico to Colorado, Southern California and Mexico. 
30. M. Neo-Mexicana Vasey. Bot. Gaz. XI. p, 337, Perennial; culms mostly 
branched near the base from thickened nodes, wiry, erect, 1 to 2 feet high, scabrous; 
cauline leaves about 5, setaceous, erect, about 3 inches long, the upper one near the 
panicle; ligule short, lacerate; panicle narrow, linear to lanceolate, 4 to 6 inches 
long, the branches unequal, mostly in twos, appressed, the longer 1 to 2 inches long, 
flowering to the base, the branchlets sessile and closely flowered; spikelets sessile 
or nearly so, about 2 lines long without the awn; empty glumes equal, more than 
half as long as the spikelet, lanceolate, acuminate, or awl-pointed, 1-nerved; flower- 
ing glume short-stalked, 3-nerved, narrow, acuminate, and terminating in a straight, 
slender awn 4 to 6 lines long.—Rocky hills and mountain sides New Mexico and Ari- 
zona. 
31. M. pauciflora Buckl. Proc. Acad. Phil. 1862. Culm and leaves as in the 
preceding ; panicle 3 to 4 inches long, narrow, interrupted; spikelets 2 lines long, 
sessile or nearly so; empty glumes half as long asspikelet, ovate below, above short, 
awned ; flowering glume 2 lines long, with a short, blunt stipe, smooth, 3-nerved- 
acute, and with an awn 3 to4 lines long.—Western Texas (No. 732, C. Wright.) 
This closely resembles the preceding and may perhaps be a variety of it. 
32, M. Lemmoni Scribn. Culms much branched at the base, 24 to 2 feet high, 
wiry, leafy; leaves 1 to 2 inches long, 1 line wide, erect; panicles 3 to 4 inches long, 
linear, somewhat interrupted, branches short, erect; spikelets about 2 lines long; 
empty glumes lanceolate-acuminate, 1 line or more long; flowering glumes about 14 
lines long, or with the awn 2 lines; very pubescent below—Huachuca Mountains, 
Arizona (J. G. Lemmon) and Texas (G. C. Nealley). 
