71 
Closely related to M. Huachuacna, of which possibly it is a small variety. 
33. M. Pringlei Scribn. Hardly distinguishable from the preceding except by the 
8 to 10 lines long awn.—Santa Rita Mountains,fArizona (Pringle, No. 480). 
34. M. monticola Buckl. Proc. Acad. Phila. 1862. Culms tufted, slender, wiry, 
often geniculate and branched below; leaves narrow, 2 to 3 inches long; sheaths rather 
shorter than the internodes, ligule white, short, lacerated ; panicles terminating the 
branches, 2 to 4 inches long, loose, branches sessile or nearly so, single, one-half to 14 
inches long; spikelets sessile, about 2 lines long ; empty glumes unequal, linear-lance- 
olate, not awned nor pointed, the upper 14 lines long, the lower a little shorter, both 
l-nerved; flowering glume 1} to 2 lines long, pubescent on the nerves below, awn 
about 8 lines long; palet equaling its glume, awl-pointed.—Texas (8. Buckley, 
Havard, G. C. Nealley), Arizona (J. G. Lemmon and Pringle), New Mexico (Jones) and 
Mexico (Pringle). 
35. M. parviglumis Vasey. Culms 1 to 2 feet high, rarely unbranched except at 
the base, commonly sparsely long-branched above the base; leaves 1 to 4 lines long, 
involute, rataer rigid, narrow; ligule short, fimbriate; panicles 4 to 7 inches long, nar- 
row, branches single or the lower in twos and sometimes 14 inches long, appressed, 
flowering to the base; pedicels very short to 2 lines long, thickened upward; empty 
glumes minute, nearly equal, obtuse or obtusely crenate, one-fourth to one-fifth as long 
as the flowering glume, the latter 14 lines long, with 2 sharp teeth at apex, and between 
the teeth an awn 6 to 10 lines long,—Texas (G. C. Nealley). 
36. M. dumosa Scribn. Culms suffrutescent, 3 to 6 feet high, smooth, from a thick 
woody rhizoma, very much branched; leaves filiform, 2 inches long, very numerous; 
panicles numerous on the branches, oblong-lanceolate, about 1 inch long, loosely 
fldwered, intermingled with the leaves; spikelets about 14 lineslong; empty glumes 
nearly equa], about one-half line long; flowering glume narrow, terete, prominently 
3-nerved, pubescent below, tipped with an awn 2 lines long; palet rather longer 
than the glume.—Arizona (Pringle and Lemmon), Mexico (Pringle) and southern Cali- 
fornia (Orcuté). 
37. M. Schaffneri Fourn. Gram. Mexicanum, p. 65. Tufted, dwarf, 1 to 4 inches 
high, much branched, the branches linear, leafy below; leaves 4 to 1linch long, 
sheaths loose; the upper part of each branch bears short, linear, 8 to 10-jointed pani- 
cles, each joint having a branch with 3 to 5 sessile spikelets; empty glumes unequal, 
the larger 2 lines long, 3-nerved, toothed or lacerated at apex, the smaller mostly 
shorter and l-nerved; flowering glume 14 lines long, with an awn as long; palet 
equaling its glume.—Arizona (Lemmon and Pringle) and Mexico (Pringle). 
Var. LONGISETA Scribn. ditiers principally in having longer awns of the flowering 
glumes.—Same localities, 
BRACHYELYTRUM Beauv. 
Spikelets 1-flowered and with a sterile rudiment, appressed, in a 
simple racemose panicle; outer glumes minute, unequal, the upper and 
larger about half a line long, persistent; flowering glume chartaceous, 
rigid, produced at the apex into an awn 8 to 10 lines long; palet hyaline, 
2-keeled, bifid at apex. The pedicel (continuation of the rachilla) is 
bristle-like, half as long as the palet, and partly lodged in the groove on 
its back. 
1. B. aristatum Beauv. Culms slender, 2 to 3 feet high, from creeping root-stocks; 
sheaths downy, leaves broad, lanceolate, 4 to 6 inches long; spikelets 5 to 6 lines 
long, without the slender 8 to 10-line long awn; sterile pedicel bristle-like, one-half 
as long as the flowering glume.—Rocky woods, common from Maine to Minnesota, 
Var. ENGELMANNI Gray. A western form with the second empty glume awn- 
pointed, nearly half the length of the floral one, 
6 
