69 
sometimes interrupted, the lower branches 1 inch long, appressed ; spikelets 1 line 
long or less; empty glumes nearly equal, one-third shorter than the flowering 
glumes, the latter abruptly short mucronate, pubescent below, rough above.—New 
England to Minnesota and southward. 
20. M. Mexicana Trin. (Gray’s Manual, 6th ed., p.643.) Culms ascending, much 
branched, 2 to 3 feet high; panicles lateral and terminal, often included at base, con- 
tracted, the branches densely spiked-clustered, or linear-contracted, or loose and open, 
2 to 6 inches long; empty glumes slightly unequal, lanceolate, long acuminate, 
about the len.zth of the very acute flowering glume, the latter about 1} lines long, 
sparsely pubescent below.—New England to Colorado and Minnesota. 
21. M. Parshii Vasey. Bull. Torr. Club, x1. p. 53. (AML. sylvatica var. Califor- 
nica.) ‘This grass has the spreading, diffusely branched habit of M. sylvatica, and 
should perhaps be ranked as a marked variety of that species. The narrow panicles 
terminating the long, leafy, terminal and lateral branches are 4 to 6 inches long, the 
rays mostly alternate, the lower ones distant and subspicate, some of them 1 inch long, 
the spikelets sessile and crowed on the branches; the outer glumes membranaceous, 
except the hispid green keel, equal, lanceolate, acuminate, scarcely 2 lines long, rather 
exceeding the flowering glume without its awn; flowering glume about 14 lines 
long, firm, finely scabrous, acute, and terminating in astraight awn about its own 
length, sparingly villose at the base; palet about as long as its glume, acute.—San 
Bernardino Mountains, California (8. B. Parish). 
22. M. Californica Vasey. Bull. Torr. Club, x11. p. 53. (M. glomerata var. brevi- 
folia.) Culms 1} to 2 feet high, erect and leafy; leaves (5 to8 on each culm) rigid, short 
and wide (2 to 4 inches long, 2 to 3 lines wide), somewhat scabrous; panicle spike-like, 
interrupted and with longer branches below; glumes and palets about equal in 
length (1 line), glumes acuminate, scabrous puberulent; flowering glume acuminate 
and tipped with an awn half its length or less, 3-nerved, pubescent below ; palet 
acute, about equaling the flowering glume.—Southeast California (8. B. Parish). 
23. M. Huachucana Vasey n. sp. Culms tufted, much branched at base, 12 to 18 
inches high, leafy; leaves 4 to 6 inches long, 2 lines wide, erect, rather rigid, scabrous ; 
panicle 2 to 4 inches long, narrow, tha lower branches sometimes in twos, all densely 
flowered, erect, contiguous; spikelets 2 lines long, sessile; empty glumes about equal 
14 to 2 lineslong, ovate, acuminate-pointed, the long point scabrous; flowering glume 
about 2 lines long, 3-nerved, with a short awn; palet about as long as its glume. 
Both flowering glume and palet villous pubescent below.—Huachuca Mountains, 
Arizona (J. G. Lemmon). 
24, M. sylvatica T. & G. (Gray’s Manual, 6thed., p. 643.) Culms ascending, much 
branched and ditfusely spreading (2 to 4 feet long); contracted panicles densely 
many-flowered; lower glumes almost equal, bristle-pointed, nearly as long as the 
flowering one, the latter with an awn twice or thrice the length of the spikelet.—Low 
or rocky woods; common. 
25. M. ambigua Torr. (Gray’s Manual, 6th ed., p. 643.) ‘*Culms ascending, 
clustering and branching, 1 foot high; panicles contracted, densely many-flowered ; 
spikelet 2-flowered, the upper flower like the lower and perfect, or more frequently 
reduced to a mere awn at the base of the lower flower; lower glumes nearly equal, 
long pointed; flowering glume villous, as long as the flower and equaling the palet, 
its awn nearly twice longer.—Shore of Elysian Lake, Waseca County, Minnesota 
( Geyer).” 
A remarkable species, approaching Brachyelytrum in the structure of the spikelet, 
but with wholly the habit of Muhlenbergia. 
26. M. Buckleyana Scribn. (MZ. Texana Buckl.) Culms 9 to 12 inches high, much 
branched at the base; leaves few and near the base, linear, 1 to2 inches long; panicle 
oblong-lanceolate, constituting three-fourths the height of the plant, slender, the 
capillary branches scattered, mostly single, erect-spreading, 1 to 2 inches long, 
sparsely subdivided above the middle ; spikelets three-fourths of a line long, on very 
short pedicels; empty glumes somewhat unequal, about half a line long, 1-nerved,ovate, 
