64 
branches in twos or threes, filiform, 1 to 14inches long, flowering above the middle; 
spikelets about2 lines long; empty glumes unequal, 1-nerved, upper one, ovate-lanceo- 
ate, 1 line or more long, lower one one-fourth shorter; flowering glume nearly 2 lines 
long, oblong-lanceolate, 5-nerved, softly pubescent on the nerves below; palet equal- 
ing its glume, finely ciliate on the nerves; sterile pedicel prominent, one-third to 
one-half as long as the flower.—Collected at Multnomah Falls, Oregon (Dr. H. N. 
Bolander). 
29. S. confusus Vasey. Bull. Torr. Club, xv. p. 293. (S. ramulosus of authors 
not of Ath.) Annual; culms 6 to 12 inches high, erect, slender, branched below ; 
leaves mostly near the base, about 1 inch long, acute; panicle nearly as long as the 
plant, 4 to 10 inches long, 1 to 2 inches wide, the branches approximate, mostly 
single, capillary, 1 inch or less in length, erect-spreading, each with few long cap- 
illary, clavate pedicels; spikelets one-half line long; empty glumes one-half to 
two-thirds as long as the spikelet, mostly ciliate fringed on the margin.—Texas 
and Mexico and northward to Montana. 
§ 4. Culms decumbent and often rooting below; branched panicle open and spreading, 
perennials, 
30. S. asperifolius Thurb. Bot, Cai. u. p. 269. Culms 6 to 15 inches long, 
decumbent at base and forming extensive plats; leaves short (1 to 2 inches long), 
narrow, fine pointed, flat or folded; sheaths smooth, leaves sometimes rough on the 
margins and upper surface; ligule short and obtuse, lower sheaths inflated ; panicle 
included at base, expanded and capillary, 3 to 5 inches long, oblong or ovoid in ont- 
line, branches fine, 1 to 2 inches long, mostly single; spikelets few, about one-half 
line long, on long capillary pedicles (often an inch long); empty glumes nearly 
equal, acute, minutely scabrous, as long as the flowering glume and palet.—Texas, 
northward and westward. 
Var. MAJOR. Much longer, runners often 2 feet long, leaves, especially the upper 
ones, 3 to 4 inches long, culms longer; spikelets nearly a line long; empty glumes 
equal, acute, one half to one quarter shorter than the flowering glume a and palet; the 
glumes sometimes tipped with a short point. 
31. S. auriculatus Vasey. (S. asperifolius var. brevifolius, Contr. Nat. Herb. 
I. p. 56.) In habit like the preceding species, the leaves more crowded and rather 
shorter, the panicle longer stalked, and not so large; ligule lacerated and the outer 
segments acute and auriculate; panicle roundish; spikelets 1 line long, empty glumes 
about half as long as the spi kelet, the flowering glume obtusish and mucronate tipped ; 
the second glume often denticulate.—Texas (C. Wright, No. 737), also Sandy plains 
in Crockett County (Reverchon), and at Pena (Nealley). 
MUHLENBERGIA Schreb. 
Spikelets 1-flowered, small, paniculate, articulated above the outer 
glumes; flowering glume with a very short, usually hairy callus. Outer 
glumes variable in size, from small or minute to nearly as large as the 
flowering glume, sometimes bristle-pointed, keeled, persistent, thin; 
flowering glume 3- to 5-nerved, rigid or thinnish, mucronate or awned, 
sometimes with a long capillary awn from the apex between the short 
teeth, frequently pubescent below; palet about as long as the flowering 
glume and of similar texture. 
A, Culms generally tall, unbranched. 
1. Panicle loose and spreading, the pedicels capillary. 
1. M. capillaris Kth. 
2. M. affinis Trin. 
3. M. Reverchoni Vasey. 
