724 GRAMINEZ SPOROBOLUS 
POLYPOGON 
S. Bolanderi Vasey Bot. Gaz. xi, 327, Stems slender, about 1 foot 
long, decumbent below, smooth: ligules,short and obtuse: leaves narrow, 
flaccid, the radical ones about 6 inches. long: cauline ones similar, 1-2 
inches long: panicle 2-3 inches long, open. lax, its lower branches in twos 
-or threes, filiform, 12-18 lines long: empty glumes ‘unequal, 1-nerved; 
flowering glume exserted, 5-nerved, softly pubescent on the nerves below. 
Collected at Multnomah Falls Oregon by Dr, H. N. Bolander. 
S. confusus Vasey Beal Grasses N. Am. ii, 294. Stems slender, 
tufted, branching, 3-8 inches high from an annual root: sheaths loose: 
leaves flat, 6-12 lines long: panicle ovoid or oblong, with loose capillary 
‘branches: spikelets less than a line long, smooth, on capillary pedicels 3-4 
times as long: empty glumes subequal, obtuse or retuse at the apex; flow- 
ering glume but little longer, barely acute. On sandy banks of streams, 
eastern Washington to California, Colorado and Montana. 
S. gracillimus Vasey Vilfa gracillima Thurber. Stems capillary, 
smooth, much branched at base, forming small dense tufts, 3-12 inches 
high, the leafy portion about 2 inches high: sheaths equalling the inter- 
nodes, smooth, with hyaline margins: ligules about a line long, obtuse and 
lacerate: leaves 3-6 lines long, less than a line wide, flat, involute at the 
apex, very minutely scabrous on the upper side and margins: panicle long- 
exserted, narrowly linear, few-flowered, interrupted below, its branches 
in twos or threes, appressed: spikelets about 1 line long: empty glumes 
subequal, inembranaceous, very obtuse, distinctly 1-nerved, mucronate or 
erose-dentate at the apex: flowering glume 3-nerved, mucronate or tipped 
wane small awn. Edge of marshes in the high mountains, Oregon to 
alifornia. 
S. simplex Scribn. U. S. Dept. Agr. Bull. 11, 48. A densely cespi- 
tose leafy annual, 2-6 inches high: stems slender, smooth: lower sheaths 
loose, longer than the internodes: ligules a line or more long: leaves flat, 
1-2 inches long, scabrous on the margins, very rough near the rigid apex: 
panicle linear, 1-2 inches long, its scabrous branches erect: spikelets 1 line 
long: empty glumes subequal,obtuse or truncate,scabrous on the back above, 
flower twice as long as the glumes: flowering glumes 3-nerved, mucronate 
pointed, scabrousabove. In moist places, Idaho to California and Colorado. 
S. filiformis Scribn. 1, c, Bull 17, 173. A very slender densely tufted 
annual, 8-12 inches high: stems filiform and scape-like, with very short 
internodes below: leaves filiform, 6-12 lines long: panicle linear, long-ex- 
serted spikelets less than a line long: empty glumes subequal, obtuse and 
mucronate, flowers about twice as long as the empty glumes; flowering 
glume acute, 3-nerved, scabrous on the midnerve. In moist soil in the high 
mountains, Washington to California and Utah. 
11 POLYPOGON Desf. Fl. Atl. i, 66. (1798.) 
Annual or perennial grasses with flat leaves and numerous 
flowers in spike-like panicles. ‘ Spikelets 1-flowered. Glumes 3, 
the 2 outer empty, nearly equal, compressed, 1-nerved and bear- 
ing a long awn at or below the apex. Flower much shorter than 
the empty glumes, without manifest callus and naked at base, 
Flowering glume hyaline, broad, 1-nerved, truncate, toothed. 
awned at the apex: scales 2, falcate, entire, as long as the ovary. 
Stamens 3, with small anthers. Styles short, with long feathery 
stigmas. Grain free, enclosed in the glume and palet. 
P. Monspeliensis Desf. 1. c. 67. Stems 6-30 inches high erect from a 
procumbent geniculate base, often branching from the lower nodes: sheaths 
smooth usually shorter than the internodes: ligules 2-3 lines long, obtuse: 
