BECKMANNIA GRAMINE A 735 | 
BOUTELOUA 
S. cynosuroides Willd. Enum. 80. Stems 2-6 feet high, simple, smooth: 
sheaths longer than the internodes, those at the base of the stem crowded: ligules 
a ring of hairs: leaves a foot long or more, 3-7 lines wide, scabrous on the mar- 
gins, becoming involute in drying, attenuate into long slender tips: spikes 5-30, 
2-5 inches long, often on peduncles 6-12 lines long, erect or ascending: rachis 
rough on the margins: spikelets much imbricated, 6-7 lines long: empty glumes 
2-4 lines long, awn-pointed or awned, strongly hispid-scabrous on the keel: 
flowering glume as long as the first, the scabrous midrib terminating just below 
the emarginate or 2-toothed apex: palct sometimes exceeding the glume, Along 
streams, eastern Oregon to Nova Scotia and Texas. 
S. gracilis Trin. Mem. Acad. St. Petersb. vi, 110. Stems 1-3 feet high, 
erect, smooth: sheaths longer than the internodes, the lower ones crowded: 
ligules a ring of short hairs: leaves 6-12 inches long, 1-3 lines wide, flat or in- 
volute, attenuate into long tips: spikes 4-8, 1-2 inches long, appressed, more 
or less peduncled: empty glumes 3-4 lines long, acute scabrous-hispid on the 
keel, the first half as long as the second: flowering glume obtuse, slightly shorter 
than the second one: palet obtuse, about equalling the glume. In wet mead- 
ows, eastern Oregon to Brit. Columbia and Nebraska. 
18 BECKMANNIA Host. Gram. Austr. iii, 5. 
Tall erect grasses with flat leaves and erect spikes in a terminal 
panicle. Spikelets one- or two-flowered, compressed-globose. 
Glumes 3 or 4, the two lower empty membranous, saccate, obtuse 
or abruptly acute: flowering glumes narrow, thin-membranous. 
Palets hyaline, two-keeled. Stamens 3. Styles distinct, with 
plumose stigmas. Grain free, enclosed in the glume and palet. 
B. eruceformis Host 1. c. Glabrous throughout: stems often stout, 2-3 
feet high, erect: sheaths longer than the internodes, loose: ligules 2-4 lines long, 
obtuse, often lacerate: leaves 3-10 inches long, 2-4 lines wide, rough: panicle 
4-10 inches long, simple or compound, the spikes about 6 lines long: spikelets 
1-2 lines long, 1-2-flowered, closely imbricated in 2 rows on one side of a 
fiattish rachis: glumes smooth, the first two saccate and empty, obtuse or 
abruptly acute: flowering glumes acute, the lower usually awn-pointed. Com- 
mon in ditches and along streams, California to Brit, Columbia and Iowa. 
19 BOUTELOUA Lag. Var. Cienc. y Litter Part 4, 134. 
Annual or perennial grasses with flat or convolute leaves and 
numerous spikelets in one-sided spikes. Spikelets one- or two- 
flowered, arranged in two rows on one side of a flat rachis, the 
rachella extended beyond the base of the flowers, bearing 1-3 
awns and 1-38 rudimentary glumes. Two lower glumes empty, 
acute, keeled : flowering glumes broader, 3-toothed, the teeth awn- 
pointed or awned. Palets hyaline, entire or toothed. “Stamens 
3. Styles distinct, with plumose stigmas. Grain free, oblong. 
B. oligostachya Torr, Gray Man. ed 2, 553. Stems 6-13 inches high,. 
glabrous: sheaths shorter than the internodes: ligules a ring of short hairs: 
leaves 1-4 inches long, 1 line wide or less, involute, at least at the long slender 
tips, smooth or scabrous: spikes 1-3, 1-2 inches long, often strongly curved, 
the rachis terminating in a short inconspicuous point: spikelets nuierous, 
pectinately arranged, about 3 lines long, first glume hyaline, shorter than the 
membranous second one which is scabrous and sometimes long-ciliate on the 
keel: flowering glume pubescent, 3-cleft, the nerves terminating in awns: ra- 
chella with a tuft of long hairs under the rudimentary glumes and awns. On 
