ALOPECURUS | GRAMINEA 741 
scabrous, sometimes hispid below: flowering glume equalling or exceeding 
the outer ones, smooth, the awn inserted near the base, about twice its 
length. In waste places and ballast grounds, introduced from Europe. 
A. geniculatus L. Sp. 60. Stems slender, 6-18 inches high, erect with 
decumbent geniculate base, simple or sparingly branched, smooth: sheaths 
usually shorter than the internodes, loose or somewhat inflated: ligules 
i-3 lines long: leaves 1-6 inches long, 4-2 lines wide, scabrous, especially 
above: panicle 1-3 inches long, 4-2 lines thick: i a glumes slightly 
united at base, 1-144 lines long, obtuse or subacute, glabrous except on the 
pubescent lateral nerves and strongly ciliate keel: flowering glume some- 
’ what shorter, obtuse, glabrous, the awn inserted at or below the middle, 
equalling or exceeding it. Common in wet places, California to Alaska 
and across the continent. 
Var. robustus Vasey Bull. Torr. Bot. Club xv, 13. Stems 20-30 
inches long, sometimes branched: leaves flat, hispid above, 3-6 inches 
long, 2-3 lines wide. In the mountains, Washington to Alaska. 
A. pRATENSIS L, Sp. 60. Stems slender 12-30 inches high, simple, erect : 
sheaths usually much shorter than the internodes, loose or somewhat in- 
flated: ligules about ‘4 line long, erose-truncate: leaves 2-4 inches long, 
1-3 lines wide, scabrous, at least above: panicle 1-3 inches long: 4-6 lines 
wide: outer glumes, united at base for about 14 their length, 2-3 lines 
long, acute, glabrous except the sparingly pubescent lateral nerves and 
the strongly ciliate keel: flowering glume slightly shorter, obtuse, glabrous, 
the awn inserted about 14 way from the base and surpassing it. Common 
in cultivation and waste places: naturalized from Europe. 
A. Californicus Vasey ].c. Stems slender, smooth, geniculate below, 
10-15 inches long often branched: sheaths loose, the upper one inflated, 
smooth, shorter than the internodes: ligules about 2 lines long, acute: 
leaves 1-5 inches long, flat, hispid above: panicle cylindrical, dense, 1-2 
inches long, 14-3 line thick: empty glumes oblong, obtuse, carinate slightly 
united at base,thin, purple above, hairy on the keel, and slightly pubescent 
the obscure lateral nerves, 114-134 lines long: flowering glume oblong- 
ovate, obtuse, its edges united 144 way from the base, smooth, about equal- 
ling the lower cnes: awn arising near tue base of the glume twisted, bent 
near the middle, 2-3 lines long: palet wanting. In wet places, California. 
to the Willamette Valley Oregon and Idaho. 
A. pallescens Piper Fl. Palouse Reg. 18. A pale green smooth tufted 
perennial: stems 16-24 inches high, erect, or slightly geniculate below: 
sheaths shorter than the internodes, inflated, smooth: ligules scabrous, 
144-2 lines long: leaves flat, 3-12 inches long, 1-3 lines wide, acuminate, 
strongly scabrous above: panicle usually well exserted, pale and silvery, 
1-3 inches long, about 3 lines thick, erect: empty glumes nearly equal, 1-3 
lines long, strongly ciliate on the keel, obtuse: flowering glume hyaline, 
2-nerved, as long as the outer ones, obtuse: awn arising near the base, 
stout bent, 3 lines long. Common in wet places about Pullman Washington. 
A. saccatus Vasey Bot. Gaz. vi, 290. Tufted, apparently annual: 
stems erect, or slightly geniculate at base 5-10 inches high, smooth, simple: 
sheaths rather loose, the bs se one inflated, slightly roughened usually 
ehorter than the internodes: Jigules membranaceous, 14 lines long: leaves 
narrow, rough on both sides, 1-3 inches long: empty glumes united at base, 
ovate-oblong, barely acute, carinate, scabrous at the apex, puberulent 
thronghout, ciliate on the keel and lateral nerves, 2 lines long: flowering 
glume broadly oblong, truncate, the margins united to the middle or 
above, smooth except the ciliate apex, 4-nerved, 2 lines long: awn arising 
near the base of the glume, twisted, bent 3-4 lines long: palet wanting. 
On the margins of poolsthat are dry in summer, eastern base of the Cascade 
Mountains at Barlow Gate, Oregon. 
