1918] Wiegand,— Some Species and Varieties of Elymus 87 
lemmas villous, 2.3-5 em. long; awn long and straight: palet short, 
5.2-6.7 mm. long: grain 3 mm. long.— Rocky woodlands and dry 
thickets: Vermont and eastern Massachusetts to Delaware, and the 
mountains of North Carolina, westward to Wisconsin, Nebraska, 
Kansas, and Oklahoma. 
Var. ARKANSANA (Scribn. & Ball) Hitchc., Raopora, vii. 212 
(1906). E. arkansana Scribner & Ball, Bull. Div. Agrost. 24, p. 45 
(1901).— Differs from the typical form in the almost or completely 
glabrous glumes and lemmas.— Iowa, Missouri, and Arkansas, 
according to Scribner and Ball. The writer has seen specimens from 
Nebraska and Virginia (Bedford County, A. H. Curtis, July 1871); 
also doubtful ones from Illinois (Stark County, V. H. Chase, no. 45). 
E. prversicLumis Scribner & Ball, Bull. Div. Agrost. 24, p. 48 
(1901).— Plant of medium height, more or less glaucous: leaves 
thin, narrower than in the next, 6-12 mm. wide, more or less villous 
above: spikes much exserted, long, flexuous, nodding and slender 
(10-20 em. long); rachis-joints 5-8 mm. long: spikelets mostly 
appressed, 2- rarely 3-flowered: glumes very short and subulate or 
acicular, unequal, straight (2-15 mm. long), scabrous or smooth, 
yellowish and indurated below: lemmas villous-hirsute, 2-4 em. long; 
the slender awns much curved when dry; palet 8.5-9 mm. long.— 
Wisconsin, Minnesota, North Dakota, and Wyoming. 
This plant seems to be limited to the northern Great Plains region, 
and the few specimens at hand would indicate that it is scarce. There 
is in the Gray Herbarium a specimen which from the label would 
seem to be a portion of the type material of Buckley’s E. interruptus. 
At first glance this is difficult to distinguish from EF. diversiglumis, 
but the glumes are somewhat longer and the lemmas are glabrous. 
It was matched by no other material at hand. 
E. CANADENSIS L., Sp. Pl. 83 (1753). E. philadelphicus L. Amoen. 
Acad. iv. 266 (1759). E. glaucifolius Muhl. in Willd. Enum. Hort. 
Berol. 131 (1809). E. Canadensis, var. glaucifolius Torr. Fl. U. S. i. 
137 (1824).— Plant tall and more or less glaucous: leaves thin and 
broad, the larger 1.3-2 cm. wide, not involuting, villous above, rarely 
nearly glabrous: spikes exserted, rather loose and long (10-30 cm. 
in length), flexuous and nodding; rachis-joints 5-8 mm. long: spike- 
lets slightly spreading, 15-25 mm. long, (3-)4-7-flowered: glumes 
shorter than in the next (2-27, usually 15-20 mm. long), flat but rather 
narrow, slightly indurated at base, straight, glabrous, scabrous or 
hispidulous, tapering to the short awn: lemmas villous-hirsute, rarely 
almost glabrous, 3.54.5 cm. long; awns long and curved when mature 
and dry: palet 9-15 mm. long: grain 7-8 mm. long.— Alluvial or 
sandy riverbanks: Gaspé County, Quebec, to the interior of Maine, 
New Hampshire, Vermont, western Massachusetts, northern Connecti- 
