1918] Wiegand,— Some Species and Varieties of Elymus 83 
h. Palet 5.2-6.7 mm. long: rachis-joints 1.5-3 mm. long: 
spikelets 1(rarely 2)-flowered: foliage villous t. 
i. Lemmas and glumes villous-hirsute...............-+5 E. striatus. 
i. Lemmas and glumes glabrous or slightly strigose 
E. stri., var. arkansanus. 
a. Awns curved outward toward apex (when mature and dry): 
palet 9-11(-15) mm. long (occasionally 8 mm. in E. divers- 
igkumis) ). i 
j. Leaves rather thin, usually somewhat villous above: spike 
slender and rather loose: glumes 2-25(-35) mm. long k. 
k. Glumes 2-15 mm. long, setiform: spikelets 2-3-flowered : 
leaves 6-12 mm. wide: lemmas villous-hirsute. . ... E. diversiglumis. 
k. Glumes 15-20 (rarely 8-27) mm. long, rather narrow 
but not setiform, flat above: spikelets 4-7-flowered: 
leaves: 13-20 mm. wide. ic)... cn ae ee E. canadensis. 
j. Leaves firm, 5-15 mm. wide, tending to be involute when 
dry, usually glabrous: spike somewhat denser: spikelets 
2-5(usually 3-4)-flowered: glumes 20-25 (rarely 15-35) 
mm. long, usually broader and flatter 
l. Lemmas glabrous or sparsely hispidulous...........---- E. robustus. 
1; Apes vious-hitmite.. 2... s.o eeren E. robust., var. vestitus. 
E. virainicus L. Sp. Pl. 84 (1753). E. carolinianus Walter, FI. 
Carolin. 82 (1788). E. nitidus Vasey, probably, Bull. Torr. Bot. 
Club, xiii. 120 (1886). Æ. virginicus, var. minor Vasey, small form, 
Contr. U. S. Nat. Herb. ii. 550 (1891). E. virginicus, forma jejuna 
Ramaley, small form, Bull. Geol. and Nat. Hist. Survey Minn. ix. 
114 (1894). E. jejuna Rydberg, Bull. Torr. Bot. Club, xxxvi. 539 
(1909).—Leaves rather narrow, 1.2 cm. wide or less, thin, glabrous or 
somewhat villous above, green or slightly glaucous; upper sheaths 
much inflated: spikes rather narrow, straight, included at base or 
short-exserted; rachis-joints about 5 mm. long: spikelets 2—4-flowered, 
appressed or somewhat spreading: glumes broad (1.5-2 mm.) and 
very short-awned (1.4-2.7 cm. long), strongly indurated and curved 
at the yellowish and usually unstriated subterete base: lemmas 1.8-3 
cm. long, glabrous; awn short and straight: palet 6.5-8 (rarely 8.5- 
9.2) mm. long: grain 5-6 mm. long.— Alluvial bottomlands and 
stream-banks: Newfoundland and Quebec to District of Columbia, 
westward to Montana and Colorado, and southward in the central 
states to Louisiana and Texas. 
Var. halophilus (Bicknell), n. comb. Æ. halophilus Bicknell, Bull. 
Torr. Bot. Club, xxxv, 201 (1908).— Differs from the typical form 
in the lower stature, narrower and involute leaves which are often 
more glaucous, narrower upper sheaths, and more uniformly exserted 
short spikes (glumes 12-17 mm. long; lemmas 1.2-22 mm. long; 
palet 6-8 mm. long).— Brackish marshes and sand along the coast: 
Washington County, Maine, to Long Island. 
Var. HIRSUTIGLUMIS (Scribner) Hitchcock, Ruopora, x. 65 (1908). 
E. hirsutiglumis Scribn. Bull. Div. Agrost. 11, p. 58 (1898). E. inter- 
medius Scribner & J. G. Smith, Bull. Div. Agrost. 4, p. 38 (1891).— 
Differs from the typical form in the villous-hirsute lemmas and 
