84 | Rhodora [May 
glumes.— Coast of Maine to Pennsylvania and westward to Nebraska 
and Missouri. 
Var. suspmuticus Hooker, Flor. Bor.-Am. ii. 255 (1840). ?E. 
curvatus Piper, Bull. Torr. Bot. Club, xxx. 233 (1903).— Differs from 
the typical form in the almost complete absence of awns on both 
glumes and lemmas.— Dartmouth River, Gaspé County, Quebec, 
and the coast of Massachusetts, and from Illinois to Saskatchewan, 
Nebraska, Kansas and Oklahoma, also in Washington (Piper). 
Specimens of E. virginicus from central Maine (Penobscot Valley) 
have unusually large and coarse spikes and large spikelets with the 
palet 8.5-9.2 mm. long. Æ. halophilus is here maintained as a variety 
as it differs from the typical form only in minor and variable characters. 
Many specimens along the coast are transitional in width of leaf, 
degree of involution, and length of spike. 
E. AUSTRALIS Scribner & Ball, Bull. Div. Agrost. 24, p. 46 (1901).— 
Leaves 12 mm. wide or less, thin, sparingly villous above, rarely 
glabrous, green or slightly glaucous; upper sheaths scarcely inflated: 
spikes more or less exserted, straight, 8-14 cm. long; joints of the 
rachis 3-6 mm. long: spikelets usually slightly spreading, 2—4-flow- 
ered: glumes elongated, of medium breadth (2.74 cm. long, 0.9- 
1.1 mm. wide), thick and indurated toward the curved, usually 
unstriated, yellowish base, villous-hirsute: lemmas 3.5-4.5 cm. long, 
villous-hirsute; awn long and straight: palet 7-8 mm. long: grain 
5 mm. long. Swampy woods and stream-banks, rarely in drier 
situations, along the coast from eastern Massachusetts to Georgia; 
and also in Missouri and Nebraska. The Missouri labels seem to 
indicate drier situations. 
Var. glabriflorus (Vasey),n.comb. ŒE. canadensis, var. glabriflorus 
Vasey, Contr. U. S. Nat. Herb. ii. 550 (1894). E. glabriflorus Scribner 
& Ball, Bull. Div. Agrost. 24, p. 49 (1901).— Differs from the typical 
form in the glabrous or merely strigose-scabrous glumes and lemmas; 
the former slightly broader (1.1-1.8 mm. wide). Dry banks and woods: 
Ayer, Massachusetts (Manning); and from Maryland to Florida, 
westward through Tennessee and Illinois to Nebraska and Texas. 
E. australis is a near relative of E. virginicus from which it differs 
only in the longer awns, more regularly exserted spikes and more 
generally villous leaves. The differences are, however, sufficiently 
constant and obvious to warrant its retention as a valid species. 
E. riparius, sp. nov., procerus; foliis 7-25 mm. latis tenuibus 
viridibus vel leviter glaucescentibus glabris, vaginis strictis glabris; 
spicis multum exsertis parum nutantibus 7-20 em. longis (aristis 
exceptis); spiculis 2—4-floris subpatentibus, segmentis racheos 3—4.5 
raro 5-8 mm. longis, glumis scabris angustissimis (0.4-0.8 mm. latis, 
1.8-3 cm. longis) basi tereti indurata flavescente non striata recta, 
