CYPERACEAE 165 
long, whitish, smooth, the ‘tubercle a disk-like crown with a minute tip.—Flat- 
woods and shallow ponds, Coastal Plain, N. Fla. to Tex. and S. C. 
o a i 
age: cuu ee about one half as long as the achene: achene ellipsoid- 
obovoid, about ong, pale-brown, smooth, the ponens depressed-conic. 
—Damp td Goal Plain, S. C. 
27. E. Curtisii Small. Annual, 0.5-1 dm. tall, the scapes filiform, striate and 
somewhat angled: upper leaf- sheath oblique, discolored at the e edge, minutely 
duds Ed ovoid-ellipsoid, 2-3 mm . long, E Pudet scales pale, with 
a brownish midrib and scarious mar , 15-9 m m. long, lax in age: perianth- 
bdo shorter than the achene: "ee broadly obov oid, 0.8 mm. long, light- 
brown, irregularly dad -retieulate, the tubercle broadly conie.—Damp soil, 
Coastal Plain, Wilmington, N. C. 
28. E. prolifera Torr. Annua 1, 1-6 dm. tall, the seapes often diffuse or float- 
ing, flattened: leaf-sheaths acad truneate or minutely pointed: spikelet conie, 
4—8 ting iti 
In 1 
2-9 mm. long; ba ee shorter than the achene: ene obovoid, 
ate than , pale, smooth, the tubercle deltoid or dones. conie, 
nd N. C. 
more or less diffus e, groo oved: upper leaf-sheath oblique and often minutely 
pointed: spikelet ellipsoid, 4-6 mm. long, flattened, dpud often prolifer- 
ous and rooting: scales brown or brownish, narrow, 3-5 mm. long: perianth- 
r 
wit 
like base, and subulate tip.—(RoAp-GR ASS. )—Damp pi inelands, pud 
along RI Coastal Plain. Fla. and Ga. 
30. E. melanocarpa Torr. Perennial, 1-5 dm. tall, the scapes stout, wiry, 
flattened: upper leaf-sheath usually with a tooth Tke iae "Spikele ellipsoid 
or cylindrie-oblong, 6-12 mm. long, thick, many-flowered : rown, except 
the lighter midrib and scarious margins, broa d, ees m. Jong: near cd: 
as long as the achene - 2 or shorter or obso ne obpyramidal 
cuneate-turbinate, abou mm. long, black, ia e ido pone, about 
broad as the achene b covering its top, minutely pointed in the middle 
(BLACK-SPIKERUSH.)— Wet sandy soil, Coastal Plain and New England S 
Fla. to Mass.; also Great Lake Lowland, Ind.— (WW. I.) 
E. albida Torr. Annual (?), 1-2 dm. tall, the scapes nearly terete: upper 
P ins usually with a tooth-like blade: spikelet ovoid-globose or ellipsoid, 
5 mm. long, 
4-8 mm. long, many-flowered: scales pale-green or nearly white, 2-2. 
firm: _porianth “bristles about as long as the achene: a broadly obovoid 
he tube RM To w-conic, sessile on the achene.—Dam p o wet, 
abou m. lon 
a iu Eu Coastal Plain, Fla. to Tex. and Md.—(W. I., 
32. E. tricostata Torr. Perenni 6 dm. tall, the scapes flattened: ig hes 
leaf-sheath with a tooth m blado: spiel ellipsoid to cylindric, 6-18 m 
long, aed Eddy seales brown except the en a ib and hs ma 
margins, 2-3 m lo ong, a Re: bonu -brist ing: achen ovoid, 
mm. ine or less, xm prominently 3-angled, pss T A a tubercle 
low-eonie, with a broad base, aeute.—Wet, often acid, soil, Coastal Plain, Fla. 
to N. Y. | 
