164 CYPERACEAE 
bands on either side of the midrib, 1.5-2 mm. long: aed. Pod fully as 
long as the achene or shorter: achene ellipsoid obovoid, 1m ong or shorter, 
the tubis conie from a narrow base, about E as long as p» achene.—Wet 
1 muddy Ca 
19. E. retroflexa (Poir.) Urban. Perennial or annual (?), 0.5-2 dm. tall, the 
seapes 4-angled, filiform: leaf-sheaths often with minute blades: Een ellip- 
soid to ovoid-ellipsoid, 2-3 mm. long, few-flowered: scales pale, m. long: 
eae baat tles as long as the achene or much shorter: achene sbovold, ‘barely 
m. long, the tubercle pyramidal with a broad base, shorter t han the ae 
UE chaetaria R. & S.]—Sandy soil and low grounds, Coastal Plain, S Ala. 
, €. A., 8S. A.) 
0. E. vivipara Kunth. Perennial, 1-3 dm. tall, the scapes flattened: leaf- 
sheaths Miis with a short blunt tip: spikelet linear- -ellipsoi id, 4-7 mm. long, 
ou doeerd often sparingly proliferous: scales whitish, 2-3 mm. long, thin 
y 
ale, 
a broad base.—Low grounds and marshy shores, Coastal Plain and occas} ionally 
adj. provinees, Fla. to Tex. and N. C. 
21. E. simplex (Ell) A. Dietr. Annual, 1-4 dm. tall, the scapes we Ld a 
angled: leaf- o obliquely truneate: spikelet ovoid. or elli ipsoid, 
-fl long, firm 
long, several-many-flowered: scales pale, 2-3 mm. long, : perianth- Xue 
s longer d the achene: S ik pde about 1.5 mm. long, turgid, 
ely marked, th rele a much constricted at the base, 
oa 
Wr at the apex. [£. tortilis (in " Schultes. ]—Wet soil and marshy 
woods, Coastal Plain, Fla. to Tex. an 
-0voi : ish- 
cept the dark midrib, 2.5-3.5 mm. long, firm: Pu erianth- bristles as longer 
than the achene: achene obovoid, about 1.5 mm. long, coarsely marked, the 
ubercle miter-like, as pr as the achene - largon Moist to to vet, often acid, 
fas 
. E. microcarpa Torr. Annual, 0.5-2 dm. tall, the scapes e 4- anes 
leaf-sheaths usually minutely pointed: spikelet o oblo ong or nearly s 
long, few-flowered: scales pale o r with brownish patches on either ide " pe 
midrib, 1-1.5 mm. long, thin: Pu EN shorter than the achene: achene 
ellipsoid-obovoid much constrieted at the narrow base, mm. long or a little 
longer, grayish-white, smooth or nearly so, the d erar depressed- conie, minute, 
base less than Me as Du as the achene. — Moist to wet soil, Coastal Plain, Fla. 
o La. and S. C.—(W. I.) 
4. E. Torreyana aera Annual, 1-6 dm. tall, the scapes somewhat 4-angled, 
sometimes proliferous at the spikelet: upper leaf- sheath obliquely Gu d 
Videre ie or deed -ellipsoid, 3-6 mm. long, se veral- many-flowered: scales 
firm: 
, pale-brown, s the tubercle minute, ia aa A t 
a Sie usually acid, PER poen Plain, Fla. to Tex. and N. J—(W. I.) 
25. E. Brittonii Sve Annual, like E. Torreyana in habit: spike- 
let ellipsoid to dir "ellipsoid, 2.5-5 mm. long, several-flower dis scales obtuse, 
closely concealing the achenes which they much exceed in length, scarious-mar- 
gined: perianth- bristles very short or obsolete: achene pyriform, about 0.7 mm. 
