CYPERACEAE 163 
the achene: achene obovoid, about 1 mm. long, T -blaek, s tubercle de- 
pressed or saucer-shaped w with a minute tip.—Maoist soil, swamps, and sink- 
holes, o Plain and adj. provinces, Fla. to Tex Tnd., and Md.— T OV. I. 
Merx., C. A., 8. A. leri. referred to E. capitata, in erro 
12. E. uncialis Chapm. Annual, mostly 1-6 cm. tall, the A i in 
angled: upper leaf- sheath ue i obtuse EUROS ovoid, 2-3 m ral- 
flowered: scales pale, w midrib and searious B "LS " 
long, lax in age: UE rintios ver one-half as long as the achen 
achene ellipsoid-obovoid, 0.7 mm. long, whitish, smooth, the tubercle oo 
conic, much narrower than the achene —Damp pi inelands, N Fla 
13. E. bicolor Chapm. VE 1-2 ns tall, the scapes 4-angled: upper leaf- 
sheath very thin: spikelet o oid, 2-3 mm. long, few- MAE seales d 
dark-brown except the pale ee ib d is 1.5-2.5 mm. long, lax in age: 
oe -bristles nd 15 as long as the achene: achene ellipsoid. a about 
0.8-1 mm. long, bro the tubercle dit , the base nearly as wide as the 
achene.—Moist to oU pinelands, Coastal Plain, Fla. and Ga. 
14. E. obtusa (Willd.) Schultes. Annual, 1-7 dm. tall, the scapes nearly 
terete: upper p? Mon xs : tooth- ike blade: e ovoid to elli rd 
ovoid, 3-13 mm. long, red: scales thin, ee aN , 1:5-2 mm. yo 
usually Ru xu dados longer than the ne: ‘achene turbinate- 
obovoid, 1.5 mm. long or less, Bae -brown, the eae ‘deltoid, the base some- 
what narrower than the achen "E ts oil a nd mud, various provinces, Fla. to 
Tex., Ont., and N. 8.; also Calif. Md 
15. E. Engelmannii Steud. Annual, 1-5 dm. tall: upper e ae ae 
or with a tooth-like blade: ip cylindric or conic-cylindric 
many-flowered: scales brown, 1.5-2 . long, obtuse, oppress ane "perian 20s 
bristles about as long as fie Np or “sometimes rudim entary or wanting: 
achene turbinate-obovoid or som mewhat cuneate, 1.5 mm. long or | pale- 
brown, the tuberele very low, the base nearly as wide as the ac = ne. — We t soil 
and ditehes, various provinces, Ga. to Tex., Calif., Mo., and Mas 
16. E. nodulosa pun Schultes. Perennial, up to 1 m. tall, the scapes une se: 
upper 2 sheath truneate or minutely poi inted: o pu conic-cylin p , 1-2 
. long, many- aon cae scales brownish, 2-3 mm. long, or sometim 2 nger 
obtuse, Ao dd. below the apex, closely imbrieate: perianth- bristles as 
shorter or longer obovoid, about 1 m n 
lon the 
turgid, "the aD. deltoid, fully 15 as p as d achene dbi Coastal 
Plain and Basin-and- -Range province, Fla. to Tex. and Ariz.—(W. I., 
C. A., S. A.) 
ae B. calva a Perennial, up to 1 m. tall, the scapes often tufted, 
ender, not nodose: upper r leaf-sheath Dis - a ae spikelet 
lips Or ellipsoid. RAM. 0.5-1.5 em. long, many-flowered: seales brown 
ark-green, 2.5-3.5 mm. lo ong, blunt or ai cus : perianths “bristles as oE 
as a achene or shorter: a obovoid, about 1.5 m ong, brown, the tuber 
cle koe ae constricted e the base. [ E. disuccscens iM SE. U. iy — 
Swamps an S, various provinces, Fla. to Tex m rs Minn., and Ont. 
M related soe es E. macrostachya ee mith 2 or 3 empty bracts at the 
base of the spikelet, instead of one n E. calva, has been found at New 
Orleans, La. 
18. E. acicularis (L.) R. & S. Perennial with slender rootstocks, 0.5-2 dm 
a or greatly elongate when submersed, the scapes 4-angled, filiform or seta- 
: leaf-sheaths truncate: spikelet fl attened, narrowly ovate to linear-ellip- 
oid, 3-10 mm. long, few-flowered: scales pale-green, except the usually brown 
