520 CYPERACEJE. (SEDGE FAMILY.) 
smooth, orbicular, 2-cleft, mucronate ; anthers obtuse; style 2-cleft; nut round- 
obovate, plano-convex, as long as the 6 hispid bristles. — Brackish marshes, West 
Florida, and northward. June- Sept. — Culms 2°-4° high. Leaves 2/-—4! long. 
Spikes 2” long. 
+w + Spikes umbelled. 
5. S. lacustris, L. Culm tall (39 - 8? high), terete, leafless, or the radical 
sheaths leafy-pointed ; involucre 1-leaved, pungent, shorter than the decompound 
umbel; spikes ovate or oblong, mostly clustered ; scales ovate, emarginate, rough- 
awned, ciliate on the margins, pubescent on the back and green keel ; style 2-cleft ; 
nut obovate, pointed, plano-convex, shorter than the 3 — 6 strongly hispid bristles. 
(S. validus, Vahl.) — Varies, with the broader keeled and fimbriate bristles rather 
shorter than the round-obovate nut. — Fresh or brackish marshes and ponds, 
Florida, and northward. July- Sept. 
6. S. leptolepis. Culms 3-angled, leafy at the base (29 — 39 high) ; leaves 
long, sharply keeled, triangular-compressed near the obtuse curved apex, the 
immersed ones flat and pellucid; involucre slender (7! long), leaflike, with 
shorter ones at the divisions of the compound umbel; spikes single, oblong or 
cylindrical, many-flowered, acut; scales light brown, lanceolate-oblong, acute, 
smooth, membranaceous, mucronate, and, like the three obtuse anthers, finely 
spotted; style 3-parted; nut whitish, 3-angled, oblong-obovate, long-pointed, 
shorter than the 5 slender and minutely denticulate bristles. (S. maritimus, var. 
cylindricus, Torr.?) — Lakes and ponds, Middle Florida, and westward. Dr. 
Hale. September. i 
§2. Culms jointed, leafy throughout: umbel terminal: involucre 2- several-leaved, 
spreading. í 
* Bristles hispid downward. 
7. S. maritimus, L. Culm sharply 3-angled, rough above ; leaves longer 
than the culm, keeled; umbel simple, 1 — 3-rayed, bearing single or 2-3 spikes 
in a cluster, or the spikes all clustered and sessile ; involucre 2 — 4-leaved, much 
longer than thé umbel ; spikes large, ovate or oblong-ovate, dull brown; scales 
thin, ovate, pubescent, tipped with a spreading awn; nut round-obovate, plano- 
convex or lenticular, smooth and shining, twice the length of the 4 weak — 
— Saline marshes, Florida, and northward. Aug. and Sept.— Culms 2° se 
high. Spikes 6-10" long, 4” in diameter. 
8. S. polyphyllus, Vahl. Culm obtuse-angled, smooth; leaves long, 
rough on the margins ; umbel decompound, spreading ; spikes small, 3-8 in 3 
cluster, ovate, yellowish-brown ; scales ovate, mucronate, keeled ; bristles s 
| hispid near the summit, mostly tortuous, 2 — 3 times as long a8 the ps fi 
ES. ssed-3-angled pointed nut. (S. exaltatus, Pursh.) — Shady swap’, 
North Carolina, and northward. July. — Culm 2°- 5° high. Spikes 1” ong: 
. S. divaricatus, Ell. Culm round-angled, many-jointed; leaves fiat, 
_ broadly linear; umbel large, widely spreading or drooping, decompound, 106% ——— 
