CYPERACEH. (SEDGE FAMILY.) ; 509 
on the back, thrice the length of the linear-oblong dull nut; rhizoma creeping, 
. bearing tuber-like buds; culms stout (39 — 59 high), tumid at the sheathed base. 
— Marshes near the coast, Florida to South Carolina. Aug.-Sept. } — 
Flowers mostly abortive. 
* * Culms 3-angled, knotless : involucre leafy : nut obovate. 
17. C. Haspan, L. Umbel many-rayed, decompound, spreading, the fili- 
form rays mostly longer than the 2-leaved involucre; spikelets small (4! — 5" 
long), 3-5 in a cluster, linear, acute, 20 —40-flowered ; scales light reddish- 
brown, very small, oblong, mucronate, 3-nerved, free at the apex; nut white, 
round-obovate, granular-roughened ; culms tender, sharply angled ; leaves lin- 
ear, smooth, shorter than the culms (1? - 139), often reduced to membranaceous 
sheaths. (C. gracilis, Muhl. C. leptos, Schultes.) — Ponds and ditches, Flor- 
ida to North Carolina, and westward. July — Sept. 
18. C. dentatus, Torr. Umbel compound, erect, 4- imas shorter than 
the 3— 4-leaved involucre ; spikelets 3—5 in a cluster (3" - 7" long), ovate-ob- 
ong, obtuse, flat, 12 — 30-flowered ; scales ovate, acute, compressed, 7-nerved on 
the green keel, membranaceous on the reddish brown sides, spreading at the 
apex; nut minute, round-obovate, whitish ; rhizoma creeping, bearing tubers ; 
culms slender (1° high), obtuse-angled, longer than the rigid keeled leaves, — 
Sandy swamps and tapa South Sanne ich and northward. npa P 
— Raysi'-2'long.  — 
19. C. Lecontii, Tec Umbel debel breit, 6- dise 2 
than the 3-leaved involucre ; spikelets. commonly three in a cluster, oblong or 
linear-oblong, obtuse, flat, 30-70-flowered (}/- 1'long); scales closely imbri- 
cated, ovate, obtuse, compressed, yellowish, faintly 7-nerved, appressed at the 
apex; nut minute, round-obovate, blackish ; culms rigid, obtuse-angled, as long 
as the rigid leaves. — Low sandy places along the coast, East and West Florida. 
July-Sept. Y — — Rhizoma creeping. Culms 6'-12'high. Rays 2'-6' long. 
Rachis with very short joints. Whole plant pale straw-color. 
4. Gromerati. Umbel simple or compound: spikelets many-flowered, compressed, 
numerous in a cluster, forming more or less dense heads at the summit of the com- 
mon and partial rays: rachis wingless: stamen solitary. 
* Umbel compound: spikelets ovate or oblong, flat: scales 3-nerved, concave on the 
back, acute : nut minute, lanceolate or oblong. 
20. C. virens, Michx. Umbel spreading, compound, Muse; invo- 
lucre 4 - 6-leaved, many times longer than the umbel; spikelets (4^ — 6" long, 
and about 20 in a cluster) oblong, 30 — 40-flowered, pale green ; scales oblong- 
lanceolate, straight; nut lanceolate, acute at each end; culms stout (2°-4° 
high), rough-angled above; leaves broad, elongated, reticulated, rough on the 
margins. Miry places, Florida to North Carolina. July- Sept. Y a 
. palè da oup 3! - 4! e rici M turning yellowish. 
dee 
