CYPERACE^. (sedge FAMILY.) 507 



* Spikelets approximate or crowded on all sides of the common rachis, forming ohlong 

 or cylindrical spikes. 



7. C. strigOSUS, L. Umbel large, 4 - 8-rayed, simple or compound, much 

 shorter than the involucre ; involucels bristly, shorter than the dense oblong 

 spikes; spikelets yellowish, linear, acute, compressed, 6 - 10-flowered ; scales 

 somewhat scattered on the very slender rachis, oblong-lanceolate, acute, closely 

 appresscd, much longer than the linear-oblong acute minutely dotted dull nut ; 

 culms (l°-3° high) tumid at the base, as long as the broadly linear leaves. — 

 Swamps and damp soil, Florida, and northward. July- Sept. — Rays 4' -G' 

 long. Spikelets j' - |' long. Sheath of the rays bristle-pointed. 



8. C. Stenolepis, Torr. Umbel simple or compound, 6 - 9-rayed, shorter 

 than the 3 - 6-leaved involucre ; sheaths of the rays truncate ; involucels bristly, 

 shorter than the ovate compact spikes ; spikelets yellowish, linear, acute, com- 

 pressed, 5 - 8-_flowered ; scales linear-lanceolate, acute, involute, spreading, much 

 longer than the oblong-linear acute dull and minutely pitted nut; culms smooth 

 (2° -3° high); leaves very rough on the margins, whitish beneath. — Swamps 

 and wet places, Florida to North Carolina. Aug. and Sept. — Stem rather 

 slender, longer than the leaves. Spikelets 6"- 8" long. 



9. C Michauxianus, Schultes. Umbel compound, 4-6-rayed; rays 

 short with the sheaths pointed ; spikes loose, mostly shorter than the leafy in- 

 volucels ; spikelets spreading or reflexed, linear-subulate, terete, 10-12-flow- 

 ered ; scales scattered on the short-jointed broadly-winged rachis, oblong, obtuse, 

 faintly nerved, appressed ; nut oblong, compressed-3-angled ; culms slender, 

 obtuse-angled; involucre 4 -6-leaved. (C. speciosus, FaA/?) — Swamps and 

 ditches, Florida, and northward. Aug. and Sept. {£) — Culm 2° - 3° high. 

 Spikelets 6" - 8" long, flexuous in fruit. 



Var. ? elongatUS, Torr. " Culm tall and slender ; rays elongated ; spike- 

 lets subulate, obtusely quadrangular ; scales lanceolate, acute." Torr. — North 

 Carolina, Curtis. — Rays 3' - 5' long. Spikelets crowded, 6 - 8-flowered. 



10. C. tetragonus, Ell. Umbel simple or compound, of 6-12 slender 

 rays; spikes cylindrical, loose; spikelets horizontal, short (2"-3" long), oblong, 

 4-angled, 4 - 6-flowered ; scales ovate, mucronate, appressed, 9 - 1 1 -nerved, twice 

 as long as the oblong dull nut; culms mostly slender, 1° -2° high, acutely 

 rough-angled at the summit, as long as the green rough-edged leaves ; invo- 

 lucre many-leaved. — Dry sandy soil, along the coast, Florida to North Caro- 

 lina. Aug. and Sept. U — Spikes 1'- \^' long, 5" wide, those on the longer 

 rays commonly compound. Rays 3' - 5' long. Joints of the rachis broadly 

 winged. 



11. C ligularis, L. Umbel compound, of 4-6 rays ; spikes ovate or ob- 

 long, d^ense ; spikelets spreading (4" long), linear-lanceolate, compressed-4-an- 

 gled, 8 - 10-flowered, acute ; scales oblong-ovate, acute, spreading, 9 - 11-nerved, 

 thrice the length of the oblong-obovate pointed blackish nut; culms obtuse- 

 angled, shorter than the (3° - 4° long) whitish long-tapering leaves. — Sandy 

 shores at Key West. Oct. y. — Culm 2° - 3° high. Leaves rough-edged. 

 Rays 2' - 3' long. Spikelets light brown. Joints of the rachis broadly winged. 



