CYPEKACE.E. (SEDGE FAMILY.) 535 



terete, 10- 12-flowei-ed ; scales oblong, obtuse, faintly nerved, appressed ; nut 

 oblong, conipressed-3-augled ; culms slender, obtuse-angled. — Swamps and 

 ditches. August -Sept. ® — Culm 2° -3° high. Spikelets 6" -8" long, 

 flexuous in fruit. 



16. C. distans, L. Umbel large, compound, 8- lO-rayed; spikelets fili- 

 form, 4"- 6" long, spreading, 8- lO-flowered ; scales oblong, obtuse, faintly 

 nerved, twice as long as the winged joints ; nut oblong, 3-angled ; culms 2° - 3° 

 high. — Wet pine woods, North Carolina. 



17. C. refraetus, Engelm. Umbels mostly simple, 3-9-rayed, 3' -9' 

 long ; spikes loose ; spikelets filiform, terete, 6- 10-flowered, 9"- 12" long, at 

 length refracted ; scales oblong, obtuse, about twice the length of the oblong 

 triquetrous nut and the winged joints ; culms slender, l°-2° high, commonly 

 exceeding the rough-edged leaves. — Georgia, Tennessee, and westward. 



* * Sjiikekts compressed, somewhat 2-ranked, mostly few and scattered on the 

 common rachis : perennials, with creeping tuberbearimj rootstocks : Jiowers 

 mostly abortive. 



18. C. eseulentus, L. Umbel mostly simple, erect, 5-6-rayed, shorter 

 than the 3-5-leaved involucre; spikelets linear, spreading, 1 2 - 24-fiowered, 

 the lower ones often clustered ; scales oblong, obtuse or short mucronate, 

 compressed-keeled, thin-margined, spreading at the apex, yellowish brown ; nut 

 oblong, triquetrous, acute. — Sandy soil near the coast, Florida, and north- 

 ward. July - Sept. — Culms 1° - 1|° high, acute-angled, longer than the erect 

 smooth leaves. Rays 2' -4' long. Spikelets 6" -8" long. Whole plant 

 yellowish. 



Var. macrostachyus, BcEckl. Larger (2^-3° high); spikelets longer 

 (1' long) and broader, 30-40 flowered; scales acute, rounded on the back. — 

 Coast of Florida, and westward. 



19. C. rotundus, L. Umbel simple or compound, 3-8-rayed, mostly 

 longer tliau the 3-leaved involucre ; spikes composed of 3-9 scattered linear 

 flat 20 - 30-tlowered spikelets; scales oblong, obtuse, appressed, 7-uerved on 

 the green keel, the membranaceous sides dark chestnut ; nut obovate ; culms 

 smooth, slender, longer than the broadly linear crowded spreading rough 

 leaves. — Sandy soil, along the coast. August -Sept. — Culm 9'- 18' high. 

 Rays slender, 2' -4' long. Spikelets i'- 1' long. 



2. Umbel compound : spikelets compressed, many-Jlowered, scattered in loose 

 spikes at the Jili form summit of the rays : sccdes thin, 5-uerved, separate: 

 joints of the I'achis slir/htly margined : stamens 2. 



20. C. Iria, L. Umbel 6- 8 rayed, erect, shorter than the 3-4-leaved 

 involucre; spikelets erect-spreading, oblong-linear, 12 -24 flowered ; scales 

 spreading, nearly orbicular, obtuse or emarginate, shortmucronate, .5-nerved 

 on the green keel, the thin whitish sides minutely pitted ; nut oblong-obovate, 

 abruptly-pointed; style very short; culms (1° high) slender, acute-angled, 

 longer than the smooth narrow leaves. — South Carolina (Ravenel), Mississippi 



(Tracey). Probablv introduced. 



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