566 CLX. CYPERACE^. Cyperus. 



§. 1. Style 2-cleft. Achenium compressed-lenticular. 



1. C. FLAVESCENS. YclloW Scdg€. 



St. leafy, triquetrous ; spikelcts linear-lanceolate, 15 — 20-flowered, in fasci- 

 cles of 3 or 4 ; Invol. of 3, unequal leaves, longer than the spikes ; glumes ovate, 

 obtuse ; styk 2-cleft ; ach. mucronate, somewhat rugose, dark brown. — % Marshy 

 grounds, U. s., not common. Stems and leaves about 8' high, the former with 

 yellowish-green spikes in a terminal umbel with unequal rays. Aug., Sept. 



2. C. DiANDRUS. Torr. Diandrous Sedge 



St. slender, reclining ; umbels sessile, 1 — 2-rayed ; raijs unequal ; invol. 

 3-leaved, the 2 outer leaves very long ; spikelets oblong-lanceolate, flat, 14 — 16- 

 flowered, collected into capitate fascicles ; glumes acute ; sta. 2 ; 5/?/. 2-cleft ; ach. 

 compressed. — Marshes, N. Eng. ! Mid. and W. States. Stem" 6 — 12' long. 

 Umbel somewhat paniculate. Glumes chestnut-colored. A delicately beauti- 

 ful sedge. 



/?. 1 castaneus. Torr. (C. castaneus. Bw.) Rays very short ; glumes close, 

 subcoriaceous, green on the back. — N. Eng. ! Stems 4—8' high. 



3. C. NuTTALLii. Torr. NuttalVs Sedge. 



St. acutely triquetrous, leafy at base •' Ivs. narrow-linear, nearly as high 

 as the stem ; umbel loose, subsessile, about 3-rayed ; rays short ; invol. 4-leaved, 

 the 2 outer leaves very long ; spikelets very acute, linear-lanceolate, fasciculate, 

 brownish; ach. oblong-obtuse. — % Salt marshes, N. Eng. to La. Stems 6 — 12' 

 high, in dense tufts. Scales minutely 3-toothed. Stamens 2. 



4. C. TENELLUs. Liuu. 7 Torr. Slender Sedge. 



St. setaceous, very slender, 3 — 5' high ; Ivs. setaceous ; spikelets solitary, 

 lance-linear ; invol. mostly of one erect, setaceous leaf 1' in length ; scales 

 rather loose, 3-veined on the keel ; sta. 1 ; sty. 2-cleft ; ach. oblong-obovate, much 

 compressed, brown. — Monmouth Co., N. J., Dr. Cleaver, (Torr. Cyp., p. 258.) 



§ 2. Style 3-cleft. Achenia triangular. 

 * Spikelets alternate, in jyinnatiform, subdistichous spikes. 



5. C. STRiGosus. Bristle-spiked Galingale. 



St. triquetrous, leafy only at base ; Ivs. broad-linear, rough-margined, 

 about as long as the stem ; umbel with elongated rays and oblong, loose spikes ; 

 involur.els or setaceous ; spikelets numerous, linear-subulate, spreading hori- 

 zontally, 8-— 10-flowered, 7—9" long; invol. of about 6 leaves, the 2 outer ones 

 very long. — Wet grounds, U. S., frequent. Stem 1 — 2f high, bulbous at base. 

 Umbel yellowish. Sept. 



/?. Rays with setaceous involucels 1' long; spikelets very numerous, subulate, 

 3—4" long.— la. ! 



6. C. MicHAUXiANA. Schultes. (C. eruthrorhizos. Torr.') 



St. acutely triangular ; umbel compound, with sliort rays ; spikelets 6 — 9- 

 flowered, the lower ones compound ; rackis very broad, easily separating at the 

 joints ; ova. ovoid-triangular, enfolded by the interior, adnate scales. — Brack- 

 ish swamps, generally near the sea. Middle and Southern States. Stem 12 — 15" 

 high, reddened at the base, longer than the leaves. Spikelets 9" long, 7 — 9- 

 flowered. 



7. C. REPENs. Ell. (C. phymatodes. Muhl.) 



Rt. creeping, bearing small, round tubers at the extremities ; 5^. 1 — 2f high, 

 3-angled, striate; Ivs. subradical, as long as the stem; umbel 4— 6-rayed; rays 

 often branched, bearing 12 — 20 linear, obtuse spikelets somewhat in 2 rows; 

 sheaths obliquely truncate, involucels ; spikelcts 12 — 20-flowered, 6 — 8" long, 

 the lowest generally fasciculate ; glumes yellowish. — % Moist fields, N, Y. to 

 la. ! and S. States. Aug. 



8. C. sPECiosis. Vahl. Showy Sedge. 



St. acutely angled, about 3f high ;" Zz^s. deeply channeled, half as long 

 as the stem ; umbels compound, about 8-rayed, rays alternate, 1 — 3' long ; 

 ochrece ("sheaths) deeply 2-par:cd ; partial umbels with numerous, compound 

 spikes, mvolucoUate with .setaceous bracts; spikelcts umbellate. 5 — 8-flowered ; 

 sta. 3. — Wet places, Columbus, Ohio, Sullivant. 



