Oraam 155.— OYPEEACB^ 733 



0. MISTMBS. Invol. of 1 or 2 Its. Spikes 1 or 2, 10 to 12-flowered ; glumes 

 loosely imbricated, acute ; stam. 1. — Culm and Ivs. setaceous. H.J. (Torr.) 



3 C. Gatdsii Torr. Culm 8 to 12' high, slender, obtusely 3-angled; umbel of 6 

 to 8 distinct, very unequal rays ; spikes aitemate, rather remote, linear-lanceolate, 

 10 to 12-flowered, the lowest compound; scaies acute, loose, paU straw-yeUmo ; 

 etam. 2; sty. deeply 2-cleft; ach. obovate, obtuse, duU, dark gray. — Near Mobile, 

 Ala. (Grates, in Torr. Cyp.). Plant pale green. Invol. about S-leaved. 



4 C. flav^scena L. Culm 4 to 10' high, leafy below ; umhel of 2 to i short rays; 

 spikes linear, obtusish, 15 to 20 or 30-flowered; glumes obtuse, straw-color, broad- 

 ovate, 1-veined; stam. 3 ; sty. deeply 2-cleft; ach. suborbioular, dark brown, shin- 

 ing. — Marshy grounds, U. S., common in Penn. (Jackson). Lvs. about as high as 

 the culms. Spikes 5 to 9" long, 1^'' wide, iu crowded fascicles of 3 to 6 on each 

 short racliis. Aug. 



5 C. Cavicdmus Mx. Culm 1 to 3f high, 3-angled ; invoL 3 to 5-leaved, very 

 long ; umbel somewhat compound, of many (4 to 1) spreading rays ; spikes nume- 

 rous, lance-linear, divaricate, loosely 12 to 30-flowered; gimmes very obtuse, brown- 

 ish yellow, green and 3-veined on the keel, with a broad, white-scarious margin ; 

 stam. 3 ; sty. short, 2-oleft ; ach. obovate, blackish.^ — Bogs, also iu dry soils, Va. 

 to-Fla. Spikelets 1 to 10" long. Glumes somewhat truncate and emarginate. 

 May — Sept. 



6 C. artioulatus L. Jointed Sedge. Culm 2 to 6f high, with internal joints, 

 and several leafless sheaths towards the base ; lvs. none or sheath-Uke ; umbel 

 compound, loose, with about 5 rays ; invol. 2 or 3-leaved, short ; spilces linear- 

 subulate, alternate, 14 to 2p-flowered; glumes lanceolate, obtusiah, with a green 

 keel, membranous sides, white, with red dots ; stam. 3 ; sty. 3-oleft ; aoh. acutely 

 3-angled. — River swamps, S. States. Rt. jointed, creeping. Jn. — Aug. 



7 C. enithrorhizos Muhl. Culm 2 — 3f liigh, obtusely triquetrous, longer than the 

 loaves; umbel compound; rays 5 — 9, 3 — 4' long, each with 3 — 4 sessile clusters; 

 sheaths entire ; spikelets very numerous, 6" long, crowded and spreading in the 

 oblong subsessile (lieads) clusters, a little flattened, about 13-fiowered ; outer 

 glumes mucronate, closely imbricated, chestnut-brown, veinless and shining, the 

 inner ones entirely free from the rachis ; sta. 3 ; aoh. smooth and shining, much 

 shorter than the glume. — Tfet grounds Penn. and Southern States. 



8 C. H^dra Mx. Nutt Grass. Culm 6 to 12' to 2f high, 3-angled; lvs. shorter 

 than the culm ; umbel simple, 3 or 4-rayed, rays nearly as long as the involucre ; 

 spikes linear, alternate and 2-rowed on the raehis, 14 to 24-flowered; glv/mes 

 ovale, veinless, acute, separate at tlio tips, of u. fine purple brovm; stam. 3; sty. 

 3-cleft| much oxserted ; ach. 3-angled. — Sandy fields, Va. to Fla. and La. Vray 

 troublesome in cotton fields. Rhizomes creeping and branching extensively, 

 bearing tubers. Spikes 6 to 12" long. Apr. — Jl. 



9 C. phymatddes Muhl. Culm 1 — 2f high, 3-angled, striate; lvs. 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, involu- 

 celsO; spikelets 12 — 2p-fiowcred, 6 — 8" long, the lowest generally fasciculate ; 

 glumes veiny, yellowish. — 71 Moist fields, N. Y. to "Wis. and tf. Statea RhizomeB 

 creopiag, bearing small, round tubers at the ends. May — Aug. 



10 C. dissitifl6rua Ton-. Culms slender, tumid at the base, 1 to 2f high ; Its. 

 narrow, nearly radical; umbel 3 to 5-rayed, suberect, half as long as the involu- 

 cre ; spilces remotely altemaie, subdislychous on the slender rays, teretish, slender, 

 5 to 7-flowered, 6" to 1' long; glumes lance-oblong, acute; ach. brown, 3-angled. 

 — E. Tenn. ? to La. Plant slender, erect Bays of the umbel 1 to 3' long. 

 Spilces divaricate and reflexed. Aug. 



11 C. Michauxianiis Schultes. Culm acutely triangular ; umbel compound, with 

 short rays ; spikelets 6 — ^-flowered, the lower ones compound ; rachis very broad, 

 easily separating at the joints; ova. ovoid-triangular, enfolded by the interior, 

 adnate scales. — (J) Brackisli swamps, generally near tho sea, Middle and Southern 

 States. Stem 12 — 15' high, reddened at the base, longer than tho leaves. Spike- 

 lets 9" long, 7 — 9-flowered. 



12 C. tetr^gonuB Ell. Culm 2 to 3f high; lvs. shorter, clianneled, serrulate on 

 tlie margins and keel; umbel many-rayed, involuoels none; clusters oblong-cylin- 



