566 CLX. CYPERACE^E. CYPERUS. 



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



1. C. FLAVESCENS. ~Yellow Sedge. 



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

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

 obtuse ; style 2-cleft ; ach. mucronate, somewhat rugose, dark brown. 7|_ 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 ; rays 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 ; sty. 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 * 



0. 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. 7J. Salt marshes, N. Eng. to La. Stems 6 12' 

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



4. C. TENELLUS. Linn. 1 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. Gyp., p. 258.) 



2. Style 3-cleft. Achenia triangular. 

 * Spikelets alternate, in pinnatiform, 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 ; 

 involucels or setaceous ; spikelets numerous, linear-subulate, spreading hori- 

 zontally, 8 10-flowered, 7 9 7/ 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. 



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

 34" long. la. ! 



6. C. MICHAUXIANA. Schultes. (C. eruthrorhizos. Torr.) 



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

 flowered, the lower ones compound ; rachis 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 ; st. 1 2fhigh, 

 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 ; spikelets 12 20-flowered, 6 S" long, 

 the lowest generally fasciculate ; glumes yellowish. 1|. Moist fields, N. Y. to 

 la. ! and S. States. Aug. 



8. C. SPECIOSUS. Vahl. Showy Sedge. 



St. acutely angled, about 3f high ; Ivs. deeply channeled, half as long 

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

 ochrece (sheaths) deeply 2-parted; partial umbels with numerous, compound 

 spikes, mvolucellate with setaceous bracts ; spikelets umbellate. 5 8-flowered ; 

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



