Carex. CYPERACEiE. 373 



B. Spikelets aggregated, androgynous, sessile. Stigmas 2. 



* Spikckts sterile at the summit, 



7. Carex disperma, Dew. Two-seeded Sedge. 



Spikelets mostly 3, rather remote, usually 2-flovvcred, llic lowest one bracleate ; pcrigynium 

 ovate, rather obtuse, nerved, plano-convex, rough on the margin, entire at the point, twice as 

 long as the ovate-carinale somewhat mucronatc scale. — Dew. Car. I. c. 8. p. 26G. t. A.f. 3 ; 

 Scfnvcin. (J- Torr. I. c. p. 303 ; Beck, hoi. p. 432 ; Kunlh, cnum. 2. p. 405. 



Culm 6-12 inches high, triquetrous, rough above, leafy below. Leaves narrow, mostly 

 shorter than the culm. Spikes sometimes 2, rarely 4, mostly with only 2 fertile flowers. 

 Bract of the lowest spikes often with a long slender point. Sterile scales lanceolate, whitish ; 

 the fertile broadly ovate, scarious, rather obtuse. Perigynium small, slightly narrowed above 

 but scarcely acute, with a sharp rough margin, tumid in front, a little spreading. 



Sphagnous swamps ; frequent on mountains. Fl. June. Fr. July. Dr. Boolt thinks this 

 species is hardly distinct from C. loliaceu of Europe. 



8. Carex ciiordorhiza, Ehrh. Long-rooted Sedge. 



Culm compressed-terete ; spikelets in an ovoid head ; perigynium ovate, acuminate, striate, 

 sliglitly 2-toolhed at the point, a little longer than the ovate acute scale. — " Ehrh. phyt. no. 

 77 ;" Schk. Car. t. li. /. 31 ; Gray, Gram. <^ Cyp. part 2. no. 143 ; Torr. Cyp. p. 388 ; 

 Kunth, enum. 2. p. 369 ; Boott in Hook. fl. Bor. Am. 2. p. 211. 



Rhizoma creeping and branching in sphagnum, throwing up slender culms which are 6-18 

 inches high. Leaves of the culm short, appressed ; those of the sterile shoots much longer. 

 Cluster or head of spikelets about three fourths of an inch long, with a short ovate-subulate 

 bract at the base. Scales concave, appressed, brown. Perigynium plano-convex, very tumid 

 in front, thick and somewhat spongy, smooth. Achenium obovatc, compressed, obtuse, 

 puncticulate, crowned with the ri^id style. 



Sphagnous swamps. Oneida county {Dr. Gray and Dr. Knieskern). Fl. May. Fr. June. 

 A native also of the northern parts of Europe. 



9. Carex cephalophora, MuJil. Oval-headed Sedge. 



Culm triangular with convex sides, rough on the angles near the summit ; spikelets ag- 

 gregated in an oval head ; perigynium ovate, compressed, acute, the margin rough towards 

 the summit, about as long as the ovate mucronatc or somewhat awned scale. — Muhl. in Willd. 

 sp. 4. p. 220 ; Schk. Car. t. Hhh. /. 153 ; Muhl. gram. p. 118 ; Ell. sk. 2. ;?. 516 ; Dew. 

 Car. I. c. 9. p. 269 ; Schwein. ^ Torr. I. c. p. 300 ; Beck, bat. p. 431 ; Darlingt. jl. Cest. 

 p. 27 ; Kunth, enum. 2. p. 387. 



Whole plant pale green. Culm usually 1 - 2 feet liigh, naked except towards. the base, 

 erect or reclining, rigid, striate. Spikelets collected into a dense head of a more or less 

 elliptical or ovoid shape, with one or two slender subulate bracts at the base. Scales carinate, 



