514 CYPERACE.fi. (SEDGE FAMILY.) 



pressed leaves; spikes aggregated into an orold head; perigyn'a o^ate, a little 

 longer than tlie scale. Cold peat-bogs, New York to Wisconsin, and north- 

 ward. (Eu.) 



28. C. tcnclla, Schk. Spikes 2-4, very small, remote, with commonly 2 

 fertile flowers ; pcrigynia ovate, twice as long as the scale. (C. loliacea, Schk. 

 supp., not of L. C. dispcrma, Dew. C. gracilis, cd. I, not of Ehrh.) Cold 

 swamps, New England to Pcnn., Wisconsin, and northward. A slender spe- 

 cies, 6' -12' high, with long grassy leaves, growing in tufts. (Eu.) 



3. Spikes pistillate above, staminate at 1/te base. 



* Spikes roundish-oroid, rather small, more or less distant on the zigzag axis (closely 

 aggregated in No. 30) : perigynia plano-convex, smooth, pale green, becoming 

 whitish or silvery: scales white and membranaceous ; the bracts resembling 

 them, or prolonged and bristle-shaped. CANESCENTES. 



- Perigynia somewhat thickened and leathery, distinctly nerved, with a smooth or mi- 

 nutely serrulate short point, entire or slightly notched at the apex. 



29. C. tl'ispcrnm, Dew. Spikes 2-3, very small, with about 3 fertile 

 flowers, remote, the lamest with a long bract ; perigynia oblong, with numerous 

 slender nerves, longer than the scale. Cold swamps and woods, especially on 

 mountains, New England to Pennsylvania, Michigan, and northward. Re- 

 sembling the last, but with larger spikes and fruit, and weak spreading culms, 

 l-2 long. 



30. C. tClllli flora, Wahl. Spikes 3, few-flowered, closely approximated; 

 perigynia oi-ate-oblong, about the length of the broadly ovate scale. Cold swamps, 

 N. New England to Wisconsin, and northward. (Eu.) 



31. C. CSIIICSCCBIS, L. (in part). Pale or glaucous; spikes 5-7 (aboiti 

 12 - 20-Jioicered) , the 2-3 upper approximated, the rest all distinct and the lower- 

 most remote; perigynia ovate, about the length of the pointed scale. (C. curta 

 Good. C. Ilichardi, Miclix.) Marshes and wet meadows ; common, especially 

 northward. (Eu.) 



Var. vitilis is. a more slender and weak form, not glaucous, with smaller 

 nn<l roundish G - 15-flowercd spikes, the more pointed perigynia spreading (and 

 often tawny) at maturity: perhaps a good species. (Var. alpicola and var. 

 gph;crosta<'hya, ed. 1. C. tcnella, Ehrh. C. Persoonii, Si*ber. C. vitilis, />/. 

 I'. (Irhhardi, llopfte. C. sphserostachya and C. Buckleyi, Dew.} On moun- 

 tains, and high northward. (Eu.) 



- - Perigynia thickened only at the base, olwunly nerved on t/ie outer side, tapering 

 into a rough 2-toollied In ak. 



32. C. Dcweyana, Schw. Spikes about 4 ; the 2 uppermost approxi- 

 mate, the others listinct, the lowest long-bract ed ; perigynia oblong-lanceolate, 

 rather longer than the sharply pointed or awned scale. Copses, New England 

 to Wisconsin, and r.c.rthwiird. See Addend. 



* # Spikes ovoid o* olioroid. more or less clustered ; perigynia cnncare-com'ex, com- 

 prexud, ni<ifl/in(d or iringed, nerved, with a rough 2-toothcd beak, often tawny 

 at maturity: scales tawny or white, awnless : bracts bristle-shaped, usually 

 falling before the maturity of the spikes ( ; n No. 34 persistent, -wry long and 

 leaf-like.) 



