530 CYPERACILE. (SEDGE FAMILY.) 



bracts long and leaf-like, with very short sheathing bases, much exceeding 1he 

 culm (about equal to it in No. 106) : staminate sj>ikes 1-5 



* Perigynia with a very short and thick beak, and with short and thick slightly 



spreading teeth. — Lacustres. 



106. C striata, Michx. (not of ed. 1.) Sterile spikes 2-3, the upper- 

 most stalked ; fertile spikes 1-2, oblong, erect, remote, on very short stalks ; peri- 

 gynia ovoid, abruptly contracted into a slightly serrulate beak, longer than the point- 

 ed purple scale. (C. polymorphs,, ed. 1.) — Wet places, New Jersey to Vir- 

 ginia, and southward. 



107. C. lacustris, Willd. Sterile spikes 2-5, the uppermost stalked; 

 fertile spikes 2 - 3, oblong-cylindrical, stout, erect, remote, nearly sessile, or the low- 

 est on a short stalk ; perigynia oblong, but little exceeding the lanceolate awned 

 scale; culm sharply triangular, rough; sheaths very short, smooth. (C. riparia, 

 Muhl., not of Curtis.) — Swamps and borders of lakes and rivers; common. — 

 A robust species, 3° - 5° high, with leaves £' - j|' wide. 



# * Perigynia with an elongated tapering beak, and long widely spreading or recur t,ed 



sharp and sjiine-like teeth. — AristAt^e. 

 -<- Staminate spikes 2-5, some occasionally bearing a fexo fertile flowers. 



108. C. arist-i&ta, 11. Brown. Fertile spikes 2-4, cylindrical, erect, re- 

 mote, the lower on partly exserted short stalks ; perigynia tapering from an ovoid 

 base into a dee J >ly 2forked beak, longer than the ovate-lanceolate awned scale 

 culm smooth ; sheaths and under surface of the leaves pubescent. (C. atherdd.es 

 Spreng.) — Lake shores and river-banks, N. New York to Michigan, and north- 

 westward. — Culm 2° - 3 C high : leaves 2" - 3" wide. Fertile spikes 2' - 3' long, 

 often rather loosely flowered towards the base. 



109. C tl'iclBOC&rpa, Muhl. Fertile spikes 2 -3, oblong-cylindrical, erect, 



remote, one of them sometimes staminate at the apex, the lower on exserted 

 stalks, rather loosely flowered towards the base; perigynia very hairy, shaped as 

 the last, longer than the ovate taper-pointed light-brown scale ; culm sharply 

 triangular, smooth except near the top, sheaths and under surface of the leaves 

 smooth. (C. striata, cd. 1, not of Michx.) — Marshes and lakes; common, es- 

 pecially northward. 



i- +- Staminate spike solitary, with a filiform bract, occasionally bearing a few 

 fertile flowers towards the apex or base : fertile spikes 3-5, cylindrical, dense- 

 ly flowered, on long exserted and at length drooping stalks : perigynia widely 

 spreading, reflexed at maturity. 



110. C C©8il«sa, Boott. Fertile spikes large (l|'-2f long, and J'-f 

 wide), the lowest sometimes very remote; perigynia tapering from a stalked ovoid- 

 triangular base into a long deeply 2-forked beak, the sharp elongated teeth widely spread- 

 ing or somewhat recurved ; scales lanceolate with a long bristle-shaped awn 

 shorter than the mature fruit ; culm rough and triquetrous. (C. furcata, Ell., 

 not of Lapeyr. C. Pseudo-Cyperus, Sclav, fr Torr., Dew., Spc, in part, not of L.) 

 — Wet places; rather common. — A robust species 2° -3° high, formerly con- 

 founded with the next, which it greatly resembles; but it differs especially in 

 the larger fertile spikes, longer beak of the fruit, and the longer, smooth and 

 widely-spreading teeth, giving to the spikes a comose or bristly appearance. 



