250 



CYPERACEAE (SEDGE FAMILY} 



age. 



the nerves impressed, 

 the perigynia. — la. to 



526. C. trich., 

 V. Dewevi. 



m 



52T. C. trich. 

 V. aristata. 



528. C. riparia. 



smooth, thick in texture, becoming polished with 



scales sharp, mostly a little shorter than 

 Kan., and northwestw. Fig. 526. 



Var. aristata (R. Br.) Bailey. Mostly stouter ; leaves 

 4-10 mm. wide, more or less hairy on the under surface 

 and sheaths; perigynia lance-ovoid, smooth, the teeth 

 longer and more spreading ; scales long and sharp. ( C. 

 aristata R. Br.) — Ont. to Sask. and B. C, s. to N. Y., 

 Mich.. Wise, Neb., etc. Fig. 527. Var. imberbis Gray. 

 Sheaths glabi'ous. — Ont. to N. Dak. and Mo. 



159. C. riparia ^V. Curtis. Very large and stout, 

 0.6-1.3 ra. high, stoloniferous ; Z^ares 0.5-1.5 cm. broad, flat, rough, 

 glaucous, much longer than the sharply angled 

 culm ; spikes 2-4, scattered and all more or less 

 peduncled, the lowestoften very long-stalked, vary- 

 ing from almost globular to slender-cylindric, 2-10 cm. 

 erect or the lower somewhat drooping, loo.sely 

 flowered below ; perigynia lance-ovoid, cori- 

 aceous, rather lightly many-nerved, the beak 

 short and thick; scales varying from blunt to 

 awned, shorter or longer than the perigynia. 

 — Swamps and wet shores, N. B. to Man., 

 and southw. May-July. (Eu.) Fig. 528. 



160. C. ACUTiFoRMis Ehrh. Stout, 0.4- 

 1.2 m. high ; culm thick and sharp, mostly 

 smooth ; leaves broad, flat and glaucous, much 

 prolonged ; spikes 2-5, all but the uppermost peduncled, spread- 

 ing or drooping, narrowly cylindric, 2-5.5 cm. 

 long, loosely flowered below; perigynia ovoid, 

 very strongly many-nerved, the short beak 

 slightly toothed ; scales rough-awned and longer 

 than the perigynia. — Boggy meadow, New 

 Bedford, and formerly at Dorchester, Mass. 

 June, July. (Nat. from Eu.) Fig. 529. 



161. C. squarr5sa L. Caespitose, 3-9dm. high 

 angled, more or le.ss rough above ; leaves 

 2.5-6 mm. broad, weak, roughish, exceeding 

 the culm ; bracts slender, elongate ; spikes 

 1-4, thick, the terminal always two thirds 

 pistillate or more, the remainder more or less 

 stalked, erect or slightly nodding, globular or short-cylindric, 



1.5-3 cm. long, 1.5-2 cm. thick, brown, 

 exceedingly densely flowered ; perigiinia 

 squarrose, the beak rough ; scale short 

 and usually hidden. — Swamps and wet 

 woods, w. N. E. to Neb., and southw., 

 local. June-Sept. Fig. 530. 



162. C. typhinoides Schwein. Coarser, 

 the glaucous or pale leaves 0.5-1 cm. broad ; 

 spikes 1.5-5 cm. long, 1-2.2 cm. thick, pale 

 brown ; perigynia less .squarrose, the beaks 

 ascending. — Meadows and alluvial woods, 

 w. Que. and w. N. E. to la. and southw. 

 June-Oct. Fig. 531. 



163. C. Frdnkii Kunth. Stout and very 

 leafy, 5-8 dm. high ; culm obtusely angled, 

 very smooth ; leaves 4-9 mm. broad, rough 

 on the nerves, the upper and the bracts 



very much longer than the culm ; terminal spike often pis- 

 tillate at top ; (jther spikes 3-7, the uppermost sessile on the 



long. 



529. C. acutiformis. 



culm sharply 



530. C. squarrosa. 



5.31. C. typhinoides. 



.'>i2. C. Frankii. 



