250 



CYPERACEAE (SEDGE FAMILY) 



526. C. trich. 

 v. Deweyi. 



527. C. trich., 

 v. aristata. 



smooth, thick in texture, becoming polished with age, the nerves impressed ,- 

 scales sharp, mostly a little shorter than the perigynia. la. to 

 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 glabrous. Ont. to N. Dak. and Mo. 



159. C. riparia W. Curtis. Very large and stout, 

 0.6-1.3 m. high, stoloniferous ; leaves 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 lowest often very long-stalked, vary- 

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

 erect or the lower somewhat drooping, loosely 

 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. (En.) FIG. 528. 

 160. C. ACUTIFORMIS Ehrh. Stout, 0.4- 



C. riparia. 1>2 m - ^S 11 > culm tllick 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. 529 - c - acutiformis. 

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



161. C. squarrbsa L. Caespitose, 3-9 dm. high ; culm sharply 

 angled, more or less 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 ; perigynia 



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. Frankii Kunth. Stout and very 

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



531. C typhinoides. vei T 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 ; other spikes 3-7, the uppermost sessile on the 532. c. Frankii. 



C. squarrosa. 



