CVPERACEAE (SEDGE EAMILYJ 



225 



mm- long), the upper subapproximate or scattered, the lowest very remote, 

 usually subtended by an elongate slender bract ; beak about \ as long as the 

 body of the perigynium, somewhat exceeding the ovate acumi- 

 nate or short-cuspidate pale scale. — llich open woods and banks, 

 Que. to B. C, s. to Pa., Mich., Wise, N. Mex., etc. May-Aug. 

 Fig. 889. 



36. C. tenuiflbra Wahlenb. Lax, the culms 2-6 dm. long, 

 mostly exceeding the very narrow (0.7-2 mm. broad) pale green 

 leaves ; spikes ,3-10-flowered ; peri- 

 gynia 1.5-1.7 mm. broad, with the 

 bluntish tips smooth or rarely with 390. c. tcnuiflom. 

 1 or 2 teeth, about equaled by the 

 ovate or , ovate-oblong white scale. — Bogs and wet 

 mossy woods, local, Hudson Bay to Man., s. to N. B., 

 Me., Mass., N. Y., Mich., Wise, and Minn. June, 

 Julj'. (Eu.) — Apparently hybridizes with 0. tri- 

 sperma in n. Me. Fig. 390. 



37. C. trispfirma Dewey. Culms almost filiform, 

 2-7 dm. long, usually much overtopping the soft 

 narrow (1-2 mm. wide) leaves; the 2 or 3 spikes 

 2-6-Jlowered ; the finely many-nerved beaked peri- 

 gynia 3.3-3.8 mm. long, 1.6-1.8 mm. 

 391. 0. trisperma. broad, slightly exceeding the ovate- 



oblong pale obtuse to mucronate- 

 acuminate scales. — Mossj- woods and bogs, Nfd. to Sask., s. to 

 Md., the Great Lakes, and Neb. June- Aug. Fig. 391. 



Var. Billingsii Knight. Leaves nearly setaceous, (>.Z-(i.b mm. 

 wide; the 1 or 2 spikes 1- or 2-fiowered ; perigynium 2.5-3.3 

 mm. long. — Boggy spots, local, N. S. and Me. to N. J. 



38. C. norv6gica Willd. Glaucous and freely stoloniferous ; 

 culms smooth and soft, 1-4.5 dm. high, mostly overtopping the 

 soft flat rather narrow (1-2.5 mm. broad) leaves ; inflorescence 

 1.5-5.5 cm. long, of 2-6 ovoid or thiek-cylindric spikes, the 

 lower 5-12 mm. long; perigynia faintly nerved, 2.5-3.3 mm. ^ 

 long, 1.6-2 mm. broad, conic-rostrate, usually abruptly contracted ' 

 to a substipitate base. — Damp, usually brackish soil, locally on the coast from 

 Me. northw. June-Aug. (Eu.) Fig. 392. 



X C. HELvoLA Blytt is a hybrid of this with no. 32, occurring in N. B. and 

 n. Eu. 



39. C. glareftsa Wahlenb. Culms acutely angled, mostly curved, scabrous at 

 tip, 1-3 dm. high, once and a half or twice exceeding the flaccid narrow blue-green 

 leaves; inflorescence narrowly ellipsoid or obovold, 0.7-2 cm. 

 long, with 2-4 appressed-ascending obovoid spikes, the lower 4-9 

 mm. long, the terminal larger, 6-11 mm. long ; perigynia fusi- 

 form, with narrow smooth beak, striate-nerved, 2.5-3 mm. long, 

 harely 1 mm. broad, exceeding the ferruginous or purplish white- 

 edged ovate acutish or obtuse scales. — Shores of the lower St. 

 Xiawrenoe, Que., and northw., local. June-Aug. (Eu.) 



Var. amphigena Femald. Perigynia broadly 

 ellipsoid, ovoid or. obovoid, 1.3-1.9 mm. long, 

 abruptly beaked. — Commoner, Arctic coast to 

 Que. and N. B. (Eurasia.) Fig. 393. 



40. C. tenfiUa Schkuhr. Exceedingly slender, 1-6 dm. high, in 

 loose tufts ; leaves flat, soft, ' and weak, mostly shorter than the 

 culm ; spikes' IS-Jlowered, or the terminal 4-6-flowered, scattered 

 on the upper part of the culm, the bracts obsolete or the lowest 

 present and very short ; perigynium very plump, finely nerved, the 

 minute beak entire, longer than the white scale, usually at length 

 splitting and exposing the dark achene. — Cold swamps and wet woods, Nfd. to 

 B. C, s. to N. J., Pa., Mich., Col., etc. May-Aug. (Eu.) Fig. 394. 



GBAY'S JttAIfUiL — 16- , 



C. norvegica. 



893. C. glareosa, 

 V. amphigena. 



C. tenella. 



