CYPERACEAE (SEDGE FAMILY) 



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. — Rich open woods and banks, 

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

 Fig. :^89. 



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. temiiiiora. 



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, 

 July. (Eu.) — Apparently hybridizes with C. tri- 

 sperm,a in n. Me. Fig. 390. 



37. C. trisplrma 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-b-Jlowered ; the finely maiiy-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- 

 acumiuate scales. — Mossy woods and bogs, Nfd. to Sask., s. to 

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



Var. Billingsii Knight. Leaves nearly setaceous, O.S^.^ mm. 

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

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



38. C. norvegica 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 thick-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. glarebsa Wahlenb. Culms acutely angled, mostly curved, scabrous at 

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

 leaves; inflorescence narrowly ellipsoid or obovoid, 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, 

 barely 1 mm. broad, exceeding \hQ ferruginous or purplish white- 

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

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



Var. amphigena Fernald. Perigynia broadly 

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

 abruptly beaked. — Commoner, Arctic coast to 

 Que. and N. B. (Eurasia.) Fig. 303. 



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

 loose tufts; leaves flat, soft, and we.ik, mostly shorter tlian the 

 culm ; spikes 1-^^-flotvered, 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.) Fio. 394. 



gray's manual — 16 



norvegica. 



93. C. glareosa, 

 V. amphigena. 



. C. tenella. 



