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. 0., 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 1.6-1.7 mm. broad, with the 

 bluntish tips smooth or rarely with 890. C. tenuiflora. 

 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 G. tri- 

 sperma in n. Me. FIG. 390. 



37. C. trispSrma Dewey. Culms almost filiform, 

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

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

 2-5-flowered ; the finely many-nerved beaked peri- 

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

 391. C. trisperma. broad, slightly exceeding the ovate- A 



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, 0.3-0.5 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. norvSgica 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 the 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 the ferruginous or purplish white- 

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

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



Var. amphfgena Fernald. Perigynia broadly 

 ellipsoid, ovoid or obovoid, 1.3-1.9 mm. long, 893. C. giareosa, 

 abruptly beaked. Commoner, Arctic coast to v. amphigena. 

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



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

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

 culm ; spikes 1-%-Jlowered, or the terminal 4-6-flowered, scattered 

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

 C tenella P resen t 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. 



GRAY'S MANUAL 16 



