CYPERACEAE (SEDGE FAMILY) 



255 



552. C rotundata 



551 c Grahami 



s. N. B. and centr. Me. July-Sept. FIG. 550. Apparently 

 hybridizes with C. vesicaria. 



180. C. Grahami Boott. Slender, 2-7 dm. high; leaves 

 flat, 1.5-3 mm. wide ; staminate spikes 1-3 ; pistillate 1-3, the 

 lowest mostly short-peduncled, slightly spreading or ascending, 

 1.2-1.8 cm. long, 6-10 mm. thick ; perigynia straw-colored, thin, 

 ovoid, 4-5 mm. long, few-nerved, with a slender 

 subentire beak, ascending, twice as long as the 

 blunt purple scale. Margin of a pond, Mt. 

 Katahdin, Me. July, Aug. (Scotland.) FIG. 

 551. Much of the American material previ- 

 ously referred to this species is apparently a 

 hybrid between C. saxatilis, var. miliaris and 

 forms of C. vesicaria. (C. miliaris, var. awmz 

 Bailey ; C. Eaeana Britton, not Boott ; C. main- 

 ensis Porter.) 



181. C. rotundata Wahlenb. Slender, 6 dm. 

 or less high; leaves soon becoming involute; 

 staminate spike 1 (rarely 2 or 3); pistillate 

 l or 2 ' sessile, short and compact, 8-13 mm. 

 long, 6-8 mm. thick, the lower subtended by a 

 divergent bract (4-5 cm. long*) ; perigynia pale or ferruginous, plump, sub- 

 globose-ovoid, few-nerved, about 3 mm. long, abruptly short-beaked, the beak 

 entire or short-toothed, one half longer than the purplish scales. Outlet of 

 Moosehead L., Me. Aug. (Greenl., n. Eu.) FIG. 552. 



182. C. vesicaria L. Comparatively slender, 0.4-1 m. high ; the culms 

 sharply angled and generally harsh above, usually overtopped by the bracts; 

 leaves 4-7 mm. wide, loosely ascending or spreading ; staminate 

 spikes mostly 2 or 3, peduncled ; pistillate spikes 2-3, remote, 

 sessile or short-peduncled, cylindric, 2-7 cm. long, 

 1-1.5 cm. thick; perigynia slightly turgid, ovoid 

 to oblong-conic, gradually tapering to the beak, 

 when mature 7-9 mm. long, twice exceeding the 

 ovate-lanceolate acute or acuminate scales. Mead- 

 ows and low ground, e. Que. to B. C., s. to Pa., 

 the Great Lake region, etc. June-Aug. (Eu.) 

 FIG. 553. A very variable northern species, pass- 

 in & freely with us into the following arbitrarily 

 distinguished tendencies. Var. MONILE (Tuckerm.) 

 Fernald. Leaves 2-5 mm. wide ; pistillate spikes as in the 

 species ; perigynia more turgid, roundish-ovoid, about 6 mm. 

 long, rather abruptly tapering to the beak. (C. 

 monile Tuckerm.) Nfd. to Sask., Ky., and Mo., 

 generally common. FIG. 554. Var. JEJUNA Fer- 

 nald. Smaller and more slender; pistillate spikes 

 thinner, 5-8 mm. thick. Common north w. Var. 

 DISTENTA Fries. Slender ; pistillate spikes I or 2, 

 short and thick, 1-2.5 cm. long, 1-1.5 cm. thick; 

 perigynia subglobose or ovoid, abruptly beaked. Local, Nfd. and 

 Que. to Me. and Vt. Var. RAEANA (Boott) Fernald. Very slen- 

 der ; leaves 2 mm. wide, tending to become involute at tip ; pis- 

 tillate spikes slender, 4-8 mm. thick; perigynia scarcely inflated, 

 narrow and 'elongate. Local, Que. to Athabasca, s. to Me. 

 FIG. 555. 



.183. C. rostrata Stokes. Culm 0.3-1 m. high, rather stout, 

 ^^ c ^^ s ^ an( ^ s P on gy at base, generally smooth and bluntly angled 

 above ; leaves elongated, flat, usually equaling or exceeding the 

 culms, pale green or glaucous, 0.2-1 cm. wide, prominently nodulose, espe- 

 cially after drying ; staminate inflorescence peduncled, of 2-4 distinct spikes ; 

 pistillate spikes mostly 2-4, sessile or the lower peduncled, cylindric, dense, 



553 c vesicaria. 



555 



v Kaesma ' 



