CYPERACEAE (SEDGE FAMILY) 



23a 



79. C atrMa L., var. ovata (Rudge) Boott. Very slender but erect, 2-9 

 dm. high ; culm rather sharp, roughish above ; leaves narrow but flat, shorter 

 than the cuhn ; spikes 3-6, all but the terminal one on 

 slender stalks, drooping when mature, 1-2.5 cm. long, ellip- 

 soid or short cylindric, reddish-brown to purplish-black; 

 perigynia broadly ovate, thin and puncticulate, very short- 

 beaked, ihe orifice slightly notched ; scales blunt, thin- 

 margined, about as long as the perigynia. 

 ( C. atratiforinis Britton. ) — By streams 

 and in cold ravines, Nfd. to Athabasca, 

 locally s. to the mts. of n. N. E. June- 

 Aug. Fig. 429. 



80. C. polygama Schkuhr. Rather 

 slender but stiff, 2-9 dm. high ; culm 

 sharp, roughish above ; leaves very nar- 

 row, rough, mostly shorter than the 429. c. atrata, v. ovata. 

 culm ; spikes 2-7, the terminal rarely all 

 staminate, sessile and approximate or the lowest very short- 

 stalked, from globular to narrowly cylindric, 0.7-5 cm. long, 

 430. c. polygama. ^^^^' ^^'^*^^^ or variegated; perigynia elliptic and beakless, 

 whitish and granular, nearly nerveless, tlie orifice (^ntire; 

 staminate scales very long-lanceolate, the pistillate lance-ovate and very sharp, 

 conspicuously longer than the perigynia. (C. fusca Man. ed. 6, not All. ; 

 C. Buxbaumii Wahlenb.) — Bogs and wet shores, e. Que. to Alaska, 

 s. to Pa., Great Lake region, Mo., Utah, and Cal. ; and in the mts. 

 to N. C. May-.7uly. (Eu.) Fig. 430. 



81. C. triceps Michx., var. hirsuta (Willd.) Bailey. Slender; 

 leaves narrow, hairy; spikes 2-4 (usually 3), all contiguous or 

 occasionally the lowest somewhat removed, sessile, thick-cylindric 

 to globular, green or brown (4-7 mm. thick); perigynia broad- 

 ovoid, flattish, very obtuse, often sparsely hirsute 

 when young but smooth at maturity; staminate 

 scales very sharp ; pistillate scales acute or short- 

 awned, about the length of or shorter than the 

 perigynia. (C. triceps Britton in part, not Michx.) 



— Copses and dryish meadows, N. P]. to Ont., and 

 south w., rare northeastw. May-July. Fig. 431. ^^l- C. triceps, 



— Hybridizes with C. gracillima. ""• ^"■^"*'*- 

 Var. Smithii Porter. Tall, slender, olive-green, the leaves 



very long, very nearly smooth; spikes small, globular to cylin- 

 dric, the lowest often somewhat remote, all more inclined to be 

 peduncled ; perigynia globular and turgid, brown, squarrose, 

 exceeding the brownish scales. {G. caroliniana Schwein.) — 

 Fields and woodlands, Gulf States, locally n. to 

 N. Y., 111., and Mo. May, June. 



82. C. vir6scens Muhl. Slender, erect or 

 spreading, 0.4-1 m. high ; leaves very narrow, 

 more or less hairy ; spikes 2-4, sessile or slightly 

 stalked, compact, linoar-cylindric, 2-4 mm. thick ; 

 perigynia ellipsoid-ovoid, compressed, costate, 

 usually longer than the thin whitish acute scales. (Var. costata 

 Dewey ; Q. costellata Britton.) — Dry banks and copses, s. Me. 

 to s. Ont., and southw. June, .Inly. (W. I.) Fig. 432. — Hy- 

 bridizes with C. arctata and C. debilis, var. Budget. 



Var. Swanii Fernald. Lower, 1.5-8 dm. high, the 2-5 thick-cylindric to 

 subglobose spikes 3-5 mm. thick ; the perigynia less strongly ribbed. (C vires- 

 cens Man. ed. 6, not Muhl.) — Similar range. Fig. 433. 



83. C. formbsa Dewey. Slender, erect, 3-9 dm. high ; leaves flat, often 

 pubescent, 3-7 ram. broad, those of the culm short ; spikes 3-5, scattered, eliip 

 sold or cylindrical, 1-3 cm. long, compact, all flexuose or drooping ; perigynia 



432. C. virescens. 



