CYPERACEAE (SEDGE EAMILY) 



229 



crus-corvi. 



414. C. arenaria. 



of the inconspicuous scale. — Swamps and bottoms, 

 Ind. to Minn., Neb., and soutliw. ; rare nortliw. June, 

 July. Fig. 413. 



58. C. arenAria L. Extensively creeping, 0.7-5 dm. 

 high; leaves very narrow and very long-pointed, shorter 

 than the culm; head dense or some- 

 times interrupted, ovoid or cylindric ; 

 spikes few to many, those at the apex 

 of the head usually staminate, the 

 intermediate ones staminate at the 

 summit, the lowest entirely pistillate 

 and subtended by a bract 1-3 cm. 



long ; perigynium very strongly nerved on both faces, wing- 

 margined above, sharply long-toothed, about the length of 

 the brown subulate-acuminate scale. — Sea-beaches near Nor- 

 folk, Va. (Nat. from Eu.) Fig. 414. 



59. C. SartwSIlii Dewey. Culms stiff and strict, 0.3-1.2 

 m. high, from an elongate dark rootstock ; leaves (2-5 mm. 

 wide) produced into a long slender point, mostly shorter than 

 the culm ; staminate flowers variously disposed, frequently vrhole 

 spikes being sterile ; head 2.5-7 cm. long and rather narrow, 

 the individual spikes usually clearly defined, or occasionally the 

 head interrupted below, tawny-brown; perigynium 3-5 mm. 

 long, elliptic or lance-elliptic, nerved on both sides, very gradu- 

 ally contracted into a short beak ; scale blunt, smooth, hyaline- 

 edged, about the length of the perigynium. — Bogs, centr. N. Y. 

 to B. C, s. to O., 111., la., S. Dak., etc. June, 

 July. Fig. 415. 



60. C. stenophylla Wahlenb. Stiff, tufted, 

 0.5-2.5 dm. high; leaves pale, involute and 

 shorter than the culm ; perigynium ovate, 

 gradually contracted into a short and entire 

 rough-edged beak, tightly inclosing the achene, 

 at maturity longer than the hyaline acutish scale. — Dry grounds, n. 

 the Rocky Mts., and northw. June, July. (Eurasia.) Fig. 416. 



61. C. chordorrhiza L.f. Very extensively stoloniferous ; 

 culms mostly lateral and solitary, 1-4.6 dm. long; leaves 

 involute, shorter than the culm ; perigynium compressed-ovoid 

 to sub-globose, short-pointed and entire, 

 about the length of the acute scale. — 

 Cold bogs and soft lake-borders. Que. to 

 B. C, s. to Me., Vt., Pa., 111., la., etc.; 

 infrequent. May-July. (Eurasia.) Fig. 

 417. 



62. C. capitUta L. Bigid, 0.7-5 dm. high ; leaves fili- 

 form, shorter than the culm ; head uniformly staminate 

 above, brown, very small, 0.5-1 cm. long ; 

 ^eng't/reiam broadly ovate, very thin, wArtw/j, 

 prominently beaked, nerveless or nearly so, 

 erect and appressed, longer than the very 

 thin and obtuse scale. — Alpine region of 

 Mt. Washington, N. H. June- Aug. (Eu.) 418. o. capitata. 

 Fig. 418. 



63. C. marltima 0. F. Mueller. Mostly stout ; culm 

 sharp, smooth or rough above, 2-7 dm. high, usually over- 

 topped by the leafy tufts and the broad bracts ; leaves 

 smooth and flat, strongly ribbed, 3.5-10 mm. broad; pis- 

 tillate spikes 2-6, scattered, 2-8 cm. long, 0.8-2 cm. thick, 

 often staminate at tip ; staminate spikes 2-4, uneqiial, 

 the terminal 2-6 cm. long ; perigynium nearly orbicular. 



il6. C. stenophylla. 



SartWfiUii. 



la. to 



41T. C. chordorrhiza. 



