21 8 FLORA. 



acute. In bogs, Newf. and Lab. to S. N. J., mostly near the coast. Reported 

 from Minn. May-July. 



Scales ovate or ovate-lanceolate, acute or acuminate, not awned. Foetidae. 



Perigynia strongly many-nerved. 147. C. chordorhiza, 



Perigynia faintly several-nerved. 



Culms and leaves usually curved ; scales shorter than the perigynia. 



148. C. incurva. 

 Culms mostly straight, erect ; scales equalling the perigynia. 



149. C. stenophylla. 

 Scales lanceolate, awned, or long-acuminate. Arenariae. 



Scales 2-4 times longer than the perigynia ; western species. 150. C. Douglasii. 

 Scales about equalling the perigynia ; introduced sea-coast species. 



151. C. arenaria. 



147. Carex chordorhiza L. f. Creeping Sedge. (I. F. f. 817.) Rootstocks 

 slender ; culms slender, 2-4.5 dm. ta ^- Leaves 2-3 mm. wide, shorter than the 

 culm, somewhat involute in drying, the lower ones reduced to sheaths ; spikes 2-4, 

 aggregated into a head 8-12 mm. long ; perigynia ellipsoid, slightly more than 

 2 mm. long, flat on the inner side, convex on the outer, strongly many-nerved, 

 abruptly tipped by a short entire beak. In bogs and shallow water, Anticosti to 

 Hudson Bay and the N. W. Terr., south to Me., N. Y., Penn., 111. and Iowa. Also 

 in Europe. Summer. 



148. Carex incurva Lightf. Curved Sedge. (I. F. f. 818.) Densely 

 tufted ; culms smooth, often curved, 2-15 cm. long. Leaves less than 2 mm. wide, 

 usually curved ; spikes 2-5, sessile and aggregated into a dense head 10-16 mm. 

 in diameter ; staminate flowers few, borne at the tops of the spikes ; perigynia 

 ovate, slightly swollen, compressed, 3 mm. long, narrowed above into a short conic 

 entire beak, faintly several-many-nerved, scales ovate, brown or brownish, acute 

 or subacute, shorter than the perigynia. Greenland and Hudson Bay to Br. Col., 

 south in the Rocky Mts. to Colo. Also in Europe and Asia. Summer. 



149. Carex stenophylla Wahl. Involute- leaved Sedge. (I. F. f. 819.) 

 Densely tufted and strongly stoloniferous, pale green ; culms smooth, stiff, 7-20 cm. 

 high. Leaves involute, about I mm. wide; inflorescense much as in the preceding 

 species; perigynia about 2 mm. long, faintly several-nerved, flat on the inner face, 

 low convex on the outer, narrowed into a short entire beak; scales ovate, brownish, 

 acute or acuminate, about equalling the perigynia. In dry soil, Man. to Br. Col., 

 Iowa, Kans. and Colo. Also in Europe and Asia. June- Aug. 



150. Carex Douglasii Boott. Douglas' Sedge. (I. F. f. 820.) Light green ; 

 rootstock extensively creeping ; culms smooth or nearly so, 1-3 dm. tall. Leaves 

 2 mm. wide or less, somewhat involute in drying; spikes oblong, acute, 8-12 mm. 

 long, in a dense oblong or ovoid cluster 2-5 cm. long ; staminate flowers terminal 

 or variously distributed ; perigynia ovate -lanceolate, about 3 mm. long, faintly 

 several-nerved, the slender beak more than one-half as long as the body ; scales 

 pale greenish brown, lanceolate, scarious, smooth-awned, 2-4 times longer than the 

 perigynia. In dry soil. Manitoba to Neb., N. Mex., Br. Col. and Cal. June-Aug. 



151. Carex arenaria L. Sand Sedge. Sand-star. (I. F. f. 821.) Root- 

 stock extensively creeping; culms 1-4 dm. high. Leaves 2 mm. wide or less; lower 

 bract subulate ; spikes oblong, 6-10 mm. long, in a terminal ovoid cluster 2-5 cm. 

 long ; perigynia lanceolate, 3-4 mm. long, strongly several-nerved on both sides, the 

 flat strongly 2-toothed beak nearly as long as the body; scales lanceolate, long-acumi- 

 nate or awned, about equalling the perigynia. On sea beaches near Norfolk, Va. 

 Adventive or naturalized from Europe. June-July. 

 Perigynia strongly several-nerved, especially on the outer face. Nos. 152-154. Vul- 



PINAE. 



Beak of the perigynium shorter than the body. 152. C. conjuncta. 



Beak of the perigynium equalling or longer than the body. 



Spikes crowded in an oblong cluster ; beak 1-2 lengths of the body. 



153. C. stipata. 

 Spikes in a large branching cluster ; beak 3-4 lengths of the body. 



154. C. Crus-Corvt. 

 Perigynia nerveless or faintly nerved. Nos. 155-163. Multiflorae. 



Spikes very numerous in a branched decompound cluster, small. 155. C. decomfosita. 



