35. Carex Disperma Dewey. Soft-Leaved Sedge

Fig. 902

Carex tenella Schk. Riedgr. 23. f. 104. 1801. Not Thuill.

1799. Carex disperma Dewey, Am. Journ. Sci. 8: 266. 1824.

Light green, rootstocks elongated, very slender, culms almost filiform, rough, commonly reclining, 6'-2° long. Leaves soft, 1/2"-3/4" wide, spreading, usually shorter than the culm; spikes very small, androgynous, only 1-5-flowered, distant or the upper close together, the bracts absent or bristle-form; perigynia ovoid-ellipsoid, very thick, hard, finely many-nerved, about 1" long and 3/4' thick, tipped with a very minute, smooth, entire beak; scales ovate, hyaline, acute to cuspidate, shorter than or the lower equalling the perigynia; achene closely filling perigynium; stigmas 2.

In bogs, Newfoundland to British Columbia, New Jersey, Pennsylvania, Indiana, Michigan, Colorado and California. Also in Europe and Asia. June-Aug.

36. Carex Trisperma Dewey. Three-Fruited Sedge

Fig. 903

Carex trisperma Dewey, Am. Journ. Sci. 9: 63. 1825. Carex trisperma var. Billingsii Knight, Rhodora 8: 185. 1906.

Bright green, culms filiform, weak, often divaricate-spreading above lowest bract, usually reclining or spreading, very slightly roughened, 1°-2 1/2° long, the rootstocks slender, often elongated. Leaves flaccid, flat, 1" wide or less; spikes 1 to 3, only 1-5-flowered, gynaecandrous, widely separated, the lowest much exceeded by a bristle-form bract 1/2'-5' long; perigynia oblong, ascending, green, 1 1/4"-2" long, nearly 1" wide, very finely many-nerved, narrowed at both ends and tipped with a very short, nearly entire beak, the margins smooth or nearly so; scales ovate or ovate-lanceolate, hyaline with a green mid-vein, acute, somewhat shorter than the perigynia; stigmas 2.

In swamps and wet woods, Newfoundland to Saskatchewan, south to Maryland, Ohio, Michigan and Nebraska. Ascends to 2500 ft. in Vermont. June-Aug.

36 Carex Trisperma Dewey Three Fruited Sedge 903

37. Carex Tenuifldra Wahl. Sparse-Flowered Sedge

Fig. 904

Carex tenuiflora Wahl. Kongl. Vet. Acad. Handl. (II.) 24: 147. 1803.

Light green, culms very slender or filiform, erect or reclining, rough above, 8-2° long, loosely caespitose and stoloniferous. Leaves 1/4"-1" wide, flat, usually much shorter than the culm; spikes 2-4, gynaecandrous, subglobose, few-flowered, about 2!" in diameter, usually bractless, densely aggregated into an ovoid or suborbicular head; perigynia pale, oblong-obovoid, densely puncticulate, coriaceous, obscurely nerved, narrowed at both ends, 1 1/4"-1 3/4" long, a little more than 3/4" wide, almost beakless, spreading, smooth or nearly so; scales white with green midrib, acute or obtusish, about equalling the perigynia; achene nearly filling perigynium; stigmas 2.

In bogs. New Brunswick and Hudson Bay to Manitoba, south to Maine, Massachusetts, central New York and Minnesota. Local. Also in Europe and Asia. Summer.

37 Carex Tenuifldra Wahl Sparse Flowered Sedge 904