provided by North American Flora
Carex pseudo-cyperus L. vSp. PI. 978. 1753
Carex reversa Gilib. Exerc. Phyt. 549. 1792. (Type from Grodna, Lithuania.)
Trasus chloroslachyos S. F. Gray, Nat. Arr. Brit. PI. 2 : 68. 1821. (Based on Carex Pseudo-Cyperus L.)
Trasus chloroslachyos var. bipedunculalus S. F. Gray, Nat. Arr. Brit. PI. 2: 68. 1821. (Type from
England.) Carex Pseudo-Cyperus var. typica Boott, 111. Carex 141. 1867. (Based on C. Pseudo-Cyperus L.) Carex longibracleata Dulac, Fl. Hautes-Pyr. 57. 1867. (Type from southern France.) Carex Pseudo-Cyperus var. Hatnpe, Fl. Hercyn. 299. 1873. (Type from Hercynia.) Carex Pseudo-Cyperus f. minor Hampe; Kiikenth. in Engler, Pflanzenreich 4 20 : 696. 1909. (Based on
C. Pseudo-Cyperus var. Hampe.)
Densely cespitose in large clumps from short stout rootstocks, not stoloniferous, the culms stout, 3-10 dm. high, erect, usually exceeded by the upper leaves, phyllopodic, strongly triangular, very rough above, light-brownish-tinged at base, the dried-up leaves of the previous year very conspicuous; leaves with well-developed blades usually 5-10 to a fertile culm, very strongly septate-nodulose, the lower clustered, the upper scattered, the blades flat above with revolute margins, channeled toward the base, light-green, firm, usually 2-3 dm. long, 4-10 mm. wide, long-attenuate and strongly roughened especially toward the apex, the sheaths thin and hyaline ventrally, somewhat yellowish-tinged, deeply concave at mouth, the ligule very conspicuous, much longer than wide; staminate spike solitary, short-ped uncled, erect, linear, 3-7 cm. long, 4-7 mm. wide, the scales oblong-oblanceolate, ciliate, rough-awned, reddish-brown with 3-nerved greenish or straw-colored center; pistillate spikes 3-6, approximate or the lower slightly separate, the lower strongly peduncled and more or less strongly nodding, the upper on shorter peduncles and less nodding, the peduncles slender, roughish, the spikes oblong cylindric, 2.5-7.5 cm. long, 8-12 mm. wide, very densely flowered, containing very numerous perigynia in many rows, the upper spreading, the lower reflexed; lower bracts leaf-like, little sheathing, exceeding inflorescence, the upper somewhat reduced; scales with small obovate or oblanceolate bodies, ciliate-serrulate above, reddish-brown with 3-nerved green center excurrent as a long rough awn, the bodies much narrower and several times shorter than the perigynia; perigynia lanceolate, 3.5-5 mm. long, 1.5 mm. wide, flattened-triangular in cross-section, scarcely inflated, coriaceous, puncticulate, smooth, shining, light-green or becoming brownishtinged, strongly ribbed, rounded at base and obliquely stipitate, rather abruptly tapering into a deeply bidentate smooth beak about 1 mm. long, the teeth erect or little spreading, stiff, 0.5-1 mm. long; achenes oblong-obovoid, 1.75 mm. long, 0.75 mm. wide, triangular with blunt angles, closely enveloped below, brownish, granular, sessile or nearly so, contracted at apex and continuous with the slender flexuous style; stigmas 3, slender, short, light-brownish.
Type locality: "Habitat in Europae fossis."
Distribution: Bogs, Newfoundland to Saskatchewan, and southward to northwestern Connecticut, New York, and Minnesota. Widely distributed in Eurasia; recorded from northern Africa. (Specimens examined from Newfoundland, Quebec, New Brunswick, Nova Scotia, Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New York, Pennsylvania, Wisconsin, Ontario, Michigan, Minnesota, Manitoba.)
- bibliographic citation
- Kenneth Kent Mackenzie. 1935. (POALES); CYPERACEAE; CARICEAE. North American flora. vol 18(7). New York Botanical Garden, New York, NY