Carex crus-corvi Shuttlew. ex Kunze

Primarily a species of the Mississippi drainage, Carex crus-corvi also occurs along the coastal plain.

Plants with basal sheaths of previous year persistent, entire. Culms to 90 cm × 5 mm, scabrous. Leaves: sheaths all with blades, fronts smooth, red spotted, indistinctly linearly veined, apex red-brown, membranous, truncate, minutely ciliate; ligules rounded, 2 mm, free limb to 0.5 mm; blades glaucous, not epistomic, to 90 cm × 12 mm. Inflorescences densely spicate, cylindric, elongate, with 15–25 distinguishable branches, 10–20 × 6 cm; proximal internode to 10 mm; proximal bracts setaceous, apparent. Scales hyaline. Perigynia pale brown, red-brown distally, 10–12-veined abaxially, 5-veined adaxially, to 8 mm, body to 1.2 mm wide, base to 2.2 mm wide, base distended proximally forming disk, cordate; stipe to 0.9 mm; beak to 4.5 mm, mouth deeper abaxially, serrulate, apical teeth somewhat spreading. Achenes ovate, 2.5 × 1.4 mm; stalk to 0.2 mm; persistent style base cylindric, 0.3 mm. 2n = 52.

Ont.; Ala., Ark., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Mich., Minn., Mo., Nebr., N.C., Okla., Ohio, S.C., Tenn., Tex., Va., W.Va.

Fruiting May–Aug.

Seasonally saturated or inundated soils in wet meadows, marshes, swamps, alluvial bottomlands; 0–1000m.

Carex bayardii Fernald; C. crus-corvi var. virginiana Fernald

Carex crus-corvi Shuttiw.; Kunze, Suppl. Riedgr 128. 1842; pi. 32. 1844.
Carex Crus-corvi f. orlhoclados Kunze, Suppl. Riedgr. 166, pi. 42. 1844. (Type from Louisiana.)
Carex Crus-corvi f. orthostachys Kunze, Suppl. Riedgr. 167. 1844. (Type from Illinois.)
Carex ornithorhyncha Engelm.; Kunze, Suppl. Riedgr. 167, as synonym. 1844.
Carex Hyslrix A. Gray; Kunze. Suppl. Riedgr. 167, as synonym. 1844.
Carex sicaeformis Boott, Bost. Jour. Nat. Hist. 5: 113. 1845. (Type from New Orleans, Louisiana.)
Carex Halei Dewey. Am. Jour. Sci. II. 2: 248. 1846. (Type from Louisiana.)
Cespitose, the rootstocks short-prolonged, tough, stout, black, fibrillose, the culms very stout, S-12 mm. thick at base, erect, 5-9 dm. high, light-brown at base, shorter than the leaves, sharply triangular with concave sides, the angles strongly serrulate and slightly winged; leaves with well-developed blades 5-8 to a culm, the blades erect-ascending, flat, light-green, very elongate. 3-7 dm. long, 5-10 mm. wide, serrulate on margins and roughened towards the apex, the sheaths septate-nodulose dorsally, and ventrally thin, strongly purplish-dotted, not crossrugulose and not thickened nor prolonged beyond base of blade at mouth, the ligule conspicuous, dark-margined, wider than long; spikes very numerous, in a compound terminal head 7-17 cm. long, 1.5-5 cm. thick, the lower branches often somewhat separate; separate spikes hardly distinguishable, the staminate flowers apical, inconspicuous, with the several to many ascending or spreading perigynia beneath; lower bract usually present, bristleform, 8 cm. long or less, sometimes wanting, the others, if present, short; scales lanceolate-triangular, thin, greenish or light-brownish-tinged, or soon hyaline, with 3-nerved green center, acuminate to aristate, 3-5 mm. long and narrower than the perigynia; perigynia plano-convex, 6-7 mm. long, yellowish or brownish in age, the body narrowly ovoid, the lower third turgid, disk-like, very spongy and subcoriaceous, 2.5-3 mm. long, 1-1.25 mm. wide, strongly nerved dorsally, obscurely nerved and sharp-margined ventrally, short-stipitate, truncate-cordate at base, and tapering into a serrulate slender beak 2-3 times length of body, dorsally cleft, deeply bidentate, the teeth subulate, slightly spreading; achenes lenticular, strongly ovate, rounded at the sbort-stipitate base, tapering above, slightly apiculate, 1.75 mm. long, 1 mm. wide; style slender, straight, somewhat enlarged at base, jointed with achene; stigmas two, lightreddish-brown, slender, short.
TTPS LOCALITY: New Orleans, Louisiana (Drummond 432).
Distribution: Swamps. Florida to Texas, and northward in the Mississippi Valley to southern Michigan, southern Minnesota, and eastern Nebraska. (Specimens examined from Michigan, Wisconsin. Indiana, Illinois, Minnesota, Iowa, Kentucky. Tennessee. Missouri, Kansas, Oklahoma, Arkansas. Texas. Louisiana, Mississippi, Georgia, Florida.)
Ii.i.i strations: Kunze, Suppl. Riedgr. /. 32. 42: Kritt. & Brown, 111. Fl. /. 824; ed. 2. /. 901; Rob. & Fern. Man. /. 413; Engler. Pflanzenrcich 4": 169. /. 27. M-Q; Boott, 111. Carex 25. pi. 65.

Carex crus-corvi adalah spesies tumbuhan seperti rumput yang tergolong ke dalam famili Cyperaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Carex crus-corvi sendiri merupakan bagian dari genus Carex. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Shuttlew. ex Kunze.

Carex crus-corvi là một loài thực vật có hoa trong họ Cói. Loài này được Shuttlew. ex Kunze mô tả khoa học đầu tiên năm 1844.