Carex acutiformis


Bietr. Naturk. 4: 43. 1789.

Treatment appears in FNA Volume 23. Treatment on page 494. Mentioned on page 491, 493.

Plants colonial; rhizomes long-creeping. Culms central, coarse, trigonous, 55–130 cm, scabrous-angled. Leaves: basal sheaths pale green to brownish or red tinged; ligules 5–14 mm; blades glaucous, M-shaped, (4.5–)5.5–12(–20) mm wide, glabrous. Inflorescences 15–35 cm; proximal 2–5 spikes pistillate, ascending; distal spikes erect; terminal 1–2(–3) spikes staminate. Pistillate scales lanceolate, acute to acuminate, glabrous, at least the proximal with scabrous awn to 3.5 mm. Perigynia ascending, ± glaucous, often strongly red dotted, ± strongly 12–18-veined, thin-walled, narrowly ovoid, flattened-trigonous, 3–4.5 × 1.4–2.1 mm, glabrous; beak 0.3–0.6 mm, emarginate to weakly bidentulate, teeth to 0.2 mm. 2n = 78.

Phenology: Fruiting Jun–Aug.
Habitat: Open swamps, wet, open thickets, marsh edges, sedge meadows, lakeshores
Elevation: 0–300 m


V23 915-distribution-map.jpg

Introduced; Ont., Conn., Ind., Mass., Md., Mich., N.Y., Eurasia, Africa.


An uncommon and local introduction, Carex acutiformis forms large, glaucous clones where it is established but is, as yet, not spreading aggressivly into adjacent habitats. It superficially resembles C. aquatilis, but is larger, has 3 stigmas, and has strongly veined perigynia 3–4.5 mm.

Selected References


Lower Taxa

... more about "Carex acutiformis"
A. A. Reznicek +  and Paul M. Catling +
Ehrhart +
Ont. +, Conn. +, Ind. +, Mass. +, Md. +, Mich. +, N.Y. +, Eurasia +  and Africa. +
0–300 m +
Open swamps, wet, open thickets, marsh edges, sedge meadows, lakeshores +
Fruiting Jun–Aug. +
Bietr. Naturk. +
Introduced +  and Illustrated +
Carex acutiformis +
Carex sect. Paludosae +
species +