Carex acutiformis


Bietr. Naturk.4: 43. 1789

Found in FNA Volume 23. Treatment on page 494. Mentioned on page 491, 493.
FNA23 P122 Carex lacustris pg 493.jpeg
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


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.



Facts about "Carex acutiformis"
AuthorA. A. Reznicek + and Paul M. Catling +
Elevation0–300 m +
HabitatOpen swamps, wet, open thickets, marsh edges, sedge meadows, lakeshores +
IllustratorSusan A. Reznicek +
PhenologyFruiting Jun–Aug. +
ReferenceNone +
Taxon nameCarex acutiformis +
Taxon parentCarex sect. Paludosae +
Taxon rankspecies +
VolumeVolume 23 +