Carex haydenii


Amer. J. Sci. Arts, ser. 2, 18: 103. 1854.

Common names: Carex de Hayden
Synonyms: Carex acuta var. erecta Dewey Carex rousseaui Raymond Carex stricta var. decora L. H. Bailey Carex stricta var. haydenii (Dewey) Kükenthal
Treatment appears in FNA Volume 23. Mentioned on page 395.

Plants cespitose. Culms acutely angled, 30–115 cm, scabrous. Leaves: basal sheaths red-brown, indistinctly ladder-fibrillose; sheaths of proximal leaves glabrous, fronts with red-brown spots, veinless, apex U-shaped; blades 3–5 mm wide. Inflorescences: proximal bract subequal to inflorescence, 2–4 mm wide. Spikes erect; proximal 2–3 spikes pistillate, 1–5 cm × 4–6 mm, base obtuse; terminal 1–2 spikes staminate. Pistillate scales red-brown, longer than perigynia, apex acute or acuminate, awnless. Perigynia divergent, olive-brown with red-brown spots on apical 1/2, veinless, inflated, loosely enclosing achenes, obovoid, 1.5–2.8 × 1.5–2 mm, dull, apex rounded, papillose; beak green, 0.1–0.2 mm. Achenes not constricted, glaucous. 2n = 54.

Phenology: Fruiting Jun–Aug.
Habitat: Wet meadows, moist prairies
Elevation: 0–1,000 m


V23 704-distribution-map.jpg

N.B., Ont., Que., Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., Nebr., N.H., N.Y., N.Dak., Ohio, Pa., S.Dak., Vt., Wis.


Carex haydenii is a species of seasonally saturated soils in open habitats. It appears to be declining in abundance with changes in land use.

Carex haydenii is often confused with C. stricta; it can be identified by the inflated perigynia that are rounded apically, acute scales, and glabrous leaves and sheaths. Only basal sheaths of C. haydenii are ladder-fibrillose. Although often sympatric with C. stricta and C. nigra, no hybrids appear to be formed.

Selected References


Lower Taxa

... more about "Carex haydenii"
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
Carex de Hayden +
N.B. +, Ont. +, Que. +, Ill. +, Ind. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.Y. +, N.Dak. +, Ohio +, Pa. +, S.Dak. +, Vt. +  and Wis. +
0–1,000 m +
Wet meadows, moist prairies +
Fruiting Jun–Aug. +
Amer. J. Sci. Arts, ser. +
Illustrated +  and Endemic +
Carex acuta var. erecta +, Carex rousseaui +, Carex stricta var. decora +  and Carex stricta var. haydenii +
Carex haydenii +
Carex sect. Phacocystis +
species +