Carex retrorsa


Ann. Lyceum Nat. Hist. New York 1: 71. 1824.

Common names: Carex réfléchi
Treatment appears in FNA Volume 23. Treatment on page 508. Mentioned on page 503, 505, 513.

Plants cespitose; rhizomes very short or inconspicuous. Culms trigonous in cross section, 10–105 cm, smooth distally. Leaves: basal sheaths dark reddish brown; ligules longer than wide; blades mid to dark green, flat to W-shaped, widest leaves 3–10 mm wide, glabrous. Inflorescences 3–20(–35) cm; proximal bract 19–70(–100) cm, (2.5–)3–9 times longer than inflorescence; proximal (2–)3–6 spikes pistillate, ascending to spreading, at least the distal erect, ca. 20–150-flowered, cylindric; terminal 1(–3) spikes staminate, slightly if at all elevated beyond summit of crowded pistillate spikes. Pistillate scales narrowly ovate, 2.4–4.5 × 1.1–1.8 mm, shorter than perigynia, margins entire, apex acute to acuminate, awnless. Perigynia mostly reflexed at maturity, often green or straw colored, strongly 6–13-veined, veins running into beak, ovate, 6–10 × (1.6–)2.1–3.4 mm, apex abruptly tapered; beak 2.1–4.5 mm, bidentulate, smooth, teeth straight, 0.3–1.1 mm. Stigmas 3. Achenes pale brown, symmetric, not indented, trigonous, smooth.

Phenology: Fruiting Jun–Aug.
Habitat: Swamps, wet thickets, often along streams, marshes, sedge meadows, shores of streams, ponds, and lakes
Elevation: 0–1900 m


V23 945-distribution-map.jpg

B.C., Man., N.B., Ont., Que., Sask., Conn., Idaho, Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mont., N.Y., Oreg., Pa., Utah, Vt., Wash., Wis., Wyo.


Very rarely, specimens appear to be intermediate between Carex retrorsa and C. lupulina or C. lupuliformis; they are likely hybrids.

Selected References


Lower Taxa

... more about "Carex retrorsa"
A. A. Reznicek +  and Bruce A. Ford +
Schweinitz +
Vesicariae +
Carex réfléchi +
B.C. +, Man. +, N.B. +, Ont. +, Que. +, Sask. +, Conn. +, Idaho +, Ill. +, Ind. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, N.Y. +, Oreg. +, Pa. +, Utah +, Vt. +, Wash. +, Wis. +  and Wyo. +
0–1900 m +
Swamps, wet thickets, often along streams, marshes, sedge meadows, shores of streams, ponds, and lakes +
Fruiting Jun–Aug. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Carex retrorsa +
Carex sect. Vesicariae +
species +