Carex deweyana

Schweinitz

Ann. Lyceum Nat. Hist. New York 1: 65. 1824

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 324. Mentioned on page 323.

Plants densely cespitose. Culms 14–89(–101) cm × 0.3–1.1 mm wide, smooth or papillose. Leaves: ligule on distal leaf 0.9–2.2 mm, as long as wide; blades 0.6–4.2 mm wide, widest blade 2.4–4.2 mm wide. Inflorescences 12–56 mm; proximal internode 6–34 mm; proximal bracts 6–49 mm, awn 7–46 mm; spikes (2–)3–5, longest ones 2–5, usually gynecandrous; proximal spikes with 1–2 staminate and (5–)7–12 pistillate flowers, 5.2–11(–13) × (2.1–)3.7–6.9 mm; terminal spikes usually with 1–3(–5) staminate and (7–)9–13(–16) pistillate flowers, 6.8–13 × 3.8–8.1 mm. Pistillate scales with colorless or stramineous margins, 3–4.5 × 1.6–2.2 mm, body 2.8–4.2 mm, apex acuminate to short-awned, awn to 0.6 mm. Staminate scales with colorless or stramineous margins, 3–5.3 × 1.2–1.6 mm, apex acute to acuminate or occasionally short-awned to 0.3 mm. Anthers (1.8–)1.9–2.2 mm. Perigynia erect to ascending, green to pale brown, 0–5-veined abaxially, usually veinless adaxially, narrowly ovate, 4–4.9(–5.2) × 1.3–1.5(–1.6) mm, 2.9–3.8 times as long as wide, apex gradually tapering; beak 1.4–2.1 mm, 0.32–0.4 times as long as perigynia, margins serrulate, apex entire or bidentulate, teeth to 0.2 mm, 0–0.05 times as long as perigynia. Stigmas 1.9–2 mm. Achenes 1.8–2.2 × 1.2–1.5 mm wide, 1.3–1.8 times as long as wide.

Distribution

V23 573-distribution-map.jpg

Alta., B.C., Man., N.B., N.S., N.W.T., Ont., P.E.I., Que., Sask., Yukon, Alaska, Colo., Conn., Ill., Iowa, Maine, Mass., Mich., Minn., Mont., N.Dak., N.H., N.J., N.Mex., N.Y., Ohio, Pa., S.Dak., Vt., Wash., Wis., Wyo.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Longest inflorescences 35–56 mm; longest proximal internodes (11–)13–34 mm; longest proximal bracts 15–49 mm. Carex deweyana var. deweyana
1 Longest inflorescences 12–32 mm; longest proximal internodes 6–10 mm; longest proximal bracts 9–12(–18) mm. Carex deweyana var. collectanea
... more about "Carex deweyana"
Robert F. C. Naczi +
Schweinitz +
Deweyanae +
Alta. +, B.C. +, Man. +, N.B. +, N.S. +, N.W.T. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Conn. +, Ill. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, N.Dak. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, Ohio +, Pa. +, S.Dak. +, Vt. +, Wash. +, Wis. +  and Wyo. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Carex deweyana +
Carex sect. Deweyanae +
species +