Carex tenera

Dewey
Amer. J. Sci. Arts 8: 97. 1824.
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 371. Mentioned on page 370.

Plants densely cespitose. Culms often nodding, 20–90 cm, vegetative culms inconspicuous with few leaves clustered at apex. Leaves: sheaths abaxially hyaline, adaxially whitish mottled, summits U-shaped, shortly prolonged less than 2.8 mm beyond collar, smooth or sometimes papillose (at 30X); distal ligules 1–2 mm; blades 3–5 per fertile culm, 15–35 cm × 1.3–2.5(–3) mm. Inflorescences often flexible and nodding, open, with elongate spikes, brown, (2–)2.5–5 cm × 7–10 mm; proximal internode (4–)7–17(–20) mm; 2d internode (3–)6–10 mm; proximal bracts scalelike or to 1(–4) cm; rachis usually thin and wiry. Spikes 3–8, distant or loosely aggregated, ovoid to globose, 4–10 × 3.5–6 mm, base tapered or clavate, apex rounded. Pistillate scales white-hyaline or pale brown with green to brown midstripe not reaching scale tip, proximal scales ovate, 2.3–3.3 mm, shorter by 0–1.6 mm and narrower than perigynia, apex obtuse on proximal scales, acute on distal. Perigynia erect to ascending, brown, conspicuously 5–7-veined abaxially, veinless or faintly 3–7-veined adaxially, ovate to broadly ovate, plano-convex, 2.8–4(–4.5) × 1.4–1.9(–2) mm, 0.4–0.5 mm thick, 2–2.3 times as long as wide, margin flat, including wing 0.1–0.5 mm wide, ciliate-serrulate at least distally; beak spreading, appressed or ascending; straw colored to reddish brown at tip, flat, ± ciliate-serrulate, abaxial suture inconspicuous, distance from beak tip to achene 1.3–2.7 mm. Achenes ovate, 1.3–1.7 × 0.85–1.1 mm, 0.5 mm thick. 2n = 52, 54, 56.

Distribution

V23 654-distribution-map.jpg

Alta., B.C., Man., N.B., N.S., Ont., Que., Sask., Conn., D.C., Ill., Ind., Iowa, Kans., Ky., Maine, Mass., Md., Mich., Minn., Mo., Mont., N.C., N.Dak., N.H., N.J., N.Y., Nebr., Ohio, Oreg., Pa., R.I., S.Dak., Va., Vt., W.Va., Wis., Wyo.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Perigynium beak appressed or ascending in spikes, exceeding pistillate scales by 0–0.8 mm; leaf sheaths at least sparsely papillose (30X). Carex tenera var. tenera
1 Perigynium beak spreading, exceeding pistillate scales by 0.7–1.6 mm; leaf sheaths smooth. Carex tenera var. echinodes
... more about "Carex tenera"
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
Alta. +, B.C. +, Man. +, N.B. +, N.S. +, Ont. +, Que. +, Sask. +, Conn. +, D.C. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Mass. +, Md. +, Mich. +, Minn. +, Mo. +, Mont. +, N.C. +, N.Dak. +, N.H. +, N.J. +, N.Y. +, Nebr. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Va. +, Vt. +, W.Va. +, Wis. +  and Wyo. +
Amer. J. Sci. Arts +
Illustrated +  and Endemic +
Carex tenera +
Carex sect. Ovales +
species +