399. Carex michauxiana Boeckeler, Linnaea. 41: 336. 1877.
Carex de Michaux
Carex rostrata Michaux, Fl. Bor.-Amer. 2: 173. 1803, not Stokes 1787
Culms obtusely trigonous in cross section, 15–70 cm, smooth. Leaves: ligules 1.2–3 mm, wider than long; blades yellowish green, M-shaped to flat, widest leaves 1.6–3.5(–4.2) mm wide, smooth abaxially, minutely papillose adaxially, especially distally. Inflorescences 1.8–18 cm; bract sheaths with apex concave; proximal (1–)2–3(–4) spikes pistillate, distal spikes erect, aggregated or the proximal sometimes remote, ovoid. Pistillate scales narrowly ovate, mostly 1/3–2/3 length of perigynia, apex acute. Anthers 1.1–2.7 mm. Perigynia spreading or the proximal somewhat reflexed, yellowish green, 20–26-veined, essentially uninflated, lanceolate, 8.7–12.1 × 1.3–2.1 mm, 4–7 times as long as wide, apex tapered, bidentulate; beak absent. Achenes 2.2–3 × 1.2–1.7 mm.
Fruiting late spring–summer. Bogs, fens, lakeshores, stream banks, open seeps, in sandy or peaty, often acidic soils; 0–1000 m; St. Pierre and Miquelon; Man., N.B., Nfld. and Labr., N.S., Ont., Que., Sask.; Maine, Md., Mass., Mich., Minn., N.H., N.Y., Vt., Wis.
Carex michauxiana is closely related to the east Asian C. dolichocarpa C. A. Meyer ex V. I. Kreczetowicz.