Eriophorum virginicum L.

Plants colonial from long-creeping rhizomes. Culms 40–120 cm × 0.6–1 mm, smooth or scabrous distally. Leaves: blades flat, trigonous in cross section distally, to 30 cm × 1.5–4 mm; distal leaf blade much longer than sheath. Inflorescences: blade-bearing involucral bracts 2–5, sometimes brown-tinged proximally, leaflike, longest 4–12 cm. Spikelets 2–10, usually in dense head, ovoid, 6–10 mm in flower, 10–20 mm in fruit; peduncles 2–10(–20) mm, scabrid; scales brown, often with green center, ovate-oblong, 4–5 mm, obscurely ribbed or with 3–5 equally prominent ribs, apex obtuse. Flowers: perianth bristles usually 10 or more, brown at least at base, rarely entirely white, 12–18 mm, smooth; anthers 0.7–1.5 mm. Achenes dark brown to black, narrowly obovoid or ellipsoid, 2.5–4 mm.

St. Pierre and Miquelon; N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que.; Conn., D.C., Ill., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va., Wis.

Fruiting mid summer–early fall.

Bogs, meadows; 0–1000m.

Eriophorum virginicum là loài thực vật có hoa trong họ Cói. Loài này được L. mô tả khoa học đầu tiên năm 1753.