Stems 1–2.5 m, ± glabrous proximally, tomentose distally. Leaves ovate, distalmost lanceolate to lance-linear, 20–40 × 15–25 cm, reduced distally, tomentose-ciliate, curly-hairy abaxially, glabrous or veins sparsely short-hairy adaxially. Inflorescences dense-paniculate, with spreading to stiffly erect branches to near tip or distal 1/3–1/2 unbranched, 30–70 cm, tomentose; bracts ovate-elliptic to lanceolate, shorter than to obviously longer than flowers. Tepals creamy white, greenish basally, lanceolate to elliptic or oblong-ovate, not or very slightly clawed, 8–17 mm, margins entire to denticulate, glabrous to abaxially tomentose; gland 1, basal, green, V-shaped; ovary glabrous or with few hairs; pedicel 1–6 mm. Capsules narrowly ovoid, 2–3 cm, glabrous. Seeds flat, winged, 10–12 mm.
Swamps, creek bottoms, moist woodlands and meadows, from lowland to the sub-alpine zone.
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