Stems erect, to more than 1 m × 0.5--1.5 cm. Leaf sheaths to 4 cm, densely brownish yellow hirsute; leaf blade elliptic, 15--50 × 5--10.5 cm, brownish yellow hirsute near margin on both surfaces and below middle of abaxial major veins, base cuneate, apex acuminate. Heads with 25 or more flowers, 4--6 cm in diam. in fruit. Sepals obovate, ca. 5 mm at anthesis, to 13 mm in fruit, abaxially densely brown hirsute along midvein, rarely subglabrous, elsewhere glabrous or very sparsely hairy. Petals white. Capsule ovoid-globose, trigonous, ca. 7 mm, much shorter than persistent sepals, sparsely hirsutulous near obtuse apex. Seeds ca. 3 × 2 mm, rugose. Fl. Jul--Aug, fr. Sep.
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