Leaves 20--35 × 0.5--2(--4) cm, glabrous, margin smooth. Scape 60--120 cm, glabrous or sparsely pubescent. Raceme 20--30 cm at anthesis, densely many flowered; bracts lanceolate, 1--2 cm, midvein dark brown, margin pale, membranous, sparsely long ciliate, apex long filiform acuminate. Pedicels ascending, not subappressed to rachis, 1--1.5 cm, slender. Perianth narrowly campanulate; segments yellow or pale yellow, sometimes turning brownish or yellow-brown, narrowly elliptic-oblong or narrowly oblong-lanceolate, 0.8--1.2 × 0.2--0.25 cm, darker and 3-veined proximally, 1-veined distally, involute immediately after anthesis, persistent and recurved in fruit. Stamens conspicuously exserted from perianth by up to 8 mm. Capsule usually greenish brown, subglobose, 0.6--1 cm in diam., smooth; valves rather thin and soft. Seeds narrowly winged at both ends. Fl. May--Jul, fr. Jul--Aug. 2 n = 14.
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