Bulbels ca. 2.5 × 1.2--1.5 cm. Stem erect, 0.5--1.5 m × 2--3 cm, hollow. Leaves absent in proximal part of stem except basal ones, crowded in middle part, laxly spirally alternate in distal part; petiole 6--20 cm; leaf blade ovate to ovate-cordate, 10--22 × 6--12 cm. Raceme 3--5-flowered; bracts oblong, 4--5.5 × ca. 1.6 cm, persistent. Tepals white or greenish, purple streaked adaxially, linear-oblanceolate, 13--15 × 1.5--2 cm. Stamens 8--10 cm, ca. 2/3 as long as tepals; anthers 8--9 mm. Ovary 3--3.5 cm × 5--7 mm. Style 6--6.5 cm. Capsule subglobose, 4--5 × 3--3.5 cm. Seeds 4.5--2.5 mm, reddish brownish winged all round. Fl. Jul--Aug, fr. Aug--Sep. 2 n = 24*.
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