Herbs glabrous except for flowers. Stems green, to 2 m. Leaf blade narrowly elliptic or oblong-elliptic, 3-4 cm × 7-11 mm, glabrous, acuminate at both ends; lateral veins obsolete. Peduncle 1.5-5 cm, thick. Flower buds reddish yellow, apex acuminate. Sepals broadly ovate, ca. 1 × 1 mm, glabrous. Corolla white, urceolate, throat constricted, with retrorse pubescence; tube ca. 3 mm; lobes ovate-triangular, ca. 1 × 0.5 mm, spreading, thickened at middle. Corona lobes anchor-shaped, apex semiorbicular. Apical membrane of anthers acuminate; pollinia oblong. Ovaries glabrous. Stigma head discoid, mucronate. Fl. Mar.
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