Herbs perennial, with a 5--7 cm long stock formed by overlapping petioles and basal bud scales. Leaves forming a rosette; petiole winged, usually slightly shorter than leaf blade; leaf blade lanceolate to oblanceolate or narrowly obovate, 8--20 X 1.5--4.5 cm, abaxially pale yellow farinose, base attenuate, margin regularly serrate to crenate, apex obtuse to acute. Scapes 20--55 cm, farinose on upper part; umbel solitary, 5-or 6-flowered; bracts lanceolate to subulate, 6--10 mm. Pedicel 1--3(--5) cm, elongating to 5 cm in fruit, yellow farinose. Flowers nodding, heterostylous. Calyx tubular-campanulate, 8--10(--15) mm, yellow farinose, parted to middle or slightly below; lobes oblong, apex rounded to obtuse. Corolla pale yellow or white, campanulate, exannulate; tube 1.4--1.6 cm; limb 2--3 cm wide; lobes broadly obovate, deeply emarginate. Pin flowers: stamens near middle of corolla tube; style nearly reaching mouth. Thrum flowers with positions reciprocal. Capsule cylindric, ca. as long as to slightly longer than calyx. Fl. Jun-Jul. 2n = 22.
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