Herbs perennial, efarinose, glabrous, aromatic. Leaves forming a rosette; petiole broadly winged, indistinct to 1/3 as long as leaf blade; leaf blade obovate-oblong to oblanceolate, 10--18(--25) X 4--6(--8) cm, base attenuate, margin regularly denticulate, apex obtuse to rounded. Scapes 30--60 cm; umbels 3--5, superimposed, 6--10-flowered; bracts linear to linear-lanceolate, 0.5--1.5 cm. Pedicel 1--1.5 cm. Flowers heterostylous. Calyx cup-shaped, 4--6 mm, parted to 1/3; lobes broadly ovate-triangular, apex obtuse to rounded. Corolla dark purple when young, infundibuliform; tube ca. 9 mm; limb concave, 1--1.5 cm wide; lobes subquadrangular, 3--4(--5) X 5--6 mm, apex subtruncate to slightly emarginate. Pin flowers: stamens 2.5--3 mm above base of corolla tube; style ca. 7 mm. Thrum flowers with positions reciprocal. Capsule ovoid, slightly longer than calyx. Fl. May-Jun. 2n = 22.
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