Perennials, 15-35 cm tall. Roots stout, ca. 2 cm in diam. Stems hollow. Basal leaves 3 or 4 pairs, scalelike. Stem leaves petiole flattened, narrowly winged, to 6 cm; leaf blade ovate, broadly ovate, or triangular-ovate, to 9.5 cm, adaxially glabrous or puberulent, base cuneate to shallowly cordate, margin double serrate. Thyrses terminal, racemose or narrowly paniculate, ca. 5 cm; cymes 1(-3)-flowered; peduncle glandular hairy; bracts small. Pedicel glandular hairy. Calyx 5-6 cm; lobes ovate-lanceolate, apex acute. Corolla yellow-green, ca. 9 cm; tube subglobose, ca. 6 mm; lower lip lobes rounded; upper lip ca. 2.5 mm longer than lower lip, lobes orbicular, with overlapping margins. Stamens slightly shorter than lower lip; staminode obovate, small. Style as long as ovary or slightly longer. Capsule ovoid, 1-1.4 cm. Fl. May, fr. Jun.
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