Stems erect, single, 20-35 cm tall, glabrous or nearly so, striate-ribbed. Petiole of basal leaves long, ca. 8 cm; leaf blade oblong to lanceolate, 4-8 × 1.5-4 cm, usually glabrous, rarely sparsely villous, base cuneate, apex obtuse; stem leaves short petiolate or ± sessile, oblong to ovate, 2-5 cm, base rounded or subcordate. Inflorescences terminating stems and branches, becoming widely spaced paniculate. Pedicel 3-5 mm, villous. Calyx 5-7 mm, slightly enlarged in fruit; lobes lanceolate, villous outside. Corolla 1.3-1.5 cm, glabrous; throat appendages minute or absent, lower appendages absent; lobes vertically spreading, lanceolate, somewhat shorter than tube. Filaments ca. 1 mm; anthers ca. 2 mm. Style exserted from corolla. Nutlets ovate-orbicular, ca. 1.5 cm in diam., wing entire or sometimes repand. Fl. Apr-May.
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