Herbs to 50 cm tall. Stems erect, 4-angled, sulcate, tuberculate on basal part, pubescent on apical part. Leaves cauline; petiole 2-4 cm, pubescent; leaf blade elliptic, 6-15 × 3-7 cm, both surfaces glabrous except for pubescence along veins, abaxially glaucous, adaxially green, secondary veins 10-12 on each side of midvein, base acute, margin entire or serrate, apex acute to shortly acuminate. Racemes terminal only, unbranched or sometimes branched, 10-16 cm; peduncle 2-5 cm, glabrous; bracts linear, 4-7 × ca. 1 mm, glabrous, apex acute; bracteoles lanceolate, 2-3 × ca. 1 mm, glabrous, apex acute. Pedicel 2-3 mm, glabrous. Calyx 5-7 mm, glabrous; lobes linear, unequal, apex obtuse. Corolla white, 1.8-2.2 cm, outside glabrous; lobes oblong, ca. 4 × 3 mm, subequal, apex rounded. Staminal filaments glabrous; anther thecae spherical, ca. 1 mm in diam. Ovary glabrous; style glabrous; stigma 2-cleft. Capsule oblong, ca. 8 mm, glabrous. Fl. Apr.
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