Herbs to 60 cm tall, erect, perennial. Stems terete, glabrous; branches yellowish brown, pubescent. Petiole 1-2.5 cm, pubescent; leaf blade ovate to broadly ovate, 7-15 × 4-9 cm, both surfaces glabrous, abaxially light green, adaxially dark green and lustrous, secondary veins 5-7 on each side of midvein and netted near margin, base broadly cuneate to subrounded, margin entire or inconspicuously undulate, apex acuminate, caudate, or sometimes acute. Thyrses terminal, 4-10 cm; peduncle 1-4 cm; rachis pubescent; bracts linear, 1-1.5 × ca. 0.5 mm; bracteoles linear, ca. 1 × 0.5 mm. Pedicel 2-2.5 mm. Calyx ca. 5 mm, gland-tipped pubescent; lobes linear-lanceolate, apex acuminate. Corolla light greenish yellow, ca. 1.2 cm, outside and inside pubescent; lobes of lower lip oblong-lanceolate, ca. 3 × 0.6 mm, subacute at apex; upper lip erect, apex 2-cleft to emarginate. Staminal filaments ca. 4 mm, pubescent; anther thecae ca. 2 mm; staminodes ca. 2 mm, sparsely pubescent. Ovary glabrous; style ca. 6 mm, sparsely pubescent. Capsule ca. 2 cm. Seeds not seen. Fl. Jul-Oct.
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