Herbs 0.5-1.5 m tall, isophyllous. Stems erect or basal portion prostrate and rooting at nodes, 4-angled, glabrous or bifariously pubescent. Petiole 0.4-5.5 cm, glabrous; leaf blade elliptic to ovate-elliptic, 2.5-16 × 0.9-5.5 cm, densely covered with linear cystoliths, glabrous, secondary veins 4-9 on each side of midvein, base broadly cuneate, margin slightly undulate, apex acuminate. Spikes terminal or axillary, 2-5 cm, 1-sided; peduncle 1-9 cm; rachis pubescent or gland-tipped pubescent; bracts 4-ranked, heteromorphic; sterile bracts elliptic, 7.5-8 × 4-6 mm, abaxially gland-tipped puberulent, hyaline margin 0.8-1.5 mm broad and ciliate, apex cuspidate; fertile bracts lanceolate, 6.5-7.5 × ca. 4 mm, abaxially gland-tipped puberulent, hyaline margin ca. 1 mm wide and ciliate, apex cuspidate; bracteoles elliptic, ca. 6 × 4 mm, abaxially scabrid, adaxially glabrous. Calyx 6-7 mm; lobes linear, unequal, scabrid. Corolla light yellowish green outside and white with purple dots inside, ca. 1.5 cm, gland-tipped pubescent and pubescent; tube ca. 7 mm; lower lip 3-lobed, middle lobe larger; upper lip ca. 6 mm, apex emarginate. Staminal filaments ca. 5 mm, glabrous; anther thecae ca. 1.5 mm. Ovary hirsute; style ca. 1 cm, basal portion hirsute. Capsule ca. 8 mm, gland-tipped puberulent or puberulent. Seeds ovate in outline, ca. 2 × 1.5 mm, verrucose. Fl. Dec-Feb, fr. Apr-May.
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