Description from Flora of China
Herbs perennial, erect, to 1 m tall. Stems finely puberulent or subglabrous. Petiole 0.8-1.2 cm; leaf blade ovate-lanceolate to elliptic-lanceolate, 4-9.5 × 1.5-4 cm, reduced toward stem apex, ± leathery, adaxially glabrous, abaxially finely puberulent along veins otherwise glandular, lateral veins not extending to margin, base broadly cuneate, margin (4-)6-8-undulate-dentate, apex caudate-acuminate. Racemes secund, terminal, 7-14 cm; bracts lanceolate, 3-6 × 1-1.25 mm, ciliate, apex acute. Pedicel 5-6 mm, finely puberulent. Calyx 3-3.5 mm, finely puberulent, ciliate; scutellum semicircular, 2-2.5 mm, ca. 4.5 mm in fruit. Corolla dark purple, to 3.1 cm; tube ca. 2.5 cm, bent at base, gradually dilated above middle to 8 mm wide at throat, puberulent outside, villous on basal 1/4 inside; limb glabrous inside, upper lip erect, broadly triangular-ovate, ca. 9 mm wide, base abruptly constricted; lower lip spreading, ovate-orbicular; lateral lobes triangular, ca. 2.5 mm wide. Nutlets unknown. Fl. Apr-May.
Grasslands near forests; 1200 m. Hainan [Indonesia, Philippines].