Orthosiphon lanceolatus Sun ex C. H. Hu.

Herbs perennial. Roots sometimes fusiform. Stems erect, to 50 cm tall, base woody, apex semiwoody, branched, appressed minutely hispid, internodes longer than leaves. Petiole short or obsolete; leaf blade oblong-lanceolate, 2-8.5 × 0.5-2.3 cm, papery, scabrid, appressed minutely hispid, base attenuate-cuneate, margin coarsely serrate except at base, apex obtuse to acuminate, lateral veins 5-7-paired. Thyrses terminal, lax; rachis minutely hispid; bracts subcircular, ca. 2 mm wide, margin ciliolate, apex mucronate. Pedicel 3-5 mm, minutely hispid. Calyx tubular, ca. 5.5 × 2 mm, finely pilose, purple-red; upper lip circular, ca. 2 mm wide, apex mucronate; teeth of lower lip subulate, needlelike, anterior teeth longer. Corolla white, ca. 1.1 cm, sparsely puberulent; tube ca. 8 mm, ca. 1.8 mm in diam. at base, slightly wider at throat, sparsely puberulent inside; upper lip ca. 4 × 4 mm; lower lip oblong, ca. 3.5 × 3 mm. Stamens slightly exserted from throat. Nutlets brown, subglobose, ca. 1.7 mm in diam., minutely dotted. Fl. Aug.

* Waste areas. Hainan.