Description from Flora of China
Stems woody, basally nearly leafless, scars slightly elevated, reniform. Leaves alternate except for 1 or 2 subopposite pairs at mid stem; petiole ca. 2 cm at mid stem; leaf blade oblanceolate, 7-8.5 × 3-3.7 cm, adaxially subglabrous, abaxially glabrous with hirtellous veins, lateral veins anastomosing near margin, base cuneate-decurrent, margin shallowly undulate, apex obtuse. Racemes ca. 15 cm; peduncle hirtellous; bracts linear-lanceolate, hirtellous, as long as pedicels. Pedicel ca. 2.2 mm in flower, to 4 mm in fruit, hirtellous. Calyx ca. 3.5 × to 4 mm, veins puberulent, shallowly dentate; upper teeth equal, deltoid, less than 1/2 as long as lower teeth. Corolla rose, ca. 2 cm sparsely puberulent, bearded at middle inside; tube to 1.6 cm, base narrow, gradually dilated into a broad throat to 8.5 mm wide; upper lip ca. 4.5 mm wide, slightly concave; lower lip subelliptic, spreading, ca. 5 mm wide; lateral lobes ovate, ca. 3.5 mm wide. Ovary hirtellous. Nutlets ca. 2 × 1.8 mm, areole ca. 1/3 as long as nutlet, apically tuberculate, hirsute. Fl. Sep, fr. Sep-Nov.
* Dense tropical forests; ca. 400 m. Hainan.