Description from Flora of China
Orthodon longibracteatus C. Y. Wu & Hsuan, Acta Phytotax. Sin. 10: 232. 1965.
Stems 30-50 cm, retrorse minutely hispid on angles and nodes, much branched. Petiole 6-12 mm, minutely hispid; leaf blade obovate to rhombic, 1.6-3.3 × 0.9-1.6 cm, papery, olive green, glabrous, abaxially sparsely glandular, base attenuate, decurrent, margin crenate or crenate-serrate on upper half, apex obtuse. Racemes 6-11 cm; bracts ovate-lanceolate to lanceolate, 4-6.5 × 0.8-3 mm, much longer than pedicels, lower bracts sometimes leaflike. Calyx ca. 2.7 × 2.2 mm, dilated to 6 × 5 mm in fruit, puberulent, retrorse minutely hispid on veins, sparsely glandular; posterior teeth obtuse triangular, middle tooth minute; anterior teeth lanceolate, slightly longer. Corolla reddish or whitish, slightly longer than calyx, without hairy annulus inside. Nutlets yellow-brown, subglobose, ca. 1.5 mm in diam., loosely netted. Fl. Sep-Oct, fr. Nov.
* Foothills, riverbanks; ca. 500 m. Guangxi, Zhejiang.