Description from Flora of China
Orthodon soochowensis (Matsuda) C. Y. Wu.
Stems 12-50 cm tall, much branched, sparsely pubescent. Petiole 2-7 mm, sparsely puberulent; leaf blade linear-lanceolate to lanceolate, 1.2-2.2(-3.5) cm × 2-4(-10) mm, adaxially puberulent, sparsely glandular, abaxially sparsely impressed glandular, sparsely minutely hispid on veins, base attenuate-cuneate, margin serrulate, apex acuminate. Racemes 2-5 cm, lax; bracts subcircular-ovate, 1.5-2.5 mm, caudate. Pedicel 1-3 mm, elongated in fruit, puberulent. Calyx ca. 3 × 2.1 mm, pilose, yellow glandular, throat pilose; upper teeth lanceolate, ca. 1.5 mm; lower teeth narrowly lanceolate, 2-2.2 mm; fruiting calyx dilated, base saccate in front. Corolla purple, 6-7 mm, puberulent outside, pubescent on lower lip inside and apical part of tube just below lower lip; upper lip erect. Posterior stamens slightly exserted, anterior 2 included. Style exserted. Nutlets brown, globose, ca. 1 mm in diam., netted. Fl. Jul-Oct, fr. Sep-Nov.
* Grassy slopes. Anhui, Jiangsu, Jiangxi, Zhejiang.