Description from Flora of China
Orthodon grosseserrata (Maximowicz) Kudo.
Herbs annual. Stems 10-60(-70) cm, erect, finely retrorse puberulent, glabrescent, shiny green, branches spreading. Leaves ovate, base attenuate, margin 3-5-dentate, sometimes with 1 or 2 small teeth, apex acute. Racemes short; bracts very small, ca. 2.5 mm, lanceolate, longer than pedicels. Calyx 2-3 mm, pubescent, glabrescent in fruit, shiny glandular; teeth of upper lip acute, middle tooth shorter; lower teeth narrower, apex acuminate. Corolla 3.5-4 mm; upper lip ca. 2 × as long as lower lip, rounded. Staminodes with distinct anther cells. Nutlets shorter than calyx tube, subglobose, base slightly acute, loosely netted, of 1 color (specimens not seen: description based on Volkova, Fl. U.S.S.R. 21: 633. 1954).
Anhui, Jiangsu, Jilin, Liaoning [Japan].