Description from Flora of China
Hancea cavaleriei H. Léveillé, Repert. Spec. Nov. Regni Veg. 9: 224. 1911.
Plants glabrous. Stems robust, grooved, slightly winged. Leaves 2-5 × 1-3 cm, adaxially dark green, abaxially pale, base long cuneate, decurrent, margin coarsely serrate except entire at base, apex acuminate. Bracts lanceolate, margin dentate. Flowers violet, in loose short racemes. Calyx conspicuously 8-veined, 2-lipped, upper lip more elongated, with 2 robust teeth, lower lip 3-toothed, with middle tooth larger than lateral teeth. Corolla exserted, ca. 10 × as long as calyx, tube erect or curved, lips circular, ± entire. Stamens and style nearly exserted. Nutlets conspicuously veined, ovoid, slightly scabrid. Fl. and fr. Sep (specimens not seen).
"The material is quite poor but mature calyces indicate that this species may be a Plectranthus." (D. R. McKean, Notes Roy. Bot. Gard. Edinburgh 40: 166. 1982). Perhaps it should be compared with Siphocranion.