Didymocarpus depressus (J. D. Hooker) W. Y. Chun, Sunyatsenia 6: 298. 1946.

Perennials, stemless. Rhizome internodes inconspicuous. Leaves basal, opposite; petiole ca. 8 X 6 mm; leaf blade broadly ovate or elliptic to obovate, ca. 10 X 6 cm, papery, adaxially densely puberulent, eglandular, abaxially velutinous, base cuneate, margin shallowly crenate, apex obtuse to rounded; lateral veins ca. 4 on each side of midrib, conspicuous. Cymes ca. 4-flowered; peduncle shorter than leaves; bracts 2. Calyx 5-sect from base; segments slightly unequal, narrowly linear, ca. 7 X 1 mm, outside puberulent and glandular puberulent, margin entire, apex attenuate. Corolla purple, ca. 3 cm, outside sparsely pubescent, inside glandular puberulent below stamens; tube funnelform-tubular, ca. 2.3 X 0.8 cm; adaxial lip ca. 6 mm; abaxial lip ca. 7 mm. Filaments ca. 1.3 cm, glabrous; anthers fused by entire adaxial surfaces, ca. 2.5 mm, glabrous; staminodes 3, central ca. 2 mm, laterals ca. 6 mm. Pistil nearly as long as corolla tube; ovary puberulent and sparsely glandular puberulent. Stigma obovoid, 2-lobed. Fruit and seeds unknown.

This species is known only from the type specimen, which has only two detached leaves and a corolla (without stamens). The plate in the protologue is excellent, but does not show inflorescence characters.

After publication of the family treatment for the Flora of China, this was treated as Primulina depressa (Hook. f.) Mich. Möller & A. Weber (Taxon 60: 781. 2011).

* N Guangdong.