Annuals, erect, 7-10 cm. Stems simple, with 2-4 nodes, conspicuously ribbed, subglabrous, with or without adventitious roots on first node. Petiole 4-5 mm, narrowly winged; leaf blade ovate to ovate-elliptic, 1.2-2.5 X 0.6-1.2 cm, subglabrous to sparsely hirtellous, base rounded to broadly cuneate, margin appressed serrate, apex acute to obtuse. Inflorescences pseudo-umbellate; bracts 2 pairs, decussate or unequally whorled. Flowers open, cleistogamous, or sterile. Calyx campanulate, 5-ridged, upper ridge narrowly winged; lobes often irregular in fruit, upper lobe narrowly ovate, smaller than lower lobe, margin entire, apex acuminate. Corolla white. Filaments of anterior stamens unappendaged. Ovary glabrous. Style persistent; stigma lamellate. Capsule ellipsoid to oblong, slightly shorter than persistent calyx.

Forests; ca. 1400 m. Yunnan (Jinghong Xian) [Thailand].