Description from Flora of China
Annuals 15-40 cm tall. Roots yellow, ca. 5 mm in diam. Stems erect, 1-2 mm in diam., subquadrangular, branched. Basal leaves withered at anthesis. Stem leaves sessile, oblong, 1.5-3 × 0.6-1 cm, base obtuse and subamplexicaul, margin ciliolate, apex acute to rounded, veins 3. Inflorescences panicles of cymes, many flowered, narrow. Flowers 5merous. Pedicel erect, 2-15 mm, slender. Calyx tube ca. 0.5 mm; lobes linear-lanceolate, 2-5 mm, margin ciliolate, apex acuminate, midvein distinct. Corolla white or pale yellow, 3-5 mm in diam., tube ca. 0.5 mm; lobes ovate-lanceolate, 4-6(-7) mm, apex acuminate and apiculate. Nectaries 2 per corolla lobe, cupular, with a narrow scale and many ca. 1 mm fimbriae. Filaments flattened, 2-2.5 mm; anthers ellipsoid, ca. 1.5 mm. Ovary ovoid-ellipsoid, 4-5 mm, with many ovules. Style indistinct; stigma lobes capitate. Fl. Aug.
* Hillsides; ca. 2500 m. Sichuan (Muli Zangzu Zishixian), Yunnan (Zhongdian Xian).