Annuals 1-5 cm tall. Stems erect, slender, simple or branched from base. Basal leaves withered at anthesis. Stem leaves with petiole flattened, 2-7 mm; leaf blade elliptic, ovate-oblong, or broadly ovate, 2-7 × 1.5-4 mm, base narrowed to abruptly contracted, apex obtuse to rounded. Inflorescences 1 to many flowered. Pedicel usually arcuate, filiform, to 2.7 cm. Flower 4merous, variable in size, terminal ones 2-4 × larger than others. Calyx 1.5-6 mm; lobes dimorphic, 1 pair ovate-elliptic and ca. 2 mm wide, another pair narrowly lanceolate and ca. 1 mm wide, base narrowed, apex acuminate and apiculate. Corolla pale purple, tubular, 2.5-10 mm; lobes lanceolate, 1.5-5 mm, apex acute and apiculate, densely papillate outside. Nectaries 8, green, oblong. Stamens inserted at middle of corolla tube; filaments white, ca. 1.5 mm; anthers ellipsoid, ca. 1 mm. Ovary ovoid-ellipsoid, to 6 mm. Style linear; stigma lobes oblong. Fl. Oct.
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