Annuals 3-20 cm tall. Stems dark purple, ascending to erect, branched from base, densely papillate. Petiole tube 2-2.5 mm, papillate adaxially and on margins; leaf blade ovate-elliptic to ovate, 0.9-1.5 cm × 3-5 mm, abaxially glabrous, adaxially densely and minutely papillate, base obtuse, apex acuminate to acute and cuspidate, midvein distinct. Pedicel dark purple, 2-10 mm, densely papillate. Calyx narrowly obconic, 6-10 mm; lobes spreading to recurved, spatulate to ovate-lanceolate, 2-4 mm, base narrowed, apex obtuse and mucronate, midvein prominent. Corolla pale yellow to yellow, with dark spots in throat, obconic, 0.9-2.3 cm; lobes broadly ovate, 1.5-5 mm, margin entire, apex obtuse and mucronate; plicae broadly ovate, 1.2-4 mm, margin entire or erose, apex cuspidate to obtuse. Stamens inserted at middle of corolla tube, equal; filaments 5-7 mm; anthers narrowly ellipsoid, 2-3 mm. Style 2-3 mm; stigma lobes linear. Capsules narrowly obovoid to obovoid, 5-7 mm; gynophore to 2 cm, stout. Seeds dark brown, ellipsoid, 1-1.3 mm. Fl. and fr. Jul-Oct.
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