Annuals 5-10 cm tall. Stems erect, with laxly spreading branches, densely papillate. Basal leaves withered at anthesis, similar to stem leaves. Stem leaves shorter than internodes; petiole 2-3 mm, densely papillate; leaf blade lanceolate to ovate, 6-12 × 2.5-4 mm, larger toward stem apex, margin ciliolate, apex acute, midvein prominent. Flowers terminal, solitary, sessile or subsessile, 4merous. Calyx tubular, 1.3-1.6 cm; lobes ovate-triangular, 5-6 mm, margin densely ciliolate, apex acuminate and caudate, midveins strongly keeled and decurrent as conspicuous wings of calyx tube. Corolla purple, with blackish streaks, salverform, 2-3.5 cm; lobes ovate-elliptic, 4-5 mm, margin entire, apex obtuse; plicae ovate to suborbicular, 2-2.5 mm, margin entire or denticulate, apex obtuse to subtruncate. Stamens inserted at basal part of corolla tube, unequal, 2 longer and 1-1.2 cm, 2 shorter and 6-8 mm; anthers narrowly ellipsoid, 1.2-1.5 mm. Style filiform, 8-9 mm; stigma lobes linear. Capsules ovoid-ellipsoid to narrowly ellipsoid, 1-1.2 cm; gynophore 0.9-1.1 cm, slender, often twisted. Seeds dark brown, ellipsoid, 0.6-0.8 mm. Fl. and fr. Aug-Dec.
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