Annuals 15-25 cm tall. Stems erect, branched or rarely simple, glabrous. Basal leaves withered at anthesis. Stem leaves widely spaced; leaf blade ovate to cordate, 3-7 × 3-6 mm, shorter than internodes, abaxially scabrous pubescent on veins, base rounded, margin serrulate, apex acute, veins 3. Flowers terminal, solitary, sessile. Calyx campanulate, 1.8-2.2 cm, broadly winged; lobes linear-triangular, 0.9-1.1 cm, apex acute, midvein outside strongly keeled and decurrent into wings of calyx tube. Corolla pale purple, broadly tubular to funnelform, 2.3-2.5 cm; lobes ovate, 6-8 mm, margin entire, apex obtuse; plicae triangular, ca. 2 mm, apex long fringed. Stamens inserted at basal part of corolla tube, unequal, 2 longer and 1.3-1.5 cm, 3 shorter and 5-6 mm; anthers narrowly ellipsoid, 2-2.5 mm. Style 1-1.2 cm; stigma lobes narrowly ellipsoid. Fl. and fr. Oct.
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