Annuals 4-8 cm tall. Stems ascending to erect, branched from base, papillate. Leaves usually widely spaced; petiole tube 2-2.5 mm, papillate on margin and abaxially; leaf blade suborbicular, 5-8 × 3-4 mm, shorter than internodes, margin cartilaginous and smooth or ciliolate, apex rounded and cuspidate, midvein abaxially distinct. Pedicel 6-8 mm, surrounded by upper leaves, sometimes papillate. Calyx tubular to narrowly obconic, 1-1.2 cm; lobes triangular, 2-3 mm, margin narrowly membranous and smooth, apex acute and cuspidate, midvein strongly keeled and decurrent into conspicuous wings of calyx tube. Corolla dark blue to blue-purple, sometimes with greenish yellow base, outside tinged blackish, inside with short blackish stripes in throat, tubular to narrowly funnelform, 2-2.2 cm; lobes ovate, 3-5 mm, margin entire, apex obtuse; plicae ovate, 2.5-4 mm, margin erose, apex obtuse. Stamens inserted at middle of corolla tube, equal; filaments 5.5-6.5 mm; anthers ellipsoid, 1.2-2 mm. Style 1.2-2 mm; stigma lobes oblong. Capsules cylindric to narrowly ellipsoid, 1-1.2 cm; gynophore to 7 cm. Seeds light brown, ellipsoid, 1-1.2 mm, edges several, irregular, and spongy. Fl. and fr. Aug-Oct.
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