Stems rather stiffly erect, 15-60 cm tall, simple or branched, sometimes especially on angles with spreading, bristlelike hairs of uneven length. Leaves broadly ovate to suborbicular, 1-2 cm, shortly hispid on veins and margins, base strongly cordate-clasping, margin rather shallowly crenate-dentate or sometimes entire, apex subacute or rounded. Flowers 1-3 in axil, sessile. Calyx lobes of upper flowers (later ones) 5, rarely 4, rigid, triangular-lanceolate, acuminate; lower flowers (earlier ones) smaller, with 3 or 4 shorter calyx lobes. Corolla blue or white, rotate, 8-20 mm wide; corolla on earlier flowers rudimentary. Capsule oblong to narrowly turbinate, 4-6 mm, tardily opening near middle. Seeds lenticular. Fl. and fr. Apr-Jul. 2n = 56.
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