Roots fleshy. Stems often single, erect, 30-100 cm tall, usually simple, branching rarely or more in response to damage, usually glabrous, sometimes sparsely hirsute below. Leaves all subsessile, or lower leaves with petiole up to 2 cm; blade ovate, lanceolate, or elliptic, 3.5-7 × 1-3 cm, abaxially usually glabrous, sometimes sparsely hispidulous along veins, adaxially glabrous or sparsely hispidulous. Cymes distantly separated from each other, sometimes gaps up to 10 cm. Calyx glabrous; tube obovoid to obconic, longer than broad; lobes 5-10 mm. Corolla blue or purple; lobes equal to calyx lobes in length or slightly longer. Style much shorter than corolla. Young capsule narrowly obovoid, 7-10 × 3-5 mm. Fl. Jul.
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