Plants perennial. Rhizome slender and long. Stems ascending or erect, usually dark purple, less frequently straw-colored, up to 35 cm, angular when dry, subglabrous or sparsely retrorsely hispid, sometimes branched. Middle cauline leaves largest, obovate-elliptic or elliptic, 12-35 × 4-12 mm, apex obtuse; lower cauline leaves gradually attenuate into short petiole; upper cauline leaves sessile; all leaves sparsely serrate, hispidulous near margins or along veins. Flowers solitary, terminal, pendulous. Hypanthium obconic, densely hirsute or granulate-glandular; calyx lobes subulate, 5-7 × ca. 1.5 mm, both sides glabrous, margin serrate and hispidulous-ciliate. Corolla blue or blue-purple, broadly campanulate, 14-20 mm, glabrous; lobes equaling or slightly longer than tube. Style ca. 1 cm; stigma 3-lobed. Fl. Jul.
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