Perennials, 30-60 cm. Stems erect, glabrous. Leaves opposite; petioles 25-70 mm; blades broadly ovate-deltate, 4-8 × 5-9 cm, (thin, delicate) bases truncate to subcordate, margins coarsely dentate, apices acute to acuminate, abaxial faces glabrous or sparsely puberulent. Heads clustered. Peduncles 1-3 mm, glabrous or sparsely puberulent. Involucres 3.5-4 mm. Phyllaries: apices acuminate, abaxial faces glabrous or sparsely puberulent. Corollas white, lobes glabrous or sparsely puberulent. Cypselae sparsely and evenly hirtellous. 2n = 34. Flowering Aug-Oct. Under overhanging sandstone (Pottsville formation) cliffs and ledges; 400-500 m; Ky., Tenn.