Erect herb, 60–120 cm. high; stems quadrangular, sulcate, more or less densely pubescent with brownish hairs.. Leaves generally heteromorphic, lower ones large, long-petiolate (8–20 cm.) ovate-cordate or 3-lobed, 8–13 cm. long, 9–18 cm. broad, cordate at the base, upper leaves smaller, 0.5–5 cm. petiolate, ovate to ovate-lanceolate, 2–5 cm. long, 0.7–4 cm. broad, sub-truncate or cuneate at the base, inconspicuously to coarsely serrate on the margin, acuminate at the apex, pubescent on both sides more densely so below and on upper leaves; mucilage glands present but not conspicuous.. Flowers pale pink or pinkish mauve; bracteoles conspicuous, pale brown, rather membranous, narrowly lanceolate, pubescent.. Calyx ultimately deciduous; lobes narrowly lanceolate, acuminate, rather similar to the bracteoles, about 5 mm. long.. Corolla thinly pubescent and glandular outside, 2.5–2.8 cm. long, about 1 cm. broad at the throat.. Filaments glabrous.. Ovary adpressed-pubescent, narrowly oblong, about 6 mm. long, gradually narrowed into the style.. Capsule shortly pubescent, oblong-quadrangular, 4-grooved, 2.7–3.1 cm. long (incl. beak), about 0.5 cm. broad, unilaterally gibbous at the base, rather abruptly narrowed into a short beak at the apex up to 5 mm. long.. Seeds not winged, about 3 mm. long, 2 mm. broad, faces foveolate, sides deeply pitted, margins sharply angled.
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A herb. It grows 60-120 cm tall. The stems are 4 sided and hairy. The leaves vary. Lower leaves are large and oval or heart shaped and 8-13 cm long by 9-18 cm wide. The upper leaves are smaller. They are oval and 2-5 cm long by 1-4 cm wide. They have teeth along the edge. The flowers are pale pink or mauve. The fruit capsule has short hairs and has 4 grooves. They are 2.7-3.1 cm long and 0.5 cm wide. The seeds are 3 mm long by 2 mm wide.
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