Stems 10-20 cm, glabrous below, the upper part slightly puberulous. Leaves 2-5 by 1.5-2.5 cm, ovate to ovate-elliptic, acute, base cuneate, very sparsely hairy above, puberulous on the nerves beneath, margin dentate, ends of the veins callously protruding at the margin; nerves c. 6-7 pairs; petioles glabrous, 0.5-1.5 cm. Flowers inserted in the basal quarter of the midrib. Pedicels 5-6 mm, glabrous. Calyx tube c. 1.5 mm long, hairy, 10-ribbed; lobes 4 by 0.5 mm, linear, acute, with scattered hairs along the margin. Corolla tube 1 mm; posterior lobes 7-8 by 0.5 mm, 1/3 to 1/4 longer than the anterior ones, linear, acute, glabrous; anterior lobes 5-6 by 1.5-2.5 mm, oblong-ovate, acute, connate for about ⅔ of their length, inside papillose. Androecium 3 mm long; anthers 1 mm, posterior ones dorsally hairy. Capsule 6-7 by 3 mm. Seeds smooth.
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