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Perennial herb (3)6–20 cm. tall, glabrous except occasionally with scattered fine hairs on leaves and young stems, or finely, densely, minutely pubescent on stems only; stems procumbent, much branched, subterete.
Leaves opposite, ovate to lanceolate-ovate; lamina (4.5)7–20(37) x (3)4–10(22) mm., acute, subcuneate at base, thin, coarsely serrate-dentate; petiole about equalling lamina.
Capsule 4.5–6(7.5) x (1.5)2.5–3(4.5) mm., ellipsoid-conical including beak 1.5–2.25 mm. long, glabrous, pale yellow-brown.
Calyx 3–5.5 mm. long, lobes 2.5–5 mm. long, narrowly linear-triangular, subequal, mid-nerve prominent.
Pedicels 3–5(7) mm. long, filiform, decurved in fruit.
Bracteoles 0.5–1(2) mm. long, narrowly linear.
Flowers solitary or in 2(3)-flowered cymes.
