Erect herb. Stems up to 50 cm tall; yellow-green. Leaves 25-70 x 4-20 mm, lanceolate to ovate-lanceolate, apex acute, base sessile, clasping the stem above. Inflorescence a spreading panicle, with the flowers borne in 3-7-flowered dichasia. Pedicel slender. Calyx 10-15 (-16) mm, cylindric, slightly contracted below the teeth, glabrous; teeth triangular, with a scarious margin and apex with 5 Prominent veins and yellowish-green wings between them. Petals pink, 15-20 nun, limb entire or irregularly dentate above, claw partially exserted. Capsule 8-10 mm, subglobose, included in the calyx. Seed c. 2 mm diameter, subglobose, black.