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Herb, 20-60 cm tall, unbranched or sparingly branched; stemn terete at the base, becoming 4-angulate above, inconspicuously winged. Leaves considerably exceeding the internodes; the lamina narrowly ovate to ovate-elliptic, acuminate to subacute at the apex, gradually attenuate and amplexicaul at the base, charta-ceous, with 3(-5) strongly ascending inconspicuous veins. Flowers in dense, axillary, verticillate clusters, usually 4-8 flowers per cluster, 6-8 mm long, white, sessile, bracteate, the bracts linear, 4-6 mm long; calyx 4-6 mm long, urceolate, the lobes subulate to narrowly linear-lanceolate, 2-4 mm long, flaring to re-curved at the apex, the margins membranous; corolla 6-8 mm long, ? infundib-ular, white or yellow, the lobes ovate, narrowly acute at the apex, 1.5-2 mm
long and 0.5-1 mm broad at the base; stamens included, the filaments ca. 1 mm long, flattened, the anthers ca. 1.5 mm long, long-apiculate, bilobate at the base; pistil 2.6-2.8 mm long, ovary 1-locular, ellipsoid, 1.6-1.8 mm long, the cylindrical style ca. 1 mm long, the stigma ca. 0.5 mm in diameter. Capsules ellipsoid, 3.5-4 mm long, beaked (persistent style), surrounded by the marcescent calyx and corolla; seeds flattened.
