Herbs, perennial, often somewhat caespitose from elongated, much branched, and ca. 1 mm thick rhizomes. Stems erect, to 60 cm tall, 4-angled, little branched, glabrous and smooth, only sometimes puberulent at nodes. Leaves in whorls of up to 6, subsessile; blade drying papery, discolorous (more pale abaxially), lanceolate or narrowly lanceolate, (15-)25-60(-70) × (3-)5-10(-12) mm, glabrous, smooth or mostly somewhat antrorsely ciliolate on margins and midrib, base acute to cuneate, apex acute to acuminate; vein 1. Inflorescences terminal, 8-16 × 8-16 cm, corymbiform to paniculate, lax, with several-to many-flowered cymes; axes glabrous, smooth with few lanceolate, 1-3 mm long bracts and 1.5-6 mm long pedicels. Ovary obovoid, ca. 1 mm, glabrous. Corolla white, drying often yellowish brown, campanulate to funnelform, ca. 4 mm in diam., glabrous, lobed for ca. 1/2; lobes 4, triangular, acute. Fruit on elongating pedicels with ellipsoid, ca. 2 mm, glabrous and smooth mericarps. Fl. Jun-Jul, fr. Aug-Sep.
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