Herbs, perennial, erect, 20-60 cm tall. Stems with 4 thickened angles, glabrous and smooth, hispidulous only at nodes. Leaves in whorls of 4, subsessile or petiole to 2 mm; blade drying mostly somewhat leathery, remaining ± green, oblanceolate to ovate-lanceolate, sometimes even narrowly elliptic or ovate, 20-80 × 4-20 mm, length/breadth index (2-)3-5(-6), strigillose or hispidulous at least along veins to glabrescent, sparsely to densely punctate-to striate-glandular abaxially, base acute to rounded, margins flat to thinly revolute, antrorsely ciliolate to hispidulous, apex subacute to acute, but hardly concave and long acuminate; principal veins 3, palmate. Inflorescences paniculiform, to 25 × 15 cm, cymes in uppermost leaf axils and terminal, many flowered, lax and often somewhat divaricate; peduncles smooth and glabrous or hispidulous at nodes; bracts oblanceolate to narrowly elliptic, 1.5-3 mm; pedicels 1.5-3 mm. Ovary subglobose to obovoid, ca. 0.8 mm, smooth, glabrous. Corolla white to ± purplish, rotate, 2-2.5 mm in diam., glabrous; lobes 4, ovate, acuminate. Mericarps subglobose to obovoid, ca. 2.5 mm, glabrous and smooth. Fl. May-Jul, fr. Aug-Sep.
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