Herbs, perennial, erect to weak, up to 50 cm tall. Stems obtusely 4-angled, usually branched, ± retrorsely aculeolate on angles or glabrous. Leaves in whorls of 6, sessile; blade drying papery, lanceolate, 15-35 × 2.5-6 mm, glabrous, adaxially smooth or scaberulous along midrib and near margins, abaxially sparsely retrorsely aculeolate along midrib, base cuneate, margins sparsely to densely retrorsely aculeolate, flat to thinly revolute, gradually narrowed into acute to acuminate apex; vein 1. Inflorescences terminal and axillary, cymes many flowered; peduncles glabrous, smooth; bracts none or few, 1-2 mm; pedicels 1-4 mm. Ovary obovoid, 0.5-0.8 mm, glabrous. Corolla white to greenish, rotate, 2.5-3 mm in diam., lobed for 2/3 or more, glabrous; lobes 4, triangular-spatulate, acute to shortly acuminate. Mericarps ovoid, ca. 1 mm, glabrous, smooth or minutely granulose. Fl. Jun, fr. Aug.
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