Herbs, perennial, with slightly woody rootstock; stems 20-60 cm tall, erect, unbranched to diffusely branched, quadrangular to narrowly winged, glabrous, ribs retrorsely aculeolate and scabrous to glabrous. Leaves in whorls of 4, sessile; blade drying thickly papery, broadly elliptic-oblong, ovate, or suborbicular, 1.5-3.5 × 0.8-1.9 cm, glabrous but scaberulous at least on upper surface, base rounded to cuneate and subpetiolate, margin aculeolate, apex obtuse or acute; principal veins palmate, 3-5. Inflorescences thyrsoid, narrowly paniculate, with terminal and axillary, many-flowered, long-pedunculate cymes; axes glabrous; bracteoles reduced, narrowly ligulate to lanceolate; pedicels 2-4 mm. Ovary ca. 1.5 mm, glabrous. Corolla greenish, yellowish, or whitish, rotate, ca. 5 mm in diam., glabrous, fused basal part 0.5-0.6 mm; lobes lanceolate or ovate, 1.6-2 mm, apex incurved. Immature mericarp berry ca. 3 mm in diam. Fl. Aug, immature fr. Oct.
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