Herbs erect, slender. Stems 40-65 cm tall, unbranched or few branched, pubescent or glabrescent. Petiole 1-2 cm, strigose; leaf blade ovate-lanceolate to elliptic, 4.5-6 × 1.6-2.8 cm, ± membranous, adaxially strigose to subglabrescent, abaxially strigose along veins, glandular, base cuneate to attenuate, margin double serrate, apex acuminate; lateral veins 8-or 9-paired. Racemes 3-9.5 cm, terminal or axillary, blackish or dark brown when dry; verticillasters 6 to many, 2-16-flowered; peduncle 1-2 cm, densely pubescent; bracts and bracteoles linear, nearly as long as pedicels, ciliate. Calyx urceolate-campanulate, 2.5-3 mm, sparsely hispid or subglabrous; teeth subulate, subequal. Corolla unknown. Nutlets black, subglobose, ca. 0.8 mm, smooth. Fr. Oct.
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