A herb with woody base; stems below erect and rigid, above twining, 3 ft. long, sparingly branched, finely pubescent and armed with stinging bristles; leaves long-petioled, membranous, triangular-ovate, acute, base cordate, margin strongly and rather coarsely serrate or duplicate-serrate, 1 1/2-3 in. long, 1-2 1/2 in. wide, uniformly sparingly pubescent throughout, and setose or bristly on the nerves on both surfaces; petiole minutely puberulous and sparingly bristly, 1-2 1/2 in. long; stipules lanceolate, reflexed, glabrous, 1/6 in. long; racemes lateral, leaf-opposed, 1-sexual, male 3-4 in. long, with numerous flowers in 3-flowered cymules below, above with flowers solitary to their bracts but with the bracteoles upraised on the pedicel; peduncle and rhachis finely pubescent; male bracts linear-lanceolate, 1 1/2 lin. long, reflexed; male calyx 3-partite; lobes ovate, apiculate; stamens 3; anthers subincurved; female flowers and fruit not seen.
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