Plants erect, 1–1.5(–2+) m. Rootstock: inner bark yellow. Stems 1–30+ from base, glabrous. Leaves often appearing subopposite to semiwhorled proximally, gradually smaller distally, simple to asymmetrically laciniate-pinnate or shallowly pinnatifid to incised-trifoliolate, lobes deeply cleft; petiole 2–4 cm; blade lanceolate to ovate, 6–20 × 1–13 cm, margins coarsely serrate, apex acuminate to long-acuminate, surfaces glabrous. Flowers: staminate: calyx 2 mm, lobes slender, 0.2–1 mm; stamens borne on rim of calyx, nearly sessile or filaments to 1 mm; anthers yellow, 3–5 mm; bisexual: hypanthium 5–8 mm; calyx lobes narrow, 1–2 mm; ovary usually 3-angled; pistillate: rare, similar to bisexual flowers. Capsules ovoid-oblong, 7–11 mm, apex truncate. Seeds ellipsoid, 0.8–1 mm, pitted in longitudinal rows.
|Durango root F|