Plants dioecious. Stems 60–150 cm with glabrous foliage. Leaves sessile, 3–5 times ternate; ultimate leaflets 2–3 cm long, acutely 3-lobed, leathery, distinctly veined, glaucous and sparsely hairy beneath with revolute margins. Inflorescence compound bracteate panicles. Flowers with whitish sepals 3–4 mm long; anthers ca. 2 mm long, much shorter than the tapered filaments. Fruits ca. 10 pubescent, spreading achenes, the body 2–4 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).