Aruncus Linnaeus. Subfamily: Amygdaloideae. Tribe: Spiraeeae.
A genus of 2-3 species, perennial herbs, of temperate North America and Europe.
ID notes: Aruncus dioicus can be distinguished from the superficially closely similar Astilbe biternata by the following characteristics: trichomes of foliage not glandular (vs. glandular in Astilbe), stamens 20 (vs. 10), carpels 3-4 (vs. 2), seeds < 1.5-2 mm long (vs. ca. 4 mm long), terminal leaflets usually unlobed (vs. terminal leaflets usually trilobed).