Plants medium-sized to occasionally very large, yellowish grass green to dark green, often reddish brown on exposed parts of stems and petioles. Stems glabrous or appressed-hairy proximally, glabrous distally. Leaves: stipules translucent, usually suffused with red proximally, translucent to pale green distally, lobes pale green; petiole glabrous or sparsely to densely appressed-hairy; blade reniform-orbiculate, 7–9(–11)-lobed, margins flat or slightly undulate, basal sinuses narrow or wide, middle lobes as long as to longer than their half-widths, rounded to triangular-ovate; incisions absent; teeth ± connivent, slightly concave near apex, strongly asymmetric, apex subacute or obtuse, abaxial surface with nerves hairy throughout or in distal 1/2 only, internerve regions glabrous, adaxial glabrous or slightly hairy near margins, rarely (late-season leaves) hairy on folds. Inflorescences: primary branches glabrous. Pedicels glabrous. Flowers: epicalyx bractlet lengths 0.5 times sepals (narrower); hypanthium glabrous. Achenes exserted from discs.
Phenology: Flowering Jul–Aug.
Elevation: 0–100 m
Introduced; N.B., Nfld. and Labr. (Nfld.), Que., Alaska, Europe.