Much like H. americana and hybridizing, but maintaining its identity; lvs 3-lobed or occasionally 5-7-lobed, deeply cordate at the base, the lobes broad, acute; length of the lf blade about 3 times the distance from the summit of the petiole to the sinuses; bracts acute, about equaling the sep. Similar habitats; Que. to Minn., s. to Ga., Ala., and Mo. Mar., Apr. (H. nobilis var. acuta)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.