Herbaceous perennial resembling rhubarb favors moist to wet areas. Roots have a tuberous base with extensive, fleshy creeping rhizomes. Rhizomes are blackish on the outside with white interiors.
Large, heart shaped leaves and thick fleshy stalks, span up to 1 meter across. Plants resemble rhubarb. Leaves do not fully emerge until after flowering has occurred.
Pinkish flower stalks, composed of bundles of tiny pink radial flowers, emerge from underground in early spring. Blooming occurs before the leaves fully emerge and expand. Male and female flowers typically appear on different spikes.
Seeds are attached to feathery pappus (plumes of fine white bristles). In some conditions, seeds are sterile.
Invades wetlands, forests, forest edges, bogs, marshes, and other semi-shaded moist areas. It grows quickly and shades out native species.
Native to Europe.
Meadows, fields, disturbed areas, riverbanks, lakeshore
Blooming occurs in spring before full leaf out. Male and female flowers typically appear on different spikes.
Butterbur Sweet-coltsfoot, 5382461, William M. Ciesla, Forest Health Management International, CC Non-com 3.0 http://www.ipmimages.org/browse/detail.cfm?imgnum=5382461
Butterbur flower, 5382462, William M. Ciesla, Forest Health Management International, CC Non-com 3.0, http://www.ipmimages.org/browse/detail.cfm?imgnum=5382462