This is a perennial plant up to 3½' tall that branches occasionally. The light green stems have small purple streaks and scattered white hairs. The alternate or opposite leaves are up to 6' long and 3' across, becoming smaller as they ascend the stems. The leaves are ovate to lanceolate in shape and their margins have widely spaced teeth (or less often, they lack teeth). The upper leaf surface is olive or dark green with minute appressed hairs. The petioles are short and slightly winged.