Lower leaves are petioled and disappear by the time the plant flowers. Upper leaves are sessile and become smaller towards the top of the plant. Mature Plants can grow up to three meters tall. They have a distinct mouse like odor, and long tapering roots.
Stems are much branched above and are coarse green with purple mottling.
Flower Flowers form many compound umbels which are 2.5 to 5 cm across. Invouvral bracts are small and lance shaped.