Roots, stems, leaves, pollen, flowers, and fruits. Small blisters may appear in a few hours or days. Stiffness, profuse perspiration and muscular trembling. Tall, broad-leaved herbs growing up to 7 feet in height from a thick rootstock. Leaves are large, alternate, pleated, clasping, and parallel veined.
Flowers are numerous and white to greenish in large terminal clusters.
Fruit is 3-lobed.