A herbaceous perennial with showy, plumelike, white flower clusters. Male and female flowers are on separate plants, in open panicles with very small, 5-petaled flowers. Male flowers have noticeable stamens. Flowers white or cream-colored, turning tan with age. Blooms May–July. Leaves are nearly 2 feet long, compound, the leaflets in threes or fives, both lateral and terminal on long stems; leaflets are oblong, sharply pointed, finely toothed with very short stems.