The stems are usually winged with well-developed, alternate, flat, stem leaves. The leafy inflorescence contains several heads of both ray and disc flowers. The flower head contains perfect, yellow flowers. The diagnostic features of sneezeweed are its winged stems and bent back ray flowers with 3 teeth. In flower from August to October.
Sneezeweed is common in wet to wet-mesic prairies and other inland fresh meadows.
It is often seen along streambanks.