The horizontal plates of piths are most easily visible by cutting the stem base lengthwise. The alternate leaves are pinnately 2-3 times compound. The leaves of most species are lanceolate, 2-5 inches long, and sharply toothed. The base of the ong petioles clasp the stem. Umbels measure from 2 to 8 inches across and become somewhat spherical in fruit.
Fruits are ovoid and ribbed on the outer surface.
New growth begins from tubers as well as from seeds.