Mules-ears is a north American native perennial that is from the north western states. It is a cool-season scented herbaceous perennial, with stems up to 32 inches (80 cm) tall. The leaves are alternate and are 8 to 16 inches (20-40 cm) long and 2 to 6 inches (5-15 cm) wide. Wyethia amplexicaulis has large, round, shiny leaves produced on the stems. Established plants normally have several yellow, sun-flower like flower heads but flower heads may occasionally be solitary if the growing conditions are not suited well for this highly adaptable species. The fruits are large achenes, which are easy to handle and sow, producing a good sized seedling. Mules-ears is drought tolerant, with a stout taproot up to 9 inches (22 cm) in circumference. The taproot may reach depths of over 6 feet (180 cm). Strong lateral roots run 3 to 4 feet (90-120 cm) from the main root. Blooms in late spring, grows best in full sun.