Aphanostephus ramosissimus is a North American species of flowering plants in the family Asteraceae, with the common name plains lazydaisy. It is native to the southwestern and south-central United States, the states of Arizona, New Mexico, Texas, and Oklahoma, as well as to central and northern Mexico as far south as Puebla and Michoacán.
Aphanostephus ramosissimus is an annual herb up to 45 cm (18 inches) tall. It produces multiple flowers, each containing a few dozen long, thin, white petals that radiate from a yellow central disc.