is a genus of flowering plants in the sunflower family
. Plants of this genus are known generally as snakeweeds
. There are about 25 species found in North and South America. These plants contain chemical compounds which can be toxic to livestock and some are considered weeds. They bear small yellow daisylike flowers.
- Everitt, J.H.; Lonard, R.L., Little, C.R. (2007). Weeds in South Texas and Northern Mexico. Lubbock: Texas Tech University Press. ISBN 0-89672-614-2