Senecio serra
 Senecio serra is a species of flowering plant in the aster family known by the common name tall ragwort. It is native to the western United States where it can be found in several types of habitat including sagebrush and woodlands. It is a perennial herb producing a single erect stem or a cluster of stems from a branched woody caudex. The plant can exceed two meters in height. It is hairless in texture with young plants sometimes appearing fuzzy and green to red-tinged in color.