About Dieteria asteroides Torr.
Dieteria asteroides, commonly known as the fall tansyaster, is a North American plant species belonging to the sunflower family. It is native to the southwestern United States (including California, Arizona, Nevada, New Mexico, Colorado, and Utah) and northern Mexico (including Chihuahua, Sonora, and Baja California). Dieteria asteroides is a biennial or perennial herb that grows a woody taproot. It typically forms a clump that holds several stems. Within its flower heads, the ray florets are either white or purple, and are functionally female, while the disc florets are yellow and bisexual. There are three recognized varieties of this species. Dieteria asteroides var. asteroides is found in California, Arizona, Nevada, New Mexico, Chihuahua, and Sonora. Dieteria asteroides var. glandulosa (B.L.Turner) D.R.Morgan & R.L.Hartm. grows in Arizona, Nevada, New Mexico, and Utah. Dieteria asteroides var. lagunensis (D.D.Keck) D.R.Morgan & R.L.Hartm. occurs in Baja California, and the Laguna Mountains in San Diego County, California.
