Grindelia arizonica, the Arizona gumweed, is a North American species of flowering plants in the family Asteraceae. It is native to the southwestern United States and northern Mexico, in the States of Coahuila, Chihuahua, Arizona, New Mexico, Utah, Texas, and Colorado.Biota of North America Program 2014 county distribution mapNesom, G.L. 1990. Studies in the systematics of Mexican and Texan Grindelia (Asteraceae: Astereae). Phytologia 68(4): 303–332 distribution map on page 308
Grindelia arizonica grows in prairies and thickets, and along streambanks. It is a perennial herb up to tall. The plant usually produces numerous flower heads in open, branching arrays. Each head has 8-26 ray flowers, although some individuals have no rays. In the center of the head, there are a large number of tiny disc flowers.Flora of North America, Grindelia arizonica A. Gray, 1881.
References
External links Southwest Colorado Wildflowers photos Vascular Plants of the Gila Wilderness