Grindelia grandiflora, the manyray gumweed, is a North American species of flowering plants in the family Asteraceae. It is native to the south-central United States and north-central Mexico, in the states of Texas and Coahuila.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 309
Grindelia grandiflora grows in grasslands, scrublands, ditches, and roadsides, and along streambanks. It is an annual herb sometimes as much as 200 cm (80 inches or almost 7 feet) tall. The plant usually produces numerous flower heads in open, branching arrays. Each head has 17-26 ray flowers, surrounding a large number of tiny disc flowers.Flora of North America, Grindelia decumbens Greene, 1896. Hooker, William Jackson. 1852. : Curtis's botanical magazine 78: plate 4628 plus 2 subsequent text pages full-page colour illustration, diagnosis in Latin, commentary and figure captions in English
References