Adenophyllum is a small genus of flowering plants in the tribe Tageteae, family Asteraceae (the daisy family), within the order Asterales. Commonly known as dogweeds, the genus comprises roughly ten to twelve species of herbaceous to subshrubby plants with a somewhat gangly habit and daisy-like or thistle-like flower heads bearing yellow or reddish ray and disk florets.
The genus is native primarily to the arid and semi-arid landscapes of the southwestern United States and northern Mexico, where species are most frequent in desert scrub and rocky terrain. Several species extend into Central America, and Adenophyllum porophyllum reaches as far as Cuba. Notable members include Adenophyllum cooperi (Cooper's dogweed) of California, Nevada, Arizona, and Utah; Adenophyllum porophylloides (San Felipe dogweed) of Baja California and adjacent U.S. states; and Adenophyllum porophyllum (poreleaf dogweed), the most widely distributed species, found across Mexico, Central America, Cuba, and Cochise County in Arizona.
Distribution
Adenophyllum is distributed primarily across the southwestern United States (California, Nevada, Arizona, Utah, New Mexico) and northern and central Mexico, with its center of diversity in arid desert habitats. Several species, including A. porophyllum, extend into Central America and Cuba.
Taxonomy Notes
The genus Adenophyllum belongs to the tribe Tageteae within the family Asteraceae, order Asterales. It was treated within the broader genus Dyssodia in older classifications; the current circumscription follows Strother's revision, which transferred most species under the recombined Adenophyllum epithet.
