About Coreocarpus arizonicus (A.Gray) S.F.Blake
Coreocarpus arizonicus, commonly called the little lemonhead, is a North American flowering plant species belonging to the daisy family. It is native to northwestern Mexico and the southwestern United States. Confirmed populations of the species have been found in southern Arizona's Pima, Santa Cruz, and Cochise Counties, as well as the adjacent Mexican states of Sonora, Chihuahua, Sinaloa, and Baja California Sur. This plant is a branching perennial subshrub that can reach up to 120 cm (48 inches) in height. It typically produces multiple flower heads. Each flower head contains yellow disc florets, plus ray florets that can be white, purplish, yellow, or orange; in some cases, ray florets are entirely absent. The species grows in open locations along streams and within mountain canyons. Five varieties of Coreocarpus arizonicus are recognized: Coreocarpus arizonicus var. arizonicus, found in Arizona, Sonora, Chihuahua, and Baja California Sur; Coreocarpus arizonicus var. filiformis (Greenm.) S.F.Blake, found in Sinaloa; Coreocarpus arizonicus var. macrophyllus Sherff, found in Chihuahua; Coreocarpus arizonicus var. pubescens (B.L.Rob. & Fernald) S.F.Blake, found in Sonora; and Coreocarpus arizonicus var. sanpedroensis (E.B.Sm.) B.L.Turner, found in Sonora.
