California-buckeye-host
Guides
Celastrina echo cinerea
Southwestern Azure
Celastrina echo cinerea, the Southwestern Azure, is a subspecies of the echo azure butterfly in the family Lycaenidae. It is one of several subspecies within the Celastrina echo species complex, which is found across western North America. The species is known generally as the echo azure or western azure. Host plant associations include Aesculus californica (California buckeye) in the Bay Area region.