Junonia grisea

Common Buckeye

A fresh buckeye is a thing to behold. It's the eyespots in particular that set the buckeye apart from our other common butterflies, interesting to us, confusing to predators. I've noticed that when buckeyes hold their forewings less than fully spread, the pattern above suggests the face of an owl. The underside is cryptic, but by lifting the forewing a bit, another eye reveals itself. Presumably this buys it time to fly off when a predator is within striking distance. This is how the buckeye wins: deception. Males patrol pathways and open areas and can be very common some years almost anywhere.

What we've called a buckeye in the U.S. is in fact not a single species. It took some serious genetic work (along with morphology, hosts, rearing experiments, etc.) to work it out, but what we have in southern California is Junonia grisea, formerly a subspecies of coenia. This recent journal article and this one as well are worth a deep dive. The name grisea was applied as a subspecies name in the 1998 Systematics book by Austin and Emmel (p.512); the type locality is South Pasadena.

Junonia (coenia) grisea - Common Buckeye
Junonia grisea in Poison Meadow (off Sherman Pass Road in the southern Sierras). July 19, 2012.
Junonia grisea - Common Buckeye
Ventral of the buckeye. Ballona Wetlands, October 28, 2005.
Junonia grisea - Common Buckeye
A visitor to the garden in Long Beach, showing the eye on the forewing underside. October 23, 2014.
Egg of Junonia grisea - Common Buckeye
A female was ovipositing on Plantago lanceolata on August 29th, 2023, near Lake Cuyamaca, so I took a couple home and got some micro-photos. This is probably around 200x magnification. I counted 13 ribs.
caterpillar of Junonia (coenia) grisea - Common Buckeye
This buckeye caterpillar was one of perhaps two dozen I found in Palm Desert on ornamental plantings of what looked like a penstemon. July 26, 2020.
caterpillar of Junonia (coenia) grisea - Common Buckeye
The larva of Junonia grisea is really beautiful close-up. From the egg above. September 14th, 2023.
pupa of Junonia (coenia) grisea - Common Buckeye
A larva I found in Palm Desert pupated the other day, so here's a photo. August 11, 2020.

©Dennis Walker