Strongly seasonally dimorphic, this is our only Polygonia found on the floor of the Central Valley as well as in the hills to mid-elevation. The wood-brown underside is diagnostic. Virtually limited to riparian habitat and tule marsh, near its host (Urtica holosericea, the common tall, native stinging nettle), but usually scarce to rare, and in retreat from civilization. Adults hibernate; a new brood in late spring-early summer and another in August-September (hibernators). Males territorial in sunflecks at or near ground level.