This species ranges from Alaska, south through the western portion of Canada and the northwestern quarter of the U.S., and east to North Dakota. The yellow morphs occur in the northern portion of Idaho, while the orange morphs occur mainly in the central and western portions of the state.
It frequents open areas, including meadows, prairies, sagebrush steppe, and forest openings.
Caterpillars feed on members of the pea family (Fabaceae), such as lupines
(Lupinus spp.), vetch (Vicia angustifolia), and white sweet clover
Adult: Butterflies drink flower nectar.
There is one generation of caterpillars each summer. Older caterpillars overwinter in a physiological state called diapause, and emerge in the spring to feed and pupate. Adults generally fly from May to August, with most flying during June and July.
Males actively patrol in search of receptive females. Females lay eggs singly on the leaves of host plants.
|Idaho Status:||Unprotected nongame species.|
G3; vulnerable to population decline and extinction.
Opler, P. A. and A. B.Wright. 1999. A Field Guide to the Western Butterflies. Second Edition. Peterson Field Guide Series. Houghton Mifflin Company, New York, New York, USA, 540 pp.
Pyle, R. M. 1981. National Audubon Society Field Guide to North American Butterflies. Alfred A. Knopf, Inc., New York, New York, USA, 924 pp.
Scott, J. A. 1986. The Butterflies of North America. Stanford University Press, Stanford, California, USA, 583 pp.
Stanford, R. E. and P. A. Opler. 1993. Atlas of Western U.S.A. Butterflies (Including Adjacent Parts of Canada and Mexico). Published by authors, Denver, Colorado, USA, 275 pp.