North American Butterflies and Moths List

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Butterflies of North America

Butterflies of Oregon

Western White (Pontia occidentalis)
JPG -- species photo

Western White (Pontia occidentalis [Reakirt])

Wing span: 1 1/2 - 2 1/8 inches (3.8 - 5.3 cm).

Identification: Upperside of forewing has marginal markings that are lighter than the submarginal stripe. Below, forewing tip and hindwing have veins outlined with gray-green. Short-day spring and fall forms have more prominent markings.

Life history: Males patrol hilltops and ridges for receptive females. Females lay eggs singly on host plants. Caterpillars will feed on leaves but prefer buds, flowers, and fruits. Chrysalids hibernate.

Flight: One flight from June-July in far north; two flights from May-August in the south.

Caterpillar hosts: Flowers and fruits of various members of the mustard (Brassicaceae) family.

Adult food: Flower nectar.

Habitat: Mountain peaks, slopes, hilltops, railroad yards, open plains, roadsides.

Range: Alaska south to central California, northern Arizona and northern New Mexico; east to North Dakota and central Ontario.

Conservation: Not usually required.

Management needs: None noted.

The Nature Conservancy Global Rank: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

References:


Opler, P. A. and V. Malikul. 1992. A field guide to eastern  butterflies. 

     Peterson field guide #4. Houghton-Mifflin Co.,  Boston. 396 pages, 

     48 color plates.



Scott, J. A. 1986. The butterflies of North America. Stanford  University 

     Press, Stanford, Calif. 583 pages, 64 color plates.



Tilden, J. W. 1986. A field guide to western butterflies.  Houghton-Mifflin 

     Co., Boston, Mass. 370 pages, 23 color plates.

Author: Jane M. Struttmann

State and Regional References:


Dornfeld, E. J. 1980. The Butterflies of Oregon. Forest Grove, 	Ore., Timber 

     Press.



Hinchliff, J. 1994. An atlas of Oregon Butterflies. Oregon State University

     Bookstore, Corvallis.



Hinchliff, J. 1994. The distribution of the butterflies of Oregon. Evergreen 

     Aurelians. Oregon State University Bookstore, Corvallis, 176 pp. + map. 



Opler, Paul A. 1999. Peterson Field Guide to Western Butterflies, revised 

     edition. Houghton Mifflin Co., Boston, Mass.



Stanford, R.E. and P.A. Opler. 1993. Atlas of Western USA Butterflies. 

     Privately published, Denver, Colo. 



Tilden, J.W. and A.C. Smith. 1986. A Field Guide to Western Butterflies. 

     Houghton Mifflin Co., Boston, Mass.

Western White (Pontia occidentalis)
distribution map
map legend

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