Species Page: Western White (Pontia occidentalis)

Western White

Pontia occidentalis (Reakirt, 1866)

Family: Pieridae

Status: Uncommon resident

NENHP Ranking: S2 Tier 2

Range: This species is a resident from much of Alaska east through Ontario, and south through Colorado, Utah, Nevada and northern California. In Nebraska it has been found in the panhandle and Dundy County.

Larval Hostplant(s): Various members of the Crucifer family are listed, of which the following occur in Nebraska: Mustards (Arabis drummondiA. glabraBrassica nigraChorispora tennillaSisymbrium altissimum), Flixweed (Descurainia sophia), and varities of Peppergrasses (Lepidium virginicum and Ldensiflorum).

Broods/Flight Times: Up to three broods from mid-May through August.

Overwintering: As pupae.

Habitat: The Western White is most often encountered on rocky or short grass prairie hillsides, although it has also been found in “urban” areas.

Avg. Wingspan: 1 1/2 – 2 1/8 inches

Found at: Gilbert-Baker SWMA

Similar Species: Spring and Checkered Whites