Pontia beckerii, the Becker's White, can be found in WA,OR,ID,WY,CA,NV,UT,AZ,NM,OK,MO, and KS.
Favorite netar plant: Isomeris arborea
USDA Growing Zones for this plant include: 8,9,10,11

Host plants:
Arabis lignifera
Brassica
Brassica nigra
Cleome isomeris
Descurainia incana viscosa
Descurainia sophia
Lepidium perfoliatum
Lepidium virginicum
Sisymbrium altissimum
Sisymbrium loeselii
Sisymbrium officinale
Stanleya
Stanleya elata
Stanleya pinnata
Thelypodium laciniatum streptantoides

CC0 image courtesy of
Alan Schmierer