Family / Common Name

Scientific name

Larval Plants

Fern Ridge

Willow Creek

Flight
Period

Papilionidae (Swallowtails)

anise swallowtail

Papilio zelicaon

Apiaceae, Umbelliferae, Heracleum, Lomatium, Foeniculum (Anise)

X

X

M. Mar. -E. Sep.

western tiger swallowtail

Papilio rutulus

Salix, Populus, Acer, etc.

X

M.Apr.- E. Aug.

pale tiger swallowtail

Papilio eurymedon

Ceanothus, Rhamnus

E. May- E. Aug.

Clodius Parnassian

Parnassius clodius claudianus

Dicentra (bleeding heart)

E. May-
M. Sep.

Pieridae (Whites & 
Sulphurs)

Sara's orange tip

Anthocharis sara flora

Cardamine, Brassicaceae, 
Cruciferae-Arabis, Sisymbrium

X

M. Mar. -L. July

orange or alfalfa sulphur

Colias eurytheme

Fabaceae, legumes-Medicago, Trifolium, Lotus (birdsfoot trefoil)

X

X

E. May -M.Oct.

cabbage white *

Pieris rapae

Brassicaceae, Cruciferae

X

E. Mar. -E. Oct.

mustard white

Pieris napi marginalis

Cruciferae-Arabis, Dentaria, Cardamine, Viola glabella

L. Mar. -E. Sep.

Lycaenidae (Blues)

eastern tailed blue

Everes comyntas

Trifolium, Legumes

X

X

E. Apr. -L. July

western tailed blue

Everes amyntula

legumes-Lathyrus, Vicia

X

E. Apr.-
M. Aug.

Acmon blue

Plebejus acmon

Lotus, Eriogonum, Astragalus

X

X

L. Apr. -L. Sep.

silvery blue

Glaucopysche lygdamus columbia

legumes-Astragalus, Lotus, Lupinus

X

L. Mar.- M. Aug.

echo blue or spring azure

Celastrina argiolus echo

Shrubs-Ceanothus, Spirea, osier dogwood, Sambucus

M. Mar. -M. July

purplish copper

Lyceana helloides

Polygonun, Rumex, Potentilla

X

E. May -M.Sep.

grey or common  hairstreak

Strymon melinus setonia

legumes, mallows, Rosa spp.

X

L. Mar. -E. Sep.

cedar or olive hairstreak

Mitoura grynea plicataria

Thuja, Juniperus, Calocedrus

M. Apr. -E. Aug.

Nymphalidae (Fritillaries)

California sister

Adelpha bredowii californica

Quercus (not garryana), alnus

X

L. May -L. Oct.

Lorquin's admiral

Limenitis lorquini burrisoni

Salix, Populus, Spirea, Amelanchier

X

X

E. May- E. Oct..

mourning cloak

Nymphalis antiopa

Salix, Populus, Ulmus, Spirea, Alnus, Acer

X

L. Mar. -M. Oct.

field crescent

Phyciodes pratensis (syn. campestris)

Aster

X

X

M. May -E. Sep.

mylitta crescent

Phyciodes mylitta

Cirsium (thistle)

X

X

M.Mar.
-M.Oct.

great spangled fritillary

Speyeria cybele pugetensis

Viola glabella

L. June -E.Sep.

western meadow fritillary

Boloria epithore chermocki

Viola glabella

E. May -L. Aug.

chalcedon checkerspot

Euphydryas chalcedona colon

Penstemon, Symphoricarpus

E. May -M. Aug.

painted lady

Vanessa cardui

Cirsium, Urtica (nettle), Carduus thistles

X

X

M. Apr. -E. Nov.

west coast lady

Vanessa annabella

Malvaceae, Urtica

L. Apr. -L. Oct.

red admiral

Vanessa atalanta rubria

Urtica, Humulus

X

E. May -E. Oct.

satyr anglewing

Polygonia satyrus

Urtica, Salix

Mar.-Oct.

common buckeye

Junonia coenia

snapdragon, toadflax, plantains

L. May - L. Oct

Danaidae 
(milkweed butterflies)

monarch

Danaus plexippus

Asclepias (milkweed)

X

E. June -E. Oct.

Satyridae (Browns)

large wood nymph

Cercyonis pegala

grasses-Stipa, Poa, Avena

X

X

L. May -M.Sep.

common ringlet

Coenonympha tullia eunomia

grasses-Stipa, Poa

X

X

L. Mar.
-E. Oct.

Hesperidae (Skippers)

sachem or field skipper

Atalopedes campestris

grasses-Cynodon, Digiteria, Poa

X

X

M. May - L. Oct.

roadside skipper

Amblyscirtes vialis

grasses-Poa, Agrostis, AVena

X

L. Apr. -L. Aug.

dun skipper

Euphyes vestris

grasses-Poa, Tridens, Cyperus, sedges - carex

X

X

L. May -E. Sep.

woodland or western skipper

Ochlodes sylvanoides

grasses-Cynodon, Phalaris

X

X

M. June -L. Sep.

common checkered skipper

Pyrgus communis

Potentilla, Sidalcea, Malvaceae

X

L. Apr. -E. Sep.

Sonora skipper

Polites sonora

grasses-Poa, Festuca

X

L. May -L. Aug.

propertius dusky-wing

Erynnis propertius

Quercus garryana, Castanopsis

X

E. Apr. -M. July

Day-flying moths

Ranchman's tiger moth

Platyprepia virginalis

Plantago, Fabaceae

X

cinnibar moth *

Tyria jacobaea

Senecio jacobea (tansy ragwort)

X