Host Plants
confirmed
LikelyQuaking Aspen
Populus tremuloides
Balsam Fir
Abies concolor
Grand Fir
Abies grandis
Balsam Fir
Abies magnifica
California Red Fir
Abies magnifica var. magnifica
Shasta Red Fir
Abies magnifica var. shastensis
Gray Alder
Alnus incana
Mountain Alder
Alnus incana ssp. tenuifolia
White Alder
Alnus rhombifolia
Red Alder
Alnus rubra
Water Birch
Betula occidentalis
Arching Ceanothus
Ceanothus arcuatus
Mountain Whitethorn
Ceanothus cordulatus
Buckbrush
Ceanothus cuneatus
Buckbrush
Ceanothus cuneatus var. cuneatus
Buckbrush
Ceanothus cuneatus var. ramulosus
Sandscrub Ceanothus
Ceanothus dentatus
Calistoga Ceanothus
Ceanothus divergens
Pine Mat
Ceanothus diversifolius
Wavy Leaved Ceanothus
Ceanothus foliosus
Wavy Leaved Ceanothus
Ceanothus foliosus var. foliosus
Fresno Ceanothus
Ceanothus fresnensis
Point Reyes Ceanothus
Ceanothus gloriosus
Glory Brush
Ceanothus gloriosus var. exaltatus
Point Reyes Ceanothus
Ceanothus gloriosus var. gloriosus
Mt. Vision Ceanothus
Ceanothus gloriosus var. porrectus
Desert Ceanothus
Ceanothus greggii
Coast Whitethorn
Ceanothus incanus
Deerbrush
Ceanothus integerrimus
Jepson Ceanothus
Ceanothus jepsonii
Chaparral Whitethorn
Ceanothus leucodermis
Mason's Ceanothus
Ceanothus masonii
Hairy Ceanothus
Ceanothus oliganthus
Jim Brush
Ceanothus oliganthus var. sorediatus
Wartleaf Ceanothus
Ceanothus papillosus
Little Leaf Ceanothus
Ceanothus parvifolius
Pinemat
Ceanothus prostratus
Blueblossom Ceanothus
Ceanothus thyrsiflorus
Carmel Ceanothus
Ceanothus thyrsiflorus var. griseus
Creeping Blueblossom
Ceanothus thyrsiflorus var. thyrsiflorus
Tobacco Brush
Ceanothus velutinus
Mojave Ceanothus
Ceanothus vestitus
Fremont Cottonwood
Populus fremontii
Fremont Cottonwood
Populus fremontii ssp. fremontii
Black Cottonwood
Populus trichocarpa
Booth's Willow
Salix boothii
Shortfruit Willow
Salix brachycarpa
Short-fruited Willow
Salix brachycarpa var. brachycarpa
Drummond's Willow
Salix drummondiana
Mountain Willow
Salix eastwoodiae
Sandbar Willow
Salix exigua
Narrow-leaved Willow
Salix exigua var. exigua
Sandbar Willow
Salix exigua var. hindsiana
Geyer's Willow
Salix geyeriana
Coastal Willow
Salix hookeriana
Jepson's Willow
Salix jepsonii
Red Willow
Salix laevigata
Shining Willow
Salix lasiandra
Tail-leaf Willow
Salix lasiandra var. caudata
Yellow Willow
Salix lasiandra var. lasiandra