Alpine Willowherb, Pimpernel Willowherb: Epilobium anagallidifolium (Synonym: Epilobium alpinum var. alpinum) -
Autumn Willowherb, Tall Annual Willowherb: Epilobium brachycarpum (Synonyms: Epilobium paniculatum, Epilobium paniculatum var. hammondii, Epilobium paniculatum var. jucundum, Epilobium paniculatum var. paniculatum) -
Smooth Spikeprimrose:, Smooth WillowherbEpilobium campestre (Synonyms: Boisduvalia glabella, Epilobium pygmaeum) -
Hummingbird Trumpet, California Fuchsia: Epilobium canum ssp. canum (Synonym: Zauschneria californica ssp. californica or Zauschneria cana) - ?
California Fire Chalice,Californica Fushia, California Fuschsia, Hummingbird Trumpet, Mountain California Fuschia, Zauschneria: Epilobium canum ssp. latifolium (Synonyms: Epilobium canum var. latifolium, Zauschneria californica ssp. latifolia, Zauschneria latifolia, Zauschneria latifolia latifolia var. arizonica, Zauschneria latifolia var. latifolia) -
Fringed Willowherb, Purple-leaved Willowherb: Epilobium ciliatum ssp. ciliatum (Synonyms: Epilobium adenocaulon var. adenocaulon, Epilobium adenocaulon var. perplexans, Epilobium brevistylum, Epilobium brevistylum var. brevistylum, Epilobium brevistylum var. ursinum, Epilobium californicum, Epilobium ciliatum var. ciliatum, Epilobium glandulosum, Epilobium glandulosum var. macounii, Epilobium watsonii var. occidentale, Epilobium watsonii var. parishii) -
Ciliate Willowherb, Common Willowherb, Fringed Willowherb: Epilobium ciliatum ssp. glandulosum (Synonyms: Epilobium adenocaulon var. cinerascens, Epilobium adenocaulon var. occidentale, Epilobium ciliatum var. glandulosum, Epilobium glandulosum, Epilobium glandulosum var. glandulosum) -
Fringed Willowherb, Pacific Willowherb, Watson's Willow-herb: Epilobium ciliatum ssp. watsonii (Synonyms: Epilobium franciscanum, Epilobium watsonii, Epilobium watsonii var. watsonii) -
Club-fruited Willowherb, Talus Willowherb: Epilobium clavatum (Synonyms: Epilobium alpinum, Epilobium alpinum var. albiflorum, Epilobium alpinum var. clavatum)
Denseflower Spike Primrose, Dense-flower Willowherb: Epilobium densiflorum (Synonym: Boisduvalia densiflora, Boisduvalia densiflora ssp. pallescens, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. salicina, Boisduvalia densiflora var. salina, Oenothera densiflorum) -
California Willowherb, Suksdorf's Willowherb: Epilobium foliosum (Synonym: Epilobium minutum var. foliosum) -
Glaucous Willowherb: Epilobium glaberrimum ssp. fastigiatum (Synonym: Epilobium glaberrimum var. fastigiatum) -
Smooth Willowweed, Glaucous Willowherb: Epilobium glaberrimum ssp. glaberrimum (Synonym: Epilobium glaberrimum var. glaberrimum) -
Glandular Willowherb, Hall's Willowherb, Sierra Willowherb: Epilobium hallianum (Synonyms: Epilobium brevistylum, Epilobium brevistylum var. subfalcatum, Epilobium brevistylum var. tenue, Epilobium delicatum, Epilobium glandulosum, Epilobium glandulosum var. tenue, Epilobium pringleanum, Epilobium pringleanum var. tenue) -
Codlins-and-cream, Fiddlegrass, Fiddle Grass: Epilobium hirsutum -
Alpine Willowherb, Hornemann's Willowherb: Epilobium hornemannii ssp. hornemannii (Synonyms: Epilobium alpinum, Epilobium alpinum var. nutans, Epilobium hornemannii var. hornemannii) -
White-flower Willowherb, White-flowered Willowherb, Milk-flower Willowherb: Epilobium lactiflorum (Synonyms: Epilobium alpinum, Epilobium alpinum var. lactiflorum, Epilobium hornemannii var. lactiflorum) -
Low Willowherb, Slender-fruit Willowherb: Epilobium leptocarpum -
Yellow Willowherb: Epilobium luteum -
California Willowherb, Chaparral Willowherb, Small-flowered Willowherb, Small-flowered Willow-herb: Epilobium minutum (Synonyms: Epilobium foliosum, Epilobium minutum var. foliosum, Epilobium minutum var. minutum) -
Olympic Mountain Willowherb: Epilobium mirabile -
Broad-leaved Willow-herb: Epilobium montanum - Non-native.
Oregon Willowherb: Epilobium oreganum (Synonym: Epilobium exaltatum) -
Slimstem Willowweed: Epilobium oregonense (Synonyms: Epilobium alpinum, Epilobium alpinum var. gracillimum) -
Pale Boisduvalia: Epilobium pallidum (Synonym: Boisduvalia pallida) -
Marsh Willowherb, Swamp Willowherb: Epilobium palustre -
Smooth Spikeprimrose: Epilobium pygmaeum (Synonym: Boisduvalia glabella) -
Rigid Willowherb: Epilobium rigidum -
Siskiyou Willowherb: Epilobium siskiyouense -
Brook Willowherb, Stiff Spikeprimrose, Torrey's Epilobium, Torrey's Willowherb: Epilobium torreyi (Synonym: Boisduvalia stricta) -