Updated October 22, 2022
Peach-leaf Willow: Salix amygdaloides -
Arctic Willow: Salix arctica (Synonyms: Salix arctica ssp. tortulosa, Salix arctica var. araioclada, Salix arctica var. kophophylla, Salix arctica var. tortulosa) -
Barclay's Willow: Salix barclayi (Synonyms: Salix barclayi var. angustifolia, Salix barclayi var. conjuncta, Salix pyrolifolia var. hoyeriana) -
Bebb's Willow, Gray Willow, Long-beak Willow: Salix bebbina (Synonyms: Salix bebbiana var. bebbiana, Salix bebbiana var. capreifolia, Salix bebbiana var. depilis, Salix bebbiana var. luxurians, Salix bebbiana var. perrostrata, Salix bebbiana var. projecta) -
Booth's Willow: Salix boothii (Synonyms: Salix myrtillifolia, Salix pseudocordata, Salix pseudomyrsinites) -
Undergreen Willow, Under-green Willow, Variable Willow: Salix commutata (Synonyms: Salix barclayi var. commutata, Salix commutata var. commutata, Salix commutata var. denudata, Salix commutata var. puberula) -
Del Norte Willow: Salix delnortensis -
Eastwood's Willow, Mountain Willow, Sierra Willow, Sierran Willow: Salix eastwoodiae (Synonym: Salix californica) -
Columbia River Willow: Salix exigua var. columbiana (Synonym: Salix columbiana) -
Coyote Willow, Narrowleaf Willow: Salix exigua var. exigua (Synonyms: Salix argophylla, Salix exigua ssp. exigua, Salix exigua var. luteosericea, Salix exigua var. nevadensis, Salix exigua var. stenophylla, Salix exigua var. virens, Salix fluviatilis var. argophylla, Salix interior var. luteosericea, Salix longifolia var. argophylla, Salix longifolia var. exigua, Salix longifolia var. poaca, Salix luteosericea, Salix malacophylla, Salix nevadensis, Salix parishiana, Salix stenophylla) -
Narrowleaf Willow: Salix exigua var. hindsiana (Synonyms: Salix hindisana) -
Geyer's Willow: Salix geyeriana (Synonyms: Salix geyeriana ssp. argentea, Salix geyeriana var. argentea, Salix geyeriana var. geyeriana, Salix geyeriana var. meleina, Salix meleina) -
Glaucous Willow, , Gray-leaf Sierra Willow, Gray Willow: Salix glauca var. villosa (Synonyms: Salix glauca ssp. glabrescens, Salix glauca var. glabrescens, Salix orestera, Salix pseudolapponum, Salix villosa, Salix wolfii var. pseudolapponum) -
Coastal Willow, Dune Willow, Hooker's Willow: Salix hookeriana (Synonyms: Salix amplifolia, Salix hookeriana var. laurifolia, Salix hookeriana var. tomentosa, Salix piperi) -
Polished Willow: Salix laevigata -
Gland Willow, Greenleaf Willow, Shining Willow, Tail-leaf Willow, Whiplash Willow: Salix lasiandra var. caudata (Synonyms: Salix caudata, Salix caudata var. bryantiana, Salix caudata var. caudata, Salix lasiandra ssp. caudata, Salix lasiandra var. fendleriana, Salix caudata var. parvifolia, Salix lucida, Salix lucida ssp. caudata) -
Pacific Willow: Salix lasiandra var. lasiandra (Synonyms: Salix lasiandra var. abramsii, Salix lasiandra var. lancifolia, Salix lasiandra var. lyallii, Salix lasiandra var. macrophylla, Salix lasiandra var. recomponens, Salix lucida, Salix lucida ssp. lasiandra) -
Arroyo Willow: Salix lasiolepis (Synonyms: Salix lasiolepis var. bakeri, Salix lasiolepis var. bigelovii, Salix lasiolepis var. bracelinae, Salix lasiolepis var. falax, Salix lasiolepis var. lasiolepis, Salix lasiolepis var. sandbergii, Salix lutea var. nivaria) -
Strapleaf Willow: Salix ligulifolia (Synonyms: Salix eriocephala var. ligulifolia, Salix lutea var. ligulifolia) -
Corkscrew Willow: Salix matsudana - Introduced.
Dusky Willow: Salix melanopsis (Synonyms: Salix bolanderiana, Salix exigua ssp. melanopsis, Salix exigua var. gracilipes, Salix exigua var. tenerrima, Salix melanopsis var. bolanderiana, Salix melanopsis var. melanopsis, Salix melanopsis var. tenerrima, Salix parksiana, Salix sessilifolia var. vancouverensis, Salix tenerrima) -
Dwarf Snow Willow, Snow Willow: Salix nivalis (Synonyms: Salix nivalis var. nivalis, Salix nivalis var. saximontana, Salix reticulata, Salix reticulata ssp. nivalis, Salix reticulata var. nana, Salix reticulata var. nivalis, Salix reticulata var. saximontana) -
Bog Willow: Salix pedicellaris (Synonyms: Salix myrtilloides var. hypoglauca, Salix myrtilloides var. pedicellaris, Salix pedicellaris var. hypoglauca, Salix pedicellaris var. tenuescens) -
Alpine Willow, Rock-loving Willow: Salix petrophila (Synonyms: Salix anglorum, Salix anglorum var. araioclada, Salix arctica, Salix arctica ssp. petraea, Salix arctica var. caespitosa, Salix arctica var. graminifolia, Salix arctica var petraea, Salix arctica var. petrophila, Salix brownei, var. petraea, Salix caespitosa, Salix petrophila var. caespitosa) -
Diamondleaf Willow, Diamond-leaf Willow, Tea-leaf Willow, Tea-leaved Willow, Plane-leaf Willow: Salix planifolia (Synonyms: Salix pennata, Salix phylicifolia ssp. planifolia, Salix phylicifolia var. pennata, Salix phylicifolia var. planifolia, Salix planifolia var. pennata) -
MacKenzie's Willow: Salix prolixa (Synonyms: Salix cordata var. mackenzieana, Salix eriocephala ssp. mackenzieana, Salix eriocephala var. mackenzieana, Salix mackenzieana, Salix mackenzieana var. mackenzieana, Salix mackenzieana var. macrogemma, Salix rigida, Salix rigida ssp. mackenzieana, Salix rigida var. mackenzieana, Salix rigida var. macrogemma) -
Basket Willow, Purple Osier Willow, Purple Willow: Salix purpurea - Non-native, not naturalized.
Scouler's Willow: Salix scouleriana (Synonyms: Salix scouleriana var. brachystachys, Salix scouleriana var. coetaenea, Salix scouleriana var. crassijulis, Salix scouleriana var. flavescens, Salix scouleriana var. poikila, Salix scouleriana var. scouleriana, Salix scouleriana var. thompsonii, Salix stagnalis) -
Northwest Sandbar Willow, Sessile-leaf Willow: Salix sessilifolia (Synonyms: Salix exigua var. sessilifolia, Salix fluviatilis var. sessilifolia, Salix longifolia var. sessilifolia, Salix macrostachya, Salix macrostachya var. cusickii, Salix sessilifolia var. villosa) -
Sitka Willow: Salix sitchensis var. sitchensis (Synonym: Salix coulteri) -
Tracy's Willow: Salix tracyi -
Hybrid White Willow: Salix xfragilis (Synonym: Salix alba x Salix fragilis) - Non-native, naturalized.
Weeping Willow, Wisconsin Weeping Willow: Salix Xsepulcralis (Synonym: Salix Xpendulina) -