"Crack willow" redirects here. For Eastern crack willow, see 
Salix euxina.
| Salix × fragilis | 
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| Leaves | 
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| Scientific classification | 
| Kingdom: | Plantae | 
 
| Clade: | Tracheophytes | 
 
| Clade: | Angiosperms | 
 
| Clade: | Eudicots | 
 
| Clade: | Rosids | 
 
| Order: | Malpighiales | 
 
| Family: | Salicaceae | 
 
| Genus: | Salix | 
| Species: | S. × fragilis | 
| Binomial name | 
| Salix × fragilis 
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| Synonyms | 
| Oisodix × decipiens Raf.
  Psatherips × fragilis (L.) Raf.
  Salix alba var. elyensis Burtt Davy
  Salix × chlorocarpa Schur
  Salix × decipiens Hoffm.
  Salix × excelsa Tausch ex W.D.J.Koch
  Salix × excelsior Host
  Salix × fragilior Host
  Salix × fragilissima Host
  Salix × fragillima Schur
  Salix × gracilenta Tausch
  Salix × lyonii J.Forbes
  Salix × monspeliensis J.Forbes
  Salix × montana J.Forbes
  Salix × neotricha Goerz
  Salix × palustris Host
  Salix × pendula Ser.
  Salix × persicifolia Schleich.
  Salix × rubens Schrank
  Salix × russelliana Sm.
  Salix × sanguinea Tausch ex Opiz
  Salix × viridis Fr.
  Salix × wargiana Lej.
  Vimen × russeliana (Sm.) Raf.
  
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Salix × fragilis, with the common names crack willow and brittle willow, is a hybrid species of willow native to Europe and Western Asia. It is native to riparian habitats, usually found growing beside rivers and streams, and in marshes and water meadow channels. It is a hybrid between Salix euxina and Salix alba, and is very variable, with forms linking both parents.