Poplar and willow identification is often difficult, even with experience, mainly because many of those commonly cultivated are cultivars and clones, often of interspecific hybrids. They may even share the same parents and differ only slightly in appearance. Use our web app to identify cultivars.
The key is on the Manaaki Whenua website at https://keys.landcareresearch.co.nz/nzsalix, for public use. Updates will be made as new information such as name changes come in. The key now has 56 entities (species and hybrids) (see list below) and 2,300 images.
This is an older version, retained for interest. You should use either of the newer updated versions above.