A species of willow, Salix polaris

A species of willow tree whose bark is especially rich in salicin and tannin.

plural of Bedford willow

white willow

plural of Huntingdon willow

plural of willow tree

The willow warbler (Phylloscopus trochilus).

plural of willow wren

A polyp with slender branches like the osier, Pterogorgia anceps or other soft corals in the family Gorgoniidae.

plural of sea-willow