Now much the commonest laburnum grown in gardens, and probably the commonest in "wild" situations. In certain areas (e.g. about Slieve Gallion in Co Londonderry) it was planted as a hedging plant about 150 years ago so that long lengths of hedge are composed entirely of this tree. It is a fertile hybrid.
All names: Laburnum alpinum x anagyroides (L. x watereri) (Wettst.) Dippel; Laburnum x watereri (Wettst.) Dippel; Laburnum alpinum x anagyroides