Cytisus praecox

About

Cytisus × praecox, the Warminster broom, is an artificial hybrid species of flowering plant in the family Fabaceae. Its parents are Cytisus multiflorus and Cytisus oromediterraneus. A deciduous shrub, it is available from commercial suppliers. It has a number of cultivars, including 'Allgold' and 'Warminster', which have both gained the Royal Horticultural Society's Award of Garden Merit. Other commercially available cultivars are 'Albus' and 'Lilac Lady'.

Summary from Wikipedia