Grafting growth in the vascular cambium. Occasionally, a so-called "graft hybrid" or more accurately graft chimera can occur where the tissues of the stock continue to grow within the scion. Such a plant can produce flowers and foliage typical of both plants as well as shoots intermediate between the two. The best-known example this is probably +"Laburnocytisus" 'Adamii', a graft hybrid between "Laburnum" and "Cytisus", which originated in a nursery near Paris, France in 1825. This small tree bears yellow flowers typical of "Laburnum anagyroides", purple flowers typical of "Cytisus purpureus" and curious coppery-pink flowers that show characteristics of both "parents".
Laburnum the Pacific Northwest and Northern Europe. "Laburnum" trees are ubiquitous in England, Wales, Scotland and Ireland, where they are commonly planted as lawn specimens or in shrub borders. Most garden specimens are of the hybrid between the two species, "Laburnum" ×"watereri" 'Vossii' (Voss's laburnum), which combines the longer racemes of "L. alpinum" with the denser flowers of "L. anagyroides"; it also has the benefit of low seed production. It has gained the Royal Horticultural Society's Award of Garden Merit. Laburnum Laburnum, sometimes called golden chain or golden rain, is a genus of two species of small trees in the subfamily