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".
HMS Laburnum (1915) was taken into tow by "Laburnum" and the sloop after the destroyer had taken off most of "Farnborough"s crew. "Farnborough" was beached at Mill Cove. On 25 February 1917 "Laburnum" was patrolling to the west of the Blasket Islands, off the west coast of Ireland, when she was ordered to meet up with and escort the liner which was Liverpool-bound from the United States. Uncertainty about "Laconia"s location delayed the rendezvous between the ships, with the result that "Laconia" was torpedoed by the German submarine before "Laburnum" could arrive on the scene. While "Laburnum" could not prevent "Laconia" sinking, she