Laburnocytisus 'Adamii' is a horticultural curiosity; a small tree which is a graft-chimaera between two species, a Laburnum anagyroides, and a Chamaecytisus purpureus (syn. Cytisus purpureus), which bears some shoots typical of the one species, some of the other, and some which are a peculiar mixture of both 'parents'. The plus sign (+) indicates the generic name is made for a graft-chimaera.