+Laburnocytisus 'Adamii' (also known as Adam's laburnum or broom laburnum) is a horticultural curiosity; a small tree which is agraft-chimaera between two species, a laburnum, Laburnum anagyroides, and a broom, Chamaecytisus purpureus (syn. Cytisuspurpureus), which bears some shoots typical of the one species, some of the other, and some which are a peculiar mixture of both "parents".
+Laburnocytisus 'Adamii' is a legume, a member of the pea family Faboideae (or Papilionaceae, formerly Leguminosae). The plus sign (+) indicates its unusual origin. The plant can also be described by the formula Chamaecytisus purpureus + Laburnum anagyroides. (It has also been known as +Laburnocytisus adamii, as if it were one species, but strictly speaking it is not one species but two.) Only onecultivar, 'Adamii', is known to have arisen from this graft.