+Laburnocytisus 'Adamii'

+Laburnocytisus 'Adamii' (Adam's laburnum or broom laburnum) is a small tree that is a graft-chimaera between two species, Laburnum anagyroides and Chamaecytisus purpureus, which has shoot similar of one of the species, some of the other, and some that are a mix of both "parents".

+Laburnocytisus 'Adamii' is a legume, a member of the Fabaceae family. The plus sign in its name (+), indicates its origin. This plant can also be described by the formula, Chamaecytisus purpureus + Laburnum anagyroides. It has also been written as a separate species, +Laburnocytisus adamii, but simultaneously, it is two species, not one. Only one cultivar, 'Adamii', has been created using this species.

Appearance
Most of the branches resemble their laburnum "parent's" in their foliage, with 3 leaflets at 3-6 cm long, though there are also dense clusters of broom-like shoots, but these are only 1 cm long, and are darker green. Its flowers appear in late spring to early summer. These will grow on branches with long (20-30 cm) racemes with yellow flowers, or in dense clusters of purple flowers. Most branches will also produce coppery-pink flowers on racemes 8-15 cm long, which are a mix between both "parents". In older specimens of this graft-chimaera, broom and mixed tissues begin to decline, while the laburnum tissues dominate. This tree will grow to a height of 7 m (sometimes, but rarely 8), and lives in the USDA plant hardiness zone 5 in Europe. It requires moderately fertile, moist, but well-drained soil, and should be grown in sun for it to flower well.

Origin
This graft-chimaera originated in the nursery at Mount Adam near Paris in 1825, probably as an accident; Chamaecytisus purpureus is normally a low-growing plant, and when grafted onto a straight trunk of a related species, it would expect to make an attractive standard.

Through theory, other +Laburnocytisus could have developed using different parents.

Structure
See graft-chimaera