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+Laburnocytisus adamii
+''Laburnocytisus adamii'' (also known as Adam's laburnum or broom laburnum) is a horticultural curiosity; a small tree which is a graft-chimaera between two species, a laburnum, ''Laburnum anagyroides'', and a broom, ''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". This binomial name is written as if it were one species, but strictly speaking it is not one species but two. The plus sign (+) indicates its unusual origin. The plant can also be described by the formula ''Laburnum anagyroides'' + ''Chamaecytisus purpureus''.
+''Laburnocytisus adamii'' is a legume, a member of the pea family Faboideae (or Papilionaceae, formerly Leguminosae). Only one cultivar, 'Adamii' (formally designated as +''Laburnocytisus'' 'Adamii'), is known to have arisen from this graft.
==Appearance==
Most of the tree's branches resemble the laburnum in their foliage, which has three leaflets (3-palmate) and 3–6 cm long, yet also with dense clusters of broom-like shoots, also with three leaflets, but only 1 cm long and a darker green. It flowers in late spring or early summer; some branches have long (20–30 cm) racemes of yellow laburnum flowers, while others produce dense clusters of purple broom flowers. Remarkably, most branches will also produce coppery-pink flowers on short (8–15 cm) racemes, which are midway between the two "parents"; the leaves on these shoots are also intermediate. In older specimens, the proportion of broom and mixed tissues tends to decline, and the laburnum to predominate. The tree grows to a height of 7 m (rarely 8 m) and is hardy to USDA plant hardiness zone 5 in northern Europe. It requires moderately fertile, moist but well-drained soil and should be grown in a sunny position to flower well.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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