+Laburnocytisus adamii at Roath Park Botanic Garden

+Laburnocytisus adamii 0

+Laburnocytisus adamii
early May 2019

Grid reference ST 18466 79140
Common name Adam's laburnum
Common name Broom laburnum
Origin Garden origin
Deciduous Yes
Status Rare
Height 4.5M
Girth 22.5cm
Reference 582

This fairly young tree is in the New Rest Garden.

Historically the 1905 Guide to Roath Park mentions the presence of Adam's laburnam in the Botanic Garden: "Laburnum Adami - several specimens of which are growing close to the iron railings by the path leading from the Bandstand to the Refreshment House - is one of the most extraordinary plants in the Park." These are long since gone.

+Laburnocytisus adamii bark

+Laburnocytisus adamii bark
early May 2019

+Laburnocytisus adamii leaf

+Laburnocytisus adamii leaves and flowers
early May 2019

+Laburnocytisus adamii flower1

+Laburnocytisus adamii flowers
early May 2019

General tree description

+Laburnocytisus adamii is a small tree, up to around 7 metres in height. It is a graft-hybrid between Laburnum (Laburnum anagyroides) and Purple broom (Cytisus purpureus). A horticultural curiosity, it has shoots typical of each parent and some which are intermediate between the parents. Most branches have foliage resembling laburnum - three leaflets 3 to 6 cm long - but there are also clusters of broom-like shoots, also with three leaflets, though 1 cm long and a darker green. Flowering is in late spring or early summer, consisting of long (20 to 30 cm) clusters of yellow laburnum flowers, as well as dense clusters of purple broom flowers, and some coppery-pink flowers which are midway between the two.

W.W. Pettigrew, Cardiff's first Parks Superintendent, writing in the 1905 Guide to Roath Park, gave the following description of Adam's laburnam: "It is not a natural species at all, but what is known as a "graft-hybrid". This tree is said to have originated with a French nurseryman, Jean Louis Adam, as a result of grafting Cytisus purpureus (one of the Brooms) on Laburnum Vulgare, (the Golden Chain). The peculiarity of L. Adami is that it invariably bears three distinct kinds of bloom - one a dull purplish flower borne on a long raceme, another is the typical flower of the common Golden Chain, whilst the third is the flower of the ordinary Cytisus purpureus, and quite distinct from the other two, both in colour and inflorescence."