Laburnum (also called Golden Chain) is a genus of two species of small trees in the subfamily Faboideae of the pea family Fabaceae, Laburnum anagyroides (Common Laburnum) and L. alpinum (Alpine Laburnum). They are native to the mountains of southern Europe from France to the Balkan Peninsula
They have yellow pea-flowers in pendulous racemes 10-30 cm (4-12 in) long in spring, which makes them very popular garden trees. In L. anagyroides the racemes are 10-20 cm (4-8 in) long, with densely packed flowers; in L. alpinum the racemes are 20-30 cm (8-12 in) long, but with the flowers sparsely along the raceme.
The leaves are trifoliate, somewhat like a clover, the leaflets typically 2-3 cm (¾-1¼ in) long in L. anagyroides and 4-5 cm (1½-2 in) long in L. alpinum.
Most garden specimens are of the hybrid between the two species, Laburnum × watereri (Voss's Laburnum), which combines the longer racemes of L. alpinum with the denser flowers of L. anagyroides; it also has the benefit of low seed production (Laburnum seed toxicity is a common cause of poisoning in young children, who mistake the seeds for peas).
The yellow flowers are responsible for the old poetic name 'golden chain tree' (also spelled golden chaintree or goldenchain tree).
They have yellow pea-flowers in pendulous racemes 10-30 cm (4-12 in) long in spring, which makes them very popular garden trees. In L. anagyroides the racemes are 10-20 cm (4-8 in) long, with densely packed flowers; in L. alpinum the racemes are 20-30 cm (8-12 in) long, but with the flowers sparsely along the raceme.
The leaves are trifoliate, somewhat like a clover, the leaflets typically 2-3 cm (¾-1¼ in) long in L. anagyroides and 4-5 cm (1½-2 in) long in L. alpinum.
Most garden specimens are of the hybrid between the two species, Laburnum × watereri (Voss's Laburnum), which combines the longer racemes of L. alpinum with the denser flowers of L. anagyroides; it also has the benefit of low seed production (Laburnum seed toxicity is a common cause of poisoning in young children, who mistake the seeds for peas).
The yellow flowers are responsible for the old poetic name 'golden chain tree' (also spelled golden chaintree or goldenchain tree).
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