Laburnum 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. Some botanists include a third species, Laburnum caramanicum, but this native of southeast Europe and Asia Minor is usually treated in a distinct genus Podocytisus, more closely allied to the brooms.
They have yellow pea-flowers in pendulous racemes 10-30 cm long in spring, which makes them very popular garden trees. In L. anagyroides the racemes are 10-20 cm long, with densely packed flowers; in L. alpinum the racemes are 20-30 cm long, but with the flowers sparsely along the raceme.
The leaves are trifoliate, somewhat like a clover, the leaflets typically 2-3 cm long in L. anagyroides and 4-5 cm long in L. alpinum.
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