What is the X in X-mas?
1570s, from Latin laburnum (Pliny), of unknown origin; perhaps from Etruscan.
any of several small trees of the genus Laburnum, of the pea family (Fabaceae), especially L. anagyroides. This species, which is native to southern Europe, is also cultivated in other regions as an ornamental. It grows to approximately 6 m (20 feet) tall and begins to branch at a point quite near the ground. The alternate leaves are compound, bearing three leaflets. The yellow flowers, measuring about 2 cm (0.75 inch) across, are borne in drooping clusters 10-30 cm (4-12 inches) long. The fruit of the golden chain is a pod about 5 cm (2 inches) long. The branches, leaves, and pods are somewhat hairy
any member of the genus (Laburnum) of trees and shrubs having butterfly-like flowers, and belonging to the subfamily Faboideae of the pea family (Fabaceae). The leaves are composed of three leaflets, and the flowers are disposed in hanging clusters (see ). The pods are slender and compressed. Laburnum anagyroides, often called golden chain, is native to southern Europe and is cultivated as an ornamental. The leaves have elongate stalks, and the bright yellow flowers hang in pendulous racemes up to a foot in length