Laburnum in "L. anagyroides" and long in "L. alpinum". They have yellow pea-flowers in pendulous leafless racemes long in spring, which makes them very popular garden trees. In "L. anagyroides", the racemes are long, with densely packed flowers; in "L. alpinum" the racemes are long, but with the flowers sparsely along the raceme. The fruit develops as a pod and is extremely poisonous. The yellow flowers are responsible for the old poetic name 'golden chain tree' (also spelled golden chaintree or goldenchain tree). All parts of the plant are poisonous, although mortality is very rare. Symptoms of laburnum poisoning may include
Genus–differentia definition Genus–differentia definition A genus–differentia definition is a type of intensional definition, and it is composed of two parts: For example, consider these two definitions: Those definitions can be expressed as one genus and two "differentiae": The process of producing new definitions by "extending" existing definitions is commonly known as differentiation (and also as derivation). The reverse process, by which just part of an existing definition is used itself as a new definition, is called abstraction; the new definition is called "an abstraction" and it is said to have been "abstracted away from" the existing definition. For instance, consider the following: