Clade

Clade [ Taxonomy ]	Dictionary of botanic terminology - index of names

A clade is a group of species related by descent with a common ancestor. Such a group is called a monophyletic group. The classification system based on clades is called cladistics.

In biological systematics, a clade is a monophyletic grouping of taxa where all members share a common ancestor (the founder) and all offspring of members of the group (that is, all descendants of the founder), e.g. the cactus all evolved from a single common ancestor and are a 'clade'. The members of a clade are closely related to each other and have one or more derived features shared by all the members (synapomorphies).

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