Members of a family typically share many morphological, chemical, or anatomical features that set them apart from other families. Many of the morphological features that, at least in part, define families are characteristics of their flowers or fruits, such as the arrangement of parts in a mustard flower (Brassicaceae), the pod of the bean family (Fabaceae), or the way in which the fruits of the parsley family (Apiaceae) come apart. These shared, derived features are often seen as evidence that members of a family share a single common ancestor, and so are monophyletic.
Davis & Heywood (1965), Radford et al. (1974), Reveal (1993), Zomlefer (1994)
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