What do phylogenetic trees illustrate ... between the species by invoking just four events of trait evolution. As this example illustrates, descendants of an ancestral lineage tend to share ...

A clade is a piece of a phylogeny ... oriented in different ways. The three trees in Figure 6, for example, have the same topology and thus the same evolutionary implications.

Many species in this clade are endangered and confined to unique habitats, such as sandhills and scrub. Other well-known examples of clades ... of millions of years of evolution.