An equivalent characterization of a tree is that the root node has no predecessors and every other node has exactly one predecessor (Even 1979). Typical examples of trees that ... the root at the left ...

Take a look at this beautiful interactive tree of life diagram created by Evogeneao ... they’ve even thrown in a Cousin Calculator for good measure. For example, there are a few dragonflies ...

Lessons on language families are often illustrated with a simple tree diagram that has all the information but lacks imagination. There’s no reason linguistics has to be so visually uninspiring.