botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be...

In mathematics, Kruskal's tree theorem states that the set of finite trees over a well-quasi-ordered set of labels is itself well-quasi-ordered under homeomorphic...

edible fruit produced by an apple tree (Malus spp., among them the domestic or orchard apple; Malus domestica). Apple trees are cultivated worldwide and are...

tree can mean: Any of a number of tree species in the genera Gleditsia or Robinia, including: Honey locust (Gleditsia triacanthos), a leguminous tree...

Lemon Tree may refer to: Lemon (Citrus limon), a tree bearing fruit Lemon myrtle (Backhousia citriodora), an Australian native tree with a distinct lemon...

Look up dead tree or dead-tree in Wiktionary, the free dictionary. Dead tree may refer to: Dead Trees, an album by From First to Last Coarse woody debris...

following is a simplified family tree of the English, Scottish, and British monarchs. For more-detailed charts see: Family tree of English monarchs, from Alfred...

A Christmas tree is a decorated tree, usually an evergreen conifer, such as a spruce, pine or fir, or an artificial tree of similar appearance, associated...

A phylogenetic tree, phylogeny or evolutionary tree is a graphical representation which shows the evolutionary history between a set of species or taxa...

the family tree for monarchs of England (and Wales after 1282) from Alfred the Great to Elizabeth I of England. The House of Wessex family tree precedes...