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Yew is a common name given to various species of trees. It is most prominently given to any of various coniferous trees and shrubs in the genus Taxus : It is also used for any of various coniferous plants in the families Taxaceae and Cephalotaxaceae : Various coniferous plants in the family Podocarpaceae, superficially similar to other yews ...
In 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 narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height.
One of the oldest trees in Europe, estimated to be about 1,650 years old. Its crown spread covers an area of 1,017 square metres, its girth is 7.45 m, and its height is 23.4 m. Allerton Oak. Sessile oak ( Quercus petraea ) Calderstones Park, Liverpool, UK. 53°22′57″N 2°53′34″W / .
A listing of lists of trees . List of individual trees, including actual and mythical trees. List of largest giant sequoias. List of old growth forests. List of oldest trees. List of superlative trees. List of superlative trees in Sweden. List of tallest trees. List of tree genera.
In computer science, a tree is a widely used abstract data type that represents a hierarchical tree structure with a set of connected nodes. Each node in the tree can be connected to many children (depending on the type of tree), but must be connected to exactly one parent, [ 1] except for the root node, which has no parent (i.e., the root node ...
Tree of life (biology) The tree of life or universal tree of life is a metaphor, conceptual model, and research tool used to explore the evolution of life and describe the relationships between organisms, both living and extinct, as described in a famous passage in Charles Darwin 's On the Origin of Species (1859). [ 1]
The branches and leaves of a tree. Looking up into the branch structure of a Pinus sylvestris tree. Leafless tree branches during winter. A branch, also called a ramus in botany, is a stem that grows off from another stem, or when structures like veins in leaves are divided into smaller veins. [ 1]
v − 1. Chromatic number. 2 if v > 1. Table of graphs and parameters. In graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. [ 1] A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently ...