Which genus contains most trees commonly called pines? The answer is Pinus. In botanical usage, true pines are conifers in the genus Pinus, within the pine family, Pinaceae.
Pinus includes evergreen trees and shrubs whose needle-like leaves commonly grow in bundles called fascicles. Depending on the species, a bundle usually contains two to five needles. Pine cones produce seeds, and some species also provide edible pine nuts, timber, resin, pulp, or important habitat for wildlife.
The genus was named by Carl Linnaeus in 1753. Modern classifications divide it into two major subgenera: Pinus, containing the hard or yellow pines, and Strobus, containing the soft or white pines. Species counts vary by taxonomic authority, but Pinus is one of the largest conifer genera.
A common trap is that not every plant with “pine” in its common name is a true pine. Norfolk Island pine, for example, belongs to Araucaria, not Pinus. Cedars, firs, and spruces are also separate genera in the same broader family.