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Taxus is a genus of coniferous trees or shrubs known as yews in the family Taxaceae. [1] Yews occur around the globe in temperate zones of the northern hemisphere, northernmost in Norway and southernmost in the South Celebes .
Taxus baccata is a species of evergreen tree in the family Taxaceae, native to Western Europe, Central Europe and Southern Europe, as well as Northwest Africa, northern Iran, and Southwest Asia. [4] It is the tree originally known as yew , though with other related trees becoming known, it may be referred to as common yew , [ 5 ] European yew ...
It is an evergreen tree or large shrub growing to 10–18 m tall, with a trunk up to 60 cm diameter. The leaves are lanceolate, flat, dark green, 1–3 cm long and 2–3 mm broad, arranged spirally on the stem, but with the leaf bases twisted to align the leaves in two flattish rows either side of the stem except on erect leading shoots where the spiral arrangement is more obvious.
[2] [3] The amount of taxine alkaloids depends on the species of yew, with Taxus baccata and Taxus cuspidata containing the most. [4] The major taxine alkaloids are taxine A and taxine B although there are at least 10 different alkaloids. [5] Until 1956, it was believed that all the taxine alkaloids were one single compound named taxine. [4]
Taxus brevifolia, the Pacific yew or western yew, is a species of tree in the yew family Taxaceae native to the Pacific Northwest of North America. It is a small evergreen conifer , thriving in moisture and otherwise tending to take the form of a shrub .
They are many-branched, small trees and shrubs.The leaves are evergreen, spirally arranged, often twisted at the base to appear 2-ranked.They are linear to lanceolate, and have pale green or white stomatal bands on the undersides.
Taxus pedunculata (Siebold & Zucc.) C.Lawson C.Lawson Cephalotaxus harringtonii , commonly known as Korean plum yew , [ 2 ] Japanese plum-yew , [ 3 ] Harrington's cephalotaxus , [ 4 ] or cowtail pine , is a species of coniferous shrub or small tree in the family Taxaceae .
Taxus floridana, the Florida yew, [3] is a species of yew, endemic to a small area of the Apalachicola River. This species is has restricted extent of occurrence (EOO) of 24km [ 4 ] along the Apalachicola River and resides in the mesophytic forests of northern Florida at altitudes of 15–40 m.