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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 ...
[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 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. Some populations exist in tropical highlands. [2] The oldest known fossil species are from the Early Cretaceous. [3]
The Llangernyw Yew (pronounced [ɬanˈɡɛrnɨu] ⓘ) is an ancient yew (Taxus baccata) in the village of Llangernyw, Conwy, Wales. The tree is fragmented and its core part has been lost, leaving several enormous offshoots. The girth of the tree at the ground level is 10.75 m (35.3 ft). [1]
Previous recognition of two distinct families, Taxaceae and Cephalotaxaceae (e.g., [12]), was based on relatively minor morphological details: Taxaceae (excluding Cephalotaxus) has smaller mature seeds growing to 5–8 millimetres (0.20–0.31 in) in 6–8 months, that are not fully enclosed by the aril; in contrast, Cephalotaxus seeds have a ...
The Ashbrittle Yew and sign, September 2020. The Ashbrittle Yew is an ancient yew tree (Taxus baccata) located in the village of Ashbrittle, Somerset, in southwest England.. The yew grows on a tumulus in the south-east end of the churchyard of St. John the Baptist
One trunk of the Fortingall Yew. The tree's once massive trunk (52 ft or 16 m in girth when it was first recorded in writing, in 1769 [5]) with a former head of unknown original height, is split into several separate stems, giving the impression of several smaller trees, with loss of the heartwood rings that would establish its true age. [6]
Taxus baccata leaves contain approximately 5 mg of taxines per 1g of leaves. [9] The estimated (i.e. not by any means a fact) lethal dose (LD min) of Taxus baccata leaves is 3.0-6.5 mg/kg body weight for humans [16] There is currently no known antidotes for yew poisoning, but drugs such as atropine have been used to treat the symptoms. [17]