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Taxus cuspidata
Also called Rigid Branch Yew
Japanese yew is an evergreen conifer, usually a dense tree or large shrub, widely planted as an ornamental hedge or specimen. It tolerates shade and clipping, and is grown in cool temperate gardens.
Taxus cuspidata, the Japanese yew or spreading yew, is a conifer of the family Taxaceae, native to Japan, Korea, northeast China and the extreme southeast of Russia.
The entire yew bush, except the aril (the red flesh of the berry covering the seed), is toxic due to a group of chemicals called taxine alkaloids. Their cardiotoxicity is well known and act via calcium and sodium channel antagonism, causing an increase in cytoplasmic calcium currents of the myocardial cells. The seeds contains the highest concentrations of these alkaloids. If any leaves or seeds of the plant are ingested, urgent medical advice is recommended, as well as observation for at least 6 hours after the point of ingestion. The most cardiotoxic taxine is Taxine B followed by Taxine A; Taxine B also happens to be the most common alkaloid in the Taxus species.
Yew poisonings are relatively common in both domestic and wild animals who consume the plant accidentally. The taxine alkaloids are absorbed quickly from the intestine and in high enough quantities can cause death due to general cardiac failure, cardiac arrest, or respiratory failure. Taxines are also absorbed efficiently via the skin and Taxus species should thus be handled with care and preferably with gloves.
The tree is widely grown in eastern Asia and eastern North America as an ornamental plant.
Text excerpted from the Wikipedia article Taxus cuspidata by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
Pet safety from the ASPCA toxic and non-toxic plant lists.
