Taxus brevifolia
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| Image:PacificYew 7591.jpg Taxus brevifolia (Pacific Yew) foliage
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| Taxus brevifolia Nutt. |
Taxus brevifolia (Pacific Yew or Western Yew) is a conifer native to the Pacific Northwest of North America. It ranges from southernmost Alaska south to central California, mostly in the Pacific Coast Ranges, but with an isolated disjunct population in southeast British Columbia and south to central Idaho.
It is a small to medium-sized evergreen tree, growing 10-15 m tall and with a trunk up to 50 cm diameter, rarely more.
It has thin scaly brown bark. 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 flat rows either side of the stem except on erect leading shoots where the spiral arrangement is more obvious.
The seed cones are highly modified, each cone containing a single seed 4-7 mm long partly surrounded by a modified scale which develops into a soft, bright red berry-like structure called an aril, 8-15 mm long and wide and open at the end. The arils are mature 6-9 months after pollination, and with the seed contained are eaten by thrushes and other birds, which disperse the hard seeds undamaged in their droppings; maturation of the arils is spread over 2-3 months, increasing the chances of successful seed dispersal. The male cones are globose, 3-6 mm diameter, and shed their pollen in early spring. It is mostly dioecious, but occasional individuals can be variably monoecious, or change sex with time.
Uses
The chemotherapy drug paclitaxel, used in breast, ovarian and lung cancer treatment, is derived from Taxus brevifolia. Over-harvesting for production of this drug has resulted in the Pacific Yew becoming a rare species, despite the fact the drug can be produced semi-synthetically from cultivated yews. Pharmaceutical use of closely-related wild yew species in India and China threatens some of those species as well.[citation needed]
PacificYew 8538.jpg
Pacific Yew foliage |
PacificYew 7790.jpg
Pacific Yew mat form |
 Pacific Yew bark |
References
- Conifer Specialist Group (1998). Taxus brevifolia. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 05 May 2006.
- Heiken, D. (1992). The Pacific Yew and Taxol: Federal management of an emerging resource. Journal of Environmental Law and Litigation 7: 175.
- Flora of North America: Taxus brevifolia RangeMap:
- US Forest Service Silvics Manual: Taxus brevifolia
- US Forest Service: Taxus brevifolia (pdf file)
- UCLA text on "Economic Botany"de:Pazifische Eibe
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
