Taxaceae
Taxus wallichiana
Throughout its range in the eastern Himalayas this species is threatened by exploitation for traditional and modern medicines as well as the conversion of its habitat for agriculture and harvesting for fodder and firewood.
Description
Taxonomic notes
Taxus wallichiana is usually considered to be a wide ranging species that occurs from Afghanistan eastwards through the Himalayas into southwestern China. Disjunct subpopulations in Vietnam, Indonesia and the Philippines are also sometimes identified as this species. Detailed morphological and molecular analyses of Himalayan and Chinese subpopulations over the last decade indicate that subpopulations in the western Himalayas represent a distinct species (T. contorta Griff.). In the eastern Himalayas two species are present: T. wallichiana and T. mairei. Subpopulations in southern Vietnam have been re-identified as T. mairei while those in the Philippines and Indonesia are the subject of ongoing research.
Human Uses
The wood of Himalayan Yew is durable and strong and is used for door frames, furniture, candlesticks and knife handles. In Bhutan, especially in the East, people use the wood for making milk and water containers. It is also used for gates and fences. The wood is also burnt as incense in Nepal and parts of Tibet. In other areas the wood is used as fuel. Foliage may be used as fodder. The alkaloid compounds (taxanes) of the bark and leaves are a source for the anti-cancer drug paclitaxel (Taxol®) which has become a major reason for exploitation in recent years. Traditional medicine has made use of young shoots and leaves and sometimes of inner bark for a long time in various potions, tinctures, and pastes. The fleshy aril around the seed is consumed by local inhabitants as jams. The inner bark also produces a red dye, often used in religious ceremonies by Brahmins of Nepal.
References and further reading
- Bhattari, N.K. and Karki, M.B. (2004). Conservation and management of Himalayan medicinal plants in Nepal. E.M. Donoghue, G.L. Benson, J.L. Chamberlain, tech. coords. 2004. Sustainable production of wood and non-wood forest products: Proceedings of IUFRO Division 5 Research Groups 5.11 and 5.12, Rotorua, New Zealand, March 11–15, 2003. General Technical Report PNW-GTR-604. Portland. Portland, Oregon: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. pp45-50.
- Dhungana, S.P. & Bhattarai, R.M. (2009). Exploring Economic and Market Dimensions of Forestry Sector in Nepal. Journal of Forest and Livelihood 7(1): 58-69.
- Dorji, Y. (2010). A Red Data List for the Flowering Plants of Bhutan. Critical Ecosystem Partnership Fund, WWF. Thimpu. 179pp.
- Gao, L.M., M. Moeller, X.-M. Zhang, M. Hollingsworth, J. Liu, R.R. Mill, M. Gibby & D.-Z. Li. (2007). High variation and strong phylogeographic pattern among cpDNA haplotypes in Taxus wallichiana (Taxaceae) in China and North Vietnam. Journal of Molecular Ecology (16): 4684-4698
- Moller, M.M., Gao, L.M., Mill, R.R., Li, D.Z., Hollingsworth, M.L. & Gibby, M. (2007). Morphometric analysis of the Taxus wallichiana-complex based on herbarium material. Botanical Journal of the Linnaean Society 155: 307-355.
- Mulliken, T.& Crofton, P. (2007). Review of the Status, Harvest, Trade and Management of Seven Asian CITES-listed Medicinal and Aromatic Plant Species. Results of the R+D Project FKZ 804 86 003
- Nguyen, T.H., Phan, K.L., Nguyen, D.T.L.,Thomas, P.I., Farjon, A., Averyanov, L. & Regalado Jr., J. (2004) Vietnam Conifers: Conservation Status Review 2004. Fauna & Flora International, Vietnam, Hanoi.
- Nimachow, G., Rawat, J.S. & Dai, O. (2010). Status of Himalayan yews in West Kameng district of Arunachal Pradesh. Current Science 98(11): 1434-1437.
- Poudel RC, Gao L-M, Moeller M, Baral SR, Uprety Y, Jie Liu & Li, DZ. (2013). Yews (Taxus) along the HinduKush-Himalayan region: Exploring the ethnopharmacological relevance among communities of Mongol and Caucasian origins Journal of Ethnopharmacology 147:190–203
- Poudel RC, Moeller M, Gao L-M, Ahrends A, Baral SR, Jie Liu, Thomas P & Li, DZ. (2012). Using Morphological, Molecular and Climatic Data to Delimitate Yews along the Hindu Kush-Himalaya and Adjacent Regions. PLoS ONE 7(10): e46873. doi:10.1371/journal.pone.0046873
- Royal Government of Bhutan (2006). Forest and nature conservation rules of Bhutan. Ministry of Agriculture, Department of Forests. Thimpu.
- Shah, A., Li, D.-Z., Moller, M., Gao, L.-M., Hollingsworth, M. a& Gibby, M. (2008). Delimitation of Taxus fuana Nan Li & R.R. Mill (Taxaceae) based on morphological and molecular data. Taxon 57(1): 211-222.
- Thomas, P. (2011). A review of the distribution and conservation status of Taxus in the Himalayas, China and Southeast Asia. Spanish Journal of Rural Studies 2(2 (special edition)): 35-42.
- Thomas, P. & Farjon, A. (2011). Taxus wallichiana. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. . Downloaded on 08 March (2013).
- Wang, S. & Xie, Y. (2004). China Species Red List. Vol. 1 Red List. Higher Education Press, Beijing, China.
- Xu, J., & Wilkes, A. (2004). Biodiversity impact analysis in northwest Yunnan, southwest China. Biodiversity and Conservation 13(5): 959-983.