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| image_caption = Sitka spruce in the [[Hoh Rainforest]] in [[Olympic National Park]] ...author=Farjon, A. |title=''Picea sitchensis'' |journal=[[The IUCN Red List of Threatened Species]] |volume=2013 |page=e.T42337A2973701 |publisher=[[IUCN]

...PLANTS Profile for ''Vitis'' (grape) |publisher=[[United States Department of Agriculture|USDA]] |accessdate=November 16, 2009}}</ref> ...Univ J Sci Technol |title=Grape (Vitis vinifera) seeds from Antiquity and the Middle Ages Excavated in Hungary - LM and SEM analysis |url=http://w3.mkk.s

...rs and families of flowering plants: APG III |journal=Botanical Journal of the Linnean Society |volume=161 |issue=2 |pages=105–121 |url=http://onlinelib See also [[Classification of the Cactaceae]]