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Tsuga (, from Japanese 栂 (ツガ), the name of Tsuga sieboldii) is a genus of conifers in the subfamily Abietoideae. The common name hemlock (tree) is derived from a perceived similarity in the smell of its crushed foliage to that of the unrelated plant poison hemlock. Unlike the latter, Tsuga species are not poisonous.Eight to ten species are within the genus (depending on the authority), with four species occurring in North America and four to six in eastern Asia.

They are medium-sized to large evergreen ...