  tsuga (,sunset western garden book, 1995:606â607 from  (), the name of tsuga sieboldii) is a genus of conifers in the pine family pinaceae. the common name hemlock 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.farjon, a. (2010). a handbook of the world's conifers 2: 533-1111. brill, leiden, boston. there are eight, nine, or ten species within the genus (depending on the authority), with four species occurring in north america and four to six in eastern asia.farjon, a. (1990). pinaceae. drawings and descriptions of the genera. koeltz scientific books isbn 3-87429-298-3.rushforth, k. (1987). conifers. helm isbn 0-7470-2801-x. ==description== left|thumb|tsuga diversifolia foliage and cones in snow they are medium-sized to large evergreen trees, ranging from  tall, with a conical to irregular crown, the latter occurring especially in some of the asian species. the leading shoots generally droop. the bark is scaly and commonly deeply furrowed, with the colour ranging from grey to brown. the branches stem horizontally from the trunk and are usually arranged in flattened sprays that bend downward towards their tips. short spur shoots, which are present in many gymnosperms, are weakly to moderately developed. the young twigs as well as the distal portions of stem are flexible and often p
Pinaceae Tsuga