Chemical Properties

Nine species of evergreen, mostly hardy, coniferous trees, belong to the genus Tsuga. They are medium to large in size and usually pyramid-shaped Native to North America, Japan, Taiwan, China and the Himalayas, the species has horizontal branches, solitary monoecious fowers and globose to ovoid or oblong cones with thin, persistent scales The bark of T canadensis is a valuable source of tannin T heterophylla is the largest North American species, being 70 m (230 ft) or more in height.