Tsuga heterophylla

Tsuga heterophylla (Tsuga western, Western hemlock, fr. Pruche de l'ouest) - a species of conifers of the pine family. 4 Threats & Protection
5 Links
Distribution, Ecology & Country of Residence: Canada (Alberta, British Columbia); USA (Alaska, California, Idaho, Montana, Oregon, Washington). It grows from sea level to 600 m above sea level along the Pacific coast and reaches 1800 m in the Rocky Mountains. It grows on various soils with a pH of 3.5-5. The climate is cool sea along the coast, cold mountainous on the continent, with annual rainfall ranging from (500 -) 900-3,800 mm, decreasing inland. The dry summer limits the spread in the Rocky Mountains. The species is very sympatric with Picea sitchensis in most of the area. Extremely shade-resistant species, but has a shorter life span than Pseudotsuga menziesii or Picea sitchensis. Along the coast, it can sometimes form clean stands, but is more often an important component of marine mesothermal coniferous forests. On the Washington Peninsula, the tree reaches its maximum size, along with other giant conifers. Its shade tolerance allows it to grow under the canopy of other trees, but a thick mossy layer usually prevents light seeds from reaching the soil. Instead, the seeds sprout en masse on the fallen trees, from where several of them have the ability to send roots to the soil; as a result, T. heterophylla often forms rows at the site of the host tree.
Morphology
Trees up to 60 (75) m; trunk up to 200 cm in diameter at chest level; crown narrowly conical. The bark is gray-brown, scaly and moderately fractured. Buds ovate, gray-brown, 2.5-3.5 mm. Leaf size (5) 10-20 (30) mm, flattened; lower surface of gray with 2 broad stripes, top shiny green (yellow-green). Cones ovate, measuring (1) 1.5-2.5 (3) × 1-2.5 cm. The seeds are brown, 2-3 mm long, with thin 7-9 mm long light brown wings. 2n = 24
Cones - Trunks
Leafs - Usage
Is an Important Timber Tree in the Pacific Northwest of the USA and East. Canada. Unlike its eastern counterparts, the species is a fast-growing plant, even Douglas. Wood is used for piles, poles and railway sleepers and especially for construction. Most of the annual harvest goes to the timber industry for a variety of applications. This species has been introduced into forest plantations in the United Kingdom and other parts of northwestern Europe; in wetter areas near the Atlantic coast, it will spontaneously recover. As an extremely shade-coniferous tree suitable for growing deciduous forests; however, since it in turn obscures everything beneath it, it should not be done in (semi) natural forests where the native flora is valued. Although often planted as a specimen of trees in arboretum and parks, this species is not very used in gardening. This species is present in several protected areas, among which are known national parks.
Links
The Gymnosperm Database
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Species of the genus Tsuga
Tsuga canadensis · Tsuga caroliniana · Tsuga chinensis · Tsuga diversifolia · Tsuga dumosa · Tsuga forrestii · Tsuga heterophylla · Tsuga mertensiana · Tsuga sieboldii


Tsuga heterophylla

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