Difference between revisions of "Tsuga mertensiana"
Traité Gén. Conif., ed. 2 250. 1867.
Common names: Mountain hemlock pruche de Patton
Basionym: Pinus mertensiana Bongard
Synonyms: Abies hookeriana A.Murray bisAbies pattoniana A.Murray bisHesperopeuce mertensiana (Bongard) RydbergHesperopeuce pattoniana (A.Murray bis) LemmonPicea (tsuga) hookeriana (A.Murray bis) BertrandPinus hookeriana (A.Murray bis) McNabPinus pattoniana (A.Murray bis) ParlatoreTsuga crassifolia FlousTsuga hookeriana (A.Murray bis) CarrièreTsuga pattoniana var. hookeriana (A.Murray bis) LemmonTsuga-picea hookeriana unknown
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trees </b>to 40m; trunk to 1.5m diam.; crown conic. <b>Bark</b> charcoal gray to reddish brown, scaly and deeply fissured. <b>Twigs</b> yellow-brown, glabrous to densely pubescent. <b>Buds</b> oblong, 3–4mm. <b>Leaves</b> 10–25(–30)mm, mostly spreading in all directions from twigs, curved toward twig apex, thickened centrally along midline, somewhat rounded or 4-angled in cross section, both surfaces glaucous, with ±inconspicuous stomatal bands; margins entire. <b>Seed</b> cones oblong-cylindric, 3–6 × 1.5–3cm; scales broadly fan-shaped, 8–15 × 8–15mm, apex rounded to pointed. <b>2n</b> =24.</span><!-- |
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|species=Tsuga mertensiana | |species=Tsuga mertensiana | ||
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Revision as of 13:14, 27 July 2019
Trees to 40m; trunk to 1.5m diam.; crown conic. Bark charcoal gray to reddish brown, scaly and deeply fissured. Twigs yellow-brown, glabrous to densely pubescent. Buds oblong, 3–4mm. Leaves 10–25(–30)mm, mostly spreading in all directions from twigs, curved toward twig apex, thickened centrally along midline, somewhat rounded or 4-angled in cross section, both surfaces glaucous, with ±inconspicuous stomatal bands; margins entire. Seed cones oblong-cylindric, 3–6 × 1.5–3cm; scales broadly fan-shaped, 8–15 × 8–15mm, apex rounded to pointed. 2n =24.
Habitat: Coastal and montane forests to alpine slopes (where it occurs in krummholz form)
Elevation: 0–2400m
Distribution
B.C., Alaska, Calif., Idaho, Mont., Nev., Oreg., Wash.
Discussion
The wood of Tsuga mertensiana is somewhat inferior to that of western hemlock both for building purposes and as pulp. This is a very handsome tree with its branches densely clothed with pale, spreading leaves and is adaptable to a wide variety of climatic conditions.
M.Van Campo-Duplan and H.Gaussen (1948) postulated that this taxon originated by hybridization between Picea and Tsuga. Although this is unlikely, some characteristics such as leaf arrangement and shape, phenolic chemistry, and pollen grain structure lend some support for this hypothesis.
Selected References
None.
Lower Taxa
None.