Tsuga mertensiana

(Bongard) Carrière

Traité Gén. Conif., ed. 2 250. 1867

Common names: Mountain hemlock pruche de Patton
Basionyms: Pinus mertensiana Bongard Mém. Acad. Imp. Sci. St. Pétersbourg, Sér. 6., Sci. Math. 2: 163. 1832
Synonyms: Abies hookeriana A.Murray bis Abies pattoniana A.Murray bis Hesperopeuce mertensiana (Bongard) Rydberg Hesperopeuce pattoniana (A.Murray bis) Lemmon Picea (tsuga) hookeriana (A.Murray bis) Bertrand Pinus hookeriana (A.Murray bis) McNab Pinus pattoniana (A.Murray bis) Parlatore Tsuga crassifolia Flous Tsuga hookeriana (A.Murray bis) Carrière Tsuga pattoniana var. hookeriana (A.Murray bis) Lemmon Tsuga-picea hookeriana
Treatment appears in FNA Volume 2.
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


V2 23-distribution-map.gif

B.C., Alaska, Calif., Idaho, Mont., Nev., Oreg., Wash.


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


Lower Taxa


Facts about "Tsuga mertensiana"
AuthorRonald J. Taylor +
Authority(Bongard) Carrière +
BasionymsPinus mertensiana +
Common nameMountain hemlock + and pruche de Patton +
DistributionB.C. +, Alaska +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. + and Wash. +
Elevation0–2400m +
HabitatCoastal and montane forests to alpine slopes (where it occurs in krummholz form) +
Illustration copyrightFlora of North America Association +
IllustratorJohn Myers +
Publication titleTraité Gén. Conif., ed. 2 +
Publication year1867 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V2/V2 23.xml +
SynonymsAbies hookeriana +, Abies pattoniana +, Hesperopeuce mertensiana +, Hesperopeuce pattoniana +, Picea (tsuga) +, Pinus hookeriana +, Pinus pattoniana +, Tsuga crassifolia +, Tsuga hookeriana +, Tsuga pattoniana var. hookeriana + and Tsuga-picea hookeriana +
Taxon familyPinaceae +
Taxon nameTsuga mertensiana +
Taxon parentTsuga +
Taxon rankspecies +
VolumeVolume 2 +