Pseudotsuga menziesii

(Mirbel) Franco

Bol. Soc. Brot. ser. 2, 24: 74. 1950.

Common names: Douglas-fir Oregon-pine sapin de Douglas
Illustrated
Basionym: Abies menziesii Mirbel Mém. Mus. Hist. Nat. 13: 63, 70. 1825 Abies taxifolia Poiret 1805, Pinus taxifolia Lambert 1803,
Synonyms: Abies mucronata Rafinesque Pseudotsuga douglasii (Lindley) Carrière Pseudotsuga mucronata (Rafinesque) Sudworth Pseudotsuga taxifolia (Lambert) Britton
Treatment appears in FNA Volume 2.

Trees to 90 (–100) m; trunk to 4.4m diam.; crown narrow to broadly conic, flattened in age. Twigs slender, pubescent, becoming glabrous with age. Leaves 15–30 (–40) × 1–1.5mm, yellow-green to dark or bluish green, apex obtuse to acute. Pollen cones yellow-red. Seed-cones 4–10 × 3–3.5cm. Seeds 5–6mm, wing longer than seed body.

Distribution

Alta., B.C., Ariz., Calif., Colo., Idaho, Mont., N.Mex., Nev., Oreg., Tex., Utah, Wash., Wyo., Mexico

Discussion

Pseudotsuga menziesii is a most important timber tree, valued in both the Old and New worlds. The two intergrading varieties are sympatric in southern British Columbia and northeastern Washington.

Douglas-fir (Pseudotsuga menziesii) is the state tree of Oregon.

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Bracts straight, appressed; seed cones 6-10 cm; leaves yellowish green; Pacific Coast region. Pseudotsuga menziesii var. menziesii
1 Bracts spreading, often reflexed; seed cones 4-7 cm; leaves bluish green to dark green or gray-green; Rocky Mountain region. Pseudotsuga menziesii var. glauca

"relatively thin" is not a number.

... more about "Pseudotsuga menziesii"
obtuse +  and acute +
pendent +  and deflexed +
cylindric +, ovoid +  and ellipsoid +
Barney Lipscomb +
(Mirbel) Franco +
reddish-brown +
Abies menziesii +, Abies taxifolia +  and Pinus taxifolia +
not resinous +
conspicuous +
elongate +
Douglas-fir +, Oregon-pine +  and sapin de Douglas +
flattened +  and conic +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Nev. +, Oreg. +, Tex. +, Utah +, Wash. +, Wyo. +  and Mexico +
flush +  and raised +
short-stalked +
alternate +  and singly +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
yellow-green;dark or bluish green +
persisting +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
6 (?) +  and 8 (?) +
flattened +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not winged +  and 2-winged +
ovoid +  and ellipsoid or cylindric +
Bol. Soc. Brot. +
fibrous;woody +
arranged +  and overlapping +
persistent +
flattened +
grouped +  and solitary +
long-persistent +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
3 cm30 mm <br />0.03 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
reduced;well-defined short +
Illustrated +
Abies mucronata +, Pseudotsuga douglasii +, Pseudotsuga mucronata +  and Pseudotsuga taxifolia +
Pseudotsuga menziesii +
Pseudotsuga +
species +
decurrent +  and elongate +
glabrous +  and pubescent +
slender +
9,000 cm90,000 mm <br />90 m <br /> (10,000 cm100,000 mm <br />100 m <br />) +
reduced +