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FNA | Family List | FNA Vol. 2 | Pinaceae | Pseudotsuga

2. Pseudotsuga menziesii (Mirbel) Franco, Bol. Soc. Brot. ser. 2, 24: 74. 1950.

Douglas-fir, Oregon-pine, sapin de Douglas

Abies menziesii Mirbel, Mém. Mus. Hist. Nat. 13: 63, 70. 1825; A. mucronata Rafinesque; A. taxifolia Poiret 1805, not Desfontaines 1804; Pinus taxifolia Lambert 1803, not Salisbury 1796; Pseudotsuga douglasii (Lindley) Carrière; P. mucronata (Rafinesque) Sudworth; P. taxifolia (Lambert) Britton

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.

Varieties 2 (2 in the flora): North America, Mexico.

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.

1 Bracts straight, appressed; seed cones 6-10 cm; leaves yellowish green; Pacific Coast region.   2a var. menziesii
+ Bracts spreading, often reflexed; seed cones 4-7 cm; leaves bluish green to dark green or gray-green; Rocky Mountain region.   2b var. glauca

Lower Taxa


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