Show Lower Taxa
Pseudotsuga menziesii
Bol. Soc. Brot. ser. 2, 24: 74. 1950.
Common names: Douglas-fir Oregon-pine sapin de Douglas
Basionym: Abies menziesii MirbelAbies taxifolia PoiretPinus taxifolia Lambert
Synonyms: Abies mucronata RafinesquePseudotsuga douglasii (Lindley) CarrièrePseudotsuga mucronata (Rafinesque) SudworthPseudotsuga taxifolia (Lambert) Britton
Treatment appears in FNA Volume 2.
Revision as of 19:09, 26 July 2019 by FNA>Volume Importer
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
North America, 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 |