Pseudotsuga menziesii
Common name
Douglas fir, Oregon pine
Family
Pinaceae
Flora category
Vascular – Exotic
Structural class
Trees & Shrubs - Gymnosperms
NVS code
The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.
PSEMEN
Habitat
Terrestrial. A plant of lowland, montane and subalpine habitats growing in sites with low-moderate fertility (Timmins & MacKenzie 1995). A plant of scrub and forest margin communities, shrublands, tussockland and light wells in forest (Timmins & MacKenzie 1995).
Features
Very large resinous evergreen tree. Bark thick, reddish-brown beneath, rough and furrowed when mature. Branches in irregular whorls, horizontal; branchlets usually drooping. Shoots light to dark brown, ridged, with short hairs. Winter buds to 1 cm long, shining purplish-brown, narrow and sharp. Leaves 15-38 x 1-2 mm, in 2 ranks, needle-like, whitish beneath, edges often rolled, orange-scented when crushed. Male cones 12-20 mm long, catkin-like. Female cones 5-10 cm long, cylindric, papery, downward-pointing; seed scales large and broad; bract scales longer and thinner than seed scales, 3-pointed, centre point longest.
Similar taxa
Pseudotsuga can be separated from Tsuga as it lacks the persistent leaf base. Pseudotsuga macrocarpa is known to be cultivated in New Zealand and has cones 10 - 18 cm long. P. sinensis & P. japonica is also cultivated in specialist collections; both are from Asia .
Flower colours
No flowers
Propagation technique
Seed
Year naturalised
1925
Origin
N. America
Reason For Introduction
Forestry.
Life Cycle Comments
Perennial. Seedlings require the presence of a mycorrhizal fungi with seedlings establishing most readily on well lit sheltered sites where there is no competition from other vegetation. The plant seldom spreads onto land where vegetation cover is dense. Seed is produced at a rate of 20 000 seeds per mature tree annually (Timmins & MacKenzie 1995).
Seed is dispersed in autumn and winter by wind and gravity and remains viable for a few weeks to many years.
Tolerances
The plant is tolerant to shade, more so than other conifers and intolerant of drought. The plant is frost tolerant when it is higher than 2m. Physical damage results in regrowth if green foliage remains intact, recovers from browsing (Timmins & MacKenzie 1995). The plant recovers after fire if there is an adjacent seed source.