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Description. Douglas-firs are medium-size to extremely large evergreen trees, 20–100 metres (70–330 feet) tall (although only Pseudotsuga menziesii var. menziesii, common name coast Douglas-firs, reach heights near 100 m) [10] and commonly reach 2.4 m (8 ft) in diameter, [11] although trees with diameters of almost 5 metres (16 feet) exist ...
Pseudotsuga / ˌsjuːdoʊˈtsuːɡə / [1] is a genus of evergreen coniferous trees in the family Pinaceae (subfamily Laricoideae). Common names for species in the genus include Douglas fir, Douglas-fir, Douglas tree, Oregon pine and Bigcone spruce. Pseudotsuga menziesii (Douglas fir proper) is widespread in western North America and is an ...
Doctoral advisor. David A. Perry. Suzanne Simard (born 1960) [3] is a Canadian scientist and Professor in the Department of Forest and Conservation Sciences at the University of British Columbia. [4] After growing up in the Monashee Mountains, British Columbia, [3][5][6] she received her PhD in Forest Sciences at Oregon State University. [4]
Coast Douglas-fir cone, from a tree grown from seed collected by David Douglas in 1826. David Douglas (25 June 1799 – 12 July 1834) was a Scottish botanist, best known as the namesake of the Douglas fir. He worked as a gardener, and explored the Scottish Highlands, North America, and Hawaii, where he died. [1]
The bottom (left) and top (right) of the foliage. Abies grandis is a large evergreen conifer growing to 40–70 metres (130–230 feet) tall, exceptionally 100 m (330 ft), with a trunk diameter of up to 2 m (61⁄2 ft). The dead tree tops sometimes fork into new growth. [4] The bark is 5 centimetres (2 inches) thick, reddish to gray (but purple ...
Doug Emhoff celebrates the Passover Seder. Recorded April 12, 2023. Douglas Craig Emhoff (born October 13, 1964) is an American lawyer who is the second gentleman of the United States. [1] He is married to Kamala Harris, the 49th vice president of the United States. As the first husband of a vice president, Emhoff is the first Second Gentleman ...
Pseudotsuga macrocarpa typically grows from 15–30 m (49–98 ft) in height and 56–155 cm (1 ft 10 in – 5 ft 1 in) in trunk diameter. [6] The growth form is straight, with a conical crown from 12–30 m (39–98 ft) broad, and a strong and spreading root system. The bark is deeply ridged, composed of thin, woodlike plates separating heavy ...
The structure and track were mostly built from 850,000 feet (259,080 m) of Douglas fir. In the past, the Douglas fir had been treated with pesticides which were not considered environmentally friendly and the track and supports were slowly being replaced with southern yellow pine. The track was made by bolting seven layers of wood.