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Giant sequoia. Silvics of North America (1991), [1] a forest inventory compiled and published by the United States Forest Service, includes many conifers. [a] It superseded Silvics of Forest Trees of the United States (1965), which was the first extensive American tree inventory. [3]
Encyclopedia of Conifers. A Comprehensive Guide to Conifer Cultivars and Species is an encyclopedia written by Aris G. Auders and Derek P. Spicer, published in 2012. The two-volume, extensively illustrated encyclopedia is a complete reference book covering all recognised conifer cultivars and species, both hardy and tropical.
Coast Douglas-fir is the second-tallest conifer in the world (after coast redwood), and the third-tallest of all trees, (after Eucalyptus regnans).Currently, coast Douglas-fir trees 60–75 metres (197–246 ft) or more in height and 1.5–2 metres (4.9–6.6 ft) in diameter are common in old growth stands, [4] and maximum heights of 100–120 metres (330–390 ft) and diameters up to 4.5–5. ...
The number of species has long been debated, but two in western North America and two to four in eastern Asia are commonly acknowledged. [ 2 ] [ 3 ] Nineteenth-century botanists had problems in classifying Douglas firs, due to the species' similarity to various other conifers better known at the time; they have at times been classified in Pinus ...
It is considered "the rarest conifer in North America." [80] The Center for Plant Conservation describes Florida torreya as "one of the rarest conifers in the world," reporting that in the mid-twentieth century it suffered a catastrophic decline, as all reproductive age trees died. Approximately 0.3% of the original population remains, mostly ...
The Douglas fir (Pseudotsuga menziesii) [4] is an evergreen conifer species in the pine family, Pinaceae.It is native to western North America and is also known as Douglas-fir, [5] Douglas spruce, [6] Oregon pine, [7] and Columbian pine. [8]
As of 2011, only 3 million acres (12,000 km 2) or so of the longleaf pine ecosystem are left in North America. This significant drop in the ecosystem acreage marks a 97 percent decrease. In overlook of the ecosystem, today, it is described as being patchy and uneven in the distribution across the landscape.
The American Conifer Society has established a select group of public gardens, designated as "reference gardens". To be considered for this program, a garden must follow the following standards: Contain conifer collections that will educate the public about growing conifers and demonstrate their uses in the landscape