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Trees account for more than a quarter of the species on the International Union for the Conservation of Nature's Red List. ... The loss of trees is a threat to thousands of plants, fungi and ...
Krummholz Pinus albicaulis in Wenatchee National Forest Wind-sculpted krummholz trees, Ona Beach, Oregon. Krummholz (German: krumm, "crooked, bent, twisted" and Holz, "wood") — also called knieholz ("knee timber") — is a type of stunted, deformed vegetation encountered in the subarctic and subalpine tree line landscapes, shaped by continual exposure to fierce, freezing winds.
The green to green-grey phyllodes are asymmetrical, with one leaf margin angled so the overall shape is triangular. They are 1–3 cm long by 0.6–1.5 cm wide. [6] There is a nectary at the widest part of the phyllode. [4] Flowering takes place from August to November, [4] and can be prolific on upper parts of the plant. [6]
Map of wood-filled areas in the United States, circa 2000 [1]. In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2]
Plants with more than one significant human use may be listed in multiple categories. Plants are considered domesticated when their life cycle , behavior , or appearance has been significantly altered as a result of being under artificial selection by humans for multiple generations (see the main article on domestication for more information).
The crown is very distinct, distinguished by level branches with vertically pendulous branchlets up to 1.2–2.4 m (4–8 ft), [6] each branch forming a 'curtain' of foliage. The pendulous foliage only develops when the tree grows to about 1.5–2 m tall; young trees smaller than this (up to about 10–20 years old) are open-crowned with sparse ...
The forest resources of the United States remained relatively constant through the 20th century. [3] The Forest Service reported total forestation as 766,000,000 acres (3,100,000 km 2) in 2012. [4] [5] [3] A 2017 study estimated 3 percent loss of forest between 1992 and 2001. [6]
It is one of the tallest tropical tree species: the tallest measured specimen is 85.8 m [6] or 88 m [2] (281 or 289 ft) tall. These grow mostly in lowland rainforests where they tower over the canopy. Like most tall rainforest trees they have huge buttress roots to support their weight. This is because the majority of the nutrients in ...