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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.
They are quadrangular with a length of 8 to 12 centimetres (3.1 to 4.7 in), sometimes as long as 40 cm (16 in), with a width of about 1 millimetre (0.04 in). [3] It is a very slow growing species and can live up to 200 years. Saplings and juvenile trees have a conifer-like habit and can take 3 years to reach a height of 1 metre (3 ft). [6]
Acacia, commonly known as wattles [3] [4] or acacias, is a genus of about 1,084 species of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa, South America, and Australasia , but is now reserved for species mainly from Australia, with others from New ...
In total, over 300 species of plants grow in the valley. The forest in Qinngua Valley is a thicket consisting mainly of downy birch (Betula pubescens) and gray-leaf willow (Salix glauca), growing up to 7–8 metres (23–26 ft) tall. Growing sometimes to tree height is the Greenland mountain ash (Sorbus decora), which is usually a shrub. [1]
The flora of the alpine tundra is characterized by plants that grow close to the ground, including perennial grasses, sedges, forbs, cushion plants, mosses, and lichens. [28] The flora is adapted to the harsh conditions of the alpine environment, which include low temperatures, dryness, ultraviolet radiation, and a short growing season.
It can grow into a massive tree with many examples hundreds of years old. Around ten trees are known from the past and present with a diameter of 4 m (13 ft) or more with several specimens around 100 m 3 (3,500 cu ft) in total volume. [5] Like other plane trees, its leaves are borne alternately on the stem, deeply lobed, and palmate or maple ...
Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long. [116] Individual trees in the clonal patch have been listed as having ages of 2000 [117] [118] or even to 3000 years old. [119] [120]
This category is being considered for merging into Category:Trees of the United States. This nomination is part of a discussion of several related categories. This does not mean that any of the pages in the category will be deleted. They may, however, be recategorized.