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Clethra arborea, commonly known as the lily-of-the-valley-tree, [2] is a flowering plant in the genus Clethra. It is found in Macaronesia where it is native to Madeira, extinct in the Canary Islands, [3] and considered an introduced species in the Azores. In Madeira its natural habitat is laurisilva forest.
Drunken trees, tilted trees, or a drunken forest, is a stand of trees rotated from their normal vertical alignment. [ 1 ] [ 2 ] This commonly occurs in northern subarctic taiga forests of black spruce ( Picea mariana ) under which discontinuous permafrost or ice wedges have melted, [ 3 ] [ 4 ] causing trees to tilt at various angles.
Other studies determined that seedfall in clearcuts beyond 80 m (260 ft) from seed trees was about 3% of seedfall in uncut stands where seed trees are close together. Well-stocked stands have resulted from seedfall from sources 1–2 km (0.62–1.24 mi) distant, but most Douglas-fir seeds fall within 100 m (330 ft) of their source.
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Due to their vertical structure, trees are more susceptible to cold than more ground-hugging forms of plants. [6] Summer warmth generally sets the limit to which tree growth can occur: while tree line conifers are very frost-hardy during most of the year, they become sensitive to just 1 or 2 degrees of frost in mid-summer.
Upon first seeing the tree in 1872, Hooker declared the tree to be the largest of its species in the known world. [2] Since then other valley oaks have been found of similar size. On January 7, 1958, the Sacramento Bee reported that in 1921 the Hooker Oak was over 110 ft (34 m) tall and estimated that 7,885 people could stand under its canopy ...
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