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Quercus subsericea [2] is a tree species in the beech family Fagaceae.There are no known subspecies. [3] [4] It is placed in subgenus Cerris, section Cyclobalanopsis.[5]This oak species is an emergent tropical forest tree, growing up to 52 m. tall and 0.86 m. dbh [6] and has been recorded from Malaysia, Indonesia, Philippines ().
Towards the centre of the trunk, the wood gets less hard. The wood has a Janka ball hardness of 112.5 - 154.7 kgf/cm 2 (1600 – 2200 psi), which is greater than that of oak (70.3 - 84.4 kgf/cm 2) and Douglas fir (35.9 kgf/cm 2). Coconut timber is classified according to three degrees of density: High-density timber (dermal) – hard: 600–900 ...
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Acorns from Quercus acutissima. Quercus acutissima is a medium-sized deciduous tree growing to 25–30 metres (82–98 feet) tall with a trunk up to 1.5 m (5 ft) in diameter.
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Ironwood is a common name for many woods that have a reputation for hardness, or specifically a wood density that is denser than water (approximately 1000 kg/m 3, or 62 pounds per cubic foot), although usage of the name ironwood in English may or may not indicate a tree that yields such heavy wood.
This use has been encouraged by the Philippines Department of Agrarian Reform and the Philippine Coconut Authority. [6] In the Philippine Cordilleras petroleum nut is locally known as apisang, abkel, abkol and da-il, is found among other trees like oak and other mossy forest species. It can also grow well with pine trees. [7]