Pterocarya


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Related to Pterocarya: Pterocarya fraxinifolia

Pterocarya

 

a genus of deciduous plants of the family Juglandaceae. The leaves are alternate and usually odd-pinnate; the flowers are unisexual and in catkins. The fruit is a drupe. There are ten species, distributed in Asia. One species, Pterocarya pterocarpa, is found in the USSR; it measures up to 35 m tall and up to 1.3 m in diameter. The species grows in forests of Transcauca-sian valleys together with alder, white beech, and several other types of trees. A moisture-loving and rapidly growing tree, it may live 200 years. The wood is white, light, friable, and not very sturdy. It is cultivated as an ornamental.

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Comparative results from LVL specimens made from Pterocarya fraxinifolia wood and plywood and LVLs from different species are given in Table 2.
MOR and MOE values of Pterocarya fraxinifolia LVLs are higher than those of Populus euramericana, Populus tremula, Populus nigra, and similar to those of Alnus glutinosa.
Tangential and radial diameters of the vessels of Pterocarya fraxinifolia (Lam.
In Juglans and Carya, the husk is thought to have evolved from bract and bracteoles of the inflorescence (Manning, 1940), the same structures that form the wings of Platycarya and Pterocarya.
These forests are more species-rich (including Tertiary relics such as Parrotia, Zelkova, Pterocarya, Celtis, Gleditsia, Diospyros, Liquidarnbar, Liriodendron, and Nyssa genera, as well as more species per genera) than the European alluvial hardwoods for two main reasons: the presence of refuge sites during the Quaternary glaciations, which did not occur in Europe, and the present-day warmer climate (with annual temperatures of 14 [degrees] C and mean annual rainfall of 1000 mm in the Mississippi valley, e.