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:''This article is about the tree. For other uses of the word, see [[Wingnut (disambiguation)]]'' {{Taxobox | color = lightgreen | name = Wingnut | image = Pterocarya-rhoifolia-Detail.jpg | image_width = 240px | image_caption = Japanese Wingnut (''Pterocarya rhoifolia'') | regnum = [[Plant]]ae | divisio = [[Flowering plant|Magnoliophyta]] | classis = [[Dicotyledon|Magnoliopsida]] | ordo = [[Fagales]] | familia = [[Juglandaceae]] | genus = '''''Pterocarya''''' | genus_authority = [[Thomas Nuttall|Nutt.]] ex [[Christian Horace Bénédict Alfred Moquin-Tandon|Moq.]] | subdivision_ranks = Species | subdivision = See text }} The '''wingnuts''' are [[plant]]s in the genus ''Pterocarya'' (from [[Ancient Greek]] ''pteron'', "wing" + ''kary'', "[[nut]]") in the walnut family [[Juglandaceae]], native to [[Asia]]. They are [[deciduous]] [[tree]]s, 10-40m tall, with [[pinnate]] leaves 20-45cm long, with 11-25 leaflets; the shoots have chambered [[pith]], a character shared with the [[walnut]]s (''Juglans'') but not the [[hickory|hickories]] (''Carya'') in the same family. The [[flower]]s are [[plant sexuality|monoecious]], in [[catkin]]s. The seed catkins when mature (about 6 months after pollination) are pendulous, 15-45 cm long, with 20-80 seeds strung along them. The [[seed]]s are a small [[nut (fruit)|nut]] 5-10 mm across, with two wings, one each side. In some of the species, the wings are short (5-10 mm) and broad (5-10 mm), in others longer (10-25 mm) and narrower (2-5 mm).

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