- Wingnut (plant)
name = Wingnut
image_width = 240px
image_caption = Japanese Wingnut ("Pterocarya rhoifolia")
divisio = Magnoliophyta
classis = Magnoliopsida
genus = "Pterocarya"
genus_authority = Nutt. ex Moq.
subdivision_ranks = Species
subdivision = See text
The wingnuts are
plants in the genus "Pterocarya" (from Ancient Greek"pteron", "wing" + "karyon", " nut") in the walnut family Juglandaceae, native to Asia.
deciduous trees, 10-40m tall, with pinnateleaves 20-45cm long, with 11-25 leaflets; the shoots have chambered pith, a character shared with the walnuts ("Juglans") but not the hickories ("Carya") in the same family.
flowers are monoecious, in catkins. The seed catkins when mature (about 6 months after pollination) are pendulous, 15-45 cm long, with 20-80 seeds strung along them.
seeds are a small 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).
There are six species of wingnut.
Pterocarya fraxinifolia" - Caucasian Wingnut. Caucasusand Elburzmountains in southwest Asia.
Pterocarya hupehensis" - Hubei Wingnut. Central China.
Pterocarya macroptera" - Large-winged Wingnut. West and southwest China.
Pterocarya rhoifolia" - Japanese Wingnut. Japan, eastern China( Shandong).
Pterocarya stenoptera" - Chinese Wingnut. China, widespread.
Pterocarya tonkinensis" - Tonkin Wingnut. Southernmost China( Yunnan), Indo-China.
Another species from China, the Wheel Wingnut with similar foliage but an unusual circular wing right round the nut (instead of two wings at the sides), previously listed as "Pterocarya paliurus", has now been transferred to a new genus, as "
Wingnuts are very attractive, large and fast-growing trees, occasionally planted in
parks and large gardens. The commonest in general cultivation outside of Asia is "P. fraxinifolia", but the most attractive is probably "P. rhoifolia". The hybrid "P. x rehderiana", a cross between "P. fraxinifolia" and "P. stenoptera", is even faster-growing and has occasionally been planted for timberproduction. The woodis of good quality, similar to walnut, though not quite so dense and strong.
* [http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=127445 Flora of China - "Pterocarya"]
* [http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=108834 Flora of China - "Cyclocarya"]
Wikimedia Foundation. 2010.