or Walnut of Caucasus, Pterocarya fraxinifolia

tree of the family Juglandaceae (Walnut).

Etymology: from Greek pteron, "wing", and karion, "nut".
Origin: Caucasus, China, Japan; introduced by André Micheau, gardener of Louis XVI.
Height: 30 m tall. Its growth is quick.
Form (insulated tree): broad crown.
Bark: deeply cracked, black, similar to that of walnuts.

Deciduous, very big leaves (60 cm maximum), imparipinnate. Leaflets are finely toothed and slightly crinkled.

Flowers: long 30 cm garlands, of which come along on top small insignificant, greenish flowers, in June.

Fruits: winged nuts of 0,5 cm, greenish, hung on the peduncles of flowers, in September.
Uses: tree of street alignment, which has the disadvantage of pushing its roots on the surface so as to break down the sidewalks. It is avoided from now on.

Wingnut of China, Pterocarya stenoptera

Origin: China, introduced to France in XIXth century.
Flowers: in catkins, less long than in the Wingnut of Caucasus.
Fruits: winged, long garlands, appearing in September, like in the Wingnut of Caucasus, but somewhat smaller.


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