Large-leaved willow (Oobayanagi) - Oobayanagi (English spelling) Toisusu urbaniana (Seemen) Kimura

Japanese: オオバヤナギ(大葉柳) - オオバヤナギ（英語表記）Toisusu urbaniana (Seemen) Kimura

A deciduous tall tree of the Salicaceae family that grows on gravel along gentle rivers in the temperate zone of Hokkaido and north of central Honshu (illustration). It is one of the representative plants of Hokkaido's riverside forests. The scientific name, Toisusu , is taken from the Ainu name for the tree, with toy meaning grave and susu meaning willow. The trunk is upright and can reach a height of 20m. The bark is gray-brown and splits vertically. The leaves are oblong, 10-20cm long, with fine sawtooth edges and powdery white undersides. There are 5-8mm long stipules at the base of the petiole.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

本州中部以北，北海道の温帯域のゆるやかな川にそった砂礫地（されきち）に生えるヤナギ科の落葉高木（イラスト）。北海道の河岸林を代表する植物の一つ。学名のToisusuはアイヌの呼名からとったもので，toyは墓，susuはヤナギを意味するといわれる。幹は直立し，高さ20mに達する。樹皮は灰褐色で縦に裂ける。葉は長楕円形，長さ10～20cm，ふちには細鋸歯があり，裏面は粉白色。葉柄基部に長さ5～8mmの托葉がある。

出典　株式会社平凡社世界大百科事典第２版について　情報

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