Oplopanax

…A deciduous shrub of the Araliaceae family that grows in subalpine coniferous forests. The trunk is upright, almost unbranched, and less than 1m tall, and is densely covered with needle-like thorns. The leaves are clustered at the end of the trunk, alternate, circular or cordate, 20-40cm in diameter, irregularly cut into palmate edges, and the lobes have sharp notched duplicative serrations. The petioles and veins on both sides of the leaves have sharp needle-like thorns. The flowers are small, yellow-green, and numerous in June-July in panicles at the ends of the stems. The five petals are oblong and about 3mm long. …

*Some of the terminology explanations that mention "Oplopanax" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…亜高山の針葉樹林内に生えるウコギ科の落葉低木。幹は直立してほとんど分枝せず，高さ1m以下，全体，密に針状のとげに覆われる。葉は幹の先に集まって互生し，円形または心円形で径20～40cm，縁はふぞろいに掌状に切れ込み，裂片にはするどい欠刻様重鋸歯がある。葉柄や葉の両面脈上にはするどい針状のとげがある。花は小型で小さく，黄緑色，6～7月ごろ，茎の先端につく円錐花序に多数つく。花弁は5枚，長楕円形で長さ約3mm。…

※「Oplopanax」について言及している用語解説の一部を掲載しています。

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