…The veins of gymnosperms are often bifurcated, as in the case of ginkgo, and the number of leaf scars is even, except in the case of a single leaf scar. However, some angiosperms, such as Kingdonia and Circaeaster , have bifurcated veins and an even number of leaf scars, and are considered primitive. (5) They produce flowers as a structure for sexual reproduction. … *Some of the terminology that mentions "Kingdonia" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…裸子植物の葉脈では,イチョウのように二叉(にさ)分岐することが多く,葉跡は1本の場合をのぞけば偶数である。しかし,被子植物でも,キングドニアKingdoniaやキルカエアステルCircaeasterのように,二叉分岐する葉脈と偶数の葉跡をもつものもあり,原始的とみなされる。(5)有性生殖のための構造として,花をつける。… ※「Kingdonia」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 |
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