… The genus Rhododendron, excluding Rhododendron nigra, is largely divided into the subgenera Rhododendron nigra and Rhododendron nigra. Rhododendron nigra is often treated as a member of the genus Rhododendron, but because of its long inflorescence, large persistent bracts, and large calyx lobes, it is more closely related to the genus Rhododendron and the North American genus Cladothamnus than to the genus Rhododendron, and it would be appropriate to classify it as the genus Therorhodion . In the subgenus Rhododendron, the leaves are rolled inward within the buds, and the branches and leaves are covered with scaly hairs. … *Some of the terminology that mentions "Cladothamnus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ツツジ属はエゾツツジを除いて,大きくヒカゲツツジ亜属とツツジ亜属に分けられる。エゾツツジはしばしばツツジ属の一員として扱われるが,花序が長く伸び,大きな永存性の苞葉があり,萼裂片が大きいことなど,ツツジ属よりホツツジ属や北アメリカのクラドタムヌス属Cladothamnusに類縁があると思われ,エゾツツジ属Therorhodionとするのが妥当と思われる。 ヒカゲツツジ亜属は芽の中で葉が内巻にたたまり,枝や葉は一面に鱗状毛でおおわれている。… ※「Cladothamnus」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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