…Among Japan's seed plants, there are over 1,600 endemic species, including the Japanese prunus tschonoskii, katsura, snowbell, and the familiar Kanto and Kansai dandelions, spread from Hokkaido to Kyushu. When considering the time of their distribution, endemic species can be divided into relict endemic (old endemic) and new endemic. Although the two are not always clearly distinguishable, relict endemic species are thought to have arisen in relatively ancient times and became endemic as a result of the shrinking of their distribution area, with no closely related plant groups in the surrounding areas and a high degree of isolation in terms of characteristics. … *Some of the terminology explanations that refer to "relic unique" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…日本の種子植物のうち固有種はフサザクラ,カツラ,イワユキノシタや見慣れたカントウタンポポやカンサイタンポポなど,北海道から九州にかけて1600余種を数えることができる。 固有種は,分布の成立時期を考慮した場合,遺存固有(古固有)および新固有に分けることができる。両者は必ずしも明確に区別できるものではないが,遺存固有は比較的古い時代に生じたとみられ,分布圏の縮小の結果固有となったものであり,周辺地域に近縁植物群が存在せず,形質の上でも孤立の度が高い。… ※「遺存固有」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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