Abstract: East China and Japan are very important parts in subregion Sino-Japanese. There are more similarities between them. Both of them contain the same families endemic to East Asia, such as Cercidiphyllaceae, Cephalotaxaceae, Eupteleaceae, Stachyuraceae etc. Both of them also share many genera of Sino Japanese distribution pattern, such as Cryptomeria, Disanthus,Berchemiella etc. Both of them contain about 830 species of Sino-Japanese distribution pattern, such as Peltoboykinia tellimoides, Kirengeshoma polmata, Platycrater ayguta, Chikusichloa aquatica, Neolitsea sericea, Theligonum japonicum etc. The vicarious species and paleobotany data also indicate the closer floristic relatonship between East China and Japan.

Key words: Subregion Sino-Japanese

摘要： 华东和日本两地为东亚地区重要组成部分，同属于中国-日本森林植物亚区。两地植物区系成分具有较高的相似性，两地共有连香树科（Cercidiphyllaceae）、三尖杉科（Cephalotaxceae）、领春木科（Eupteleaceae）、旌节花科（Stachyuraceae）等东亚特有科。华东和日本两地共有属约680多属。如柳杉（Cryptomeria）、双花木（Disanthus）、小勾儿茶（Berchemiella）等中国-日本分布属。还有为数众多的两地共有种，如涧边草（Peltoboykinia tellimoides（Maxim.）Hara）、黄山梅（Kirengeshoma palamata Yatabe）、蛛网萼（Platycrater arguta Sieb.et Zucc．）、山涧草（Chikusichloa aquatica Koidz）、舟山新木姜子（Neolitsea sericea（Bl.）Koidz.）和日本假繁缕（Theligonum japonicum Okubo et Makino．）等成分。这些共有成分表明了两区系间的密切联系。

关键词: 中国-日本植物亚区, 地理成分, 植物地理, 分布区, 替代种