湖南八大公山的植物区系及其在植物地理学上的意义

湖南八大公山自然保护区是华中地区面积大且植物保存较完好的地点。土著种子植物计162科、709属、1775种。全部属按15个地理分布型进行分析，全部种按更细的分布型类别（中国特有分为10个亚型）进行分析。结果表明，本地热带分布的科属虽为数不少，但温带分布的科属更显优势，北温带科属比较集中，同时中国、东亚、及东亚一北美特有属也很集中。本山中国特有种计1120种，华中特有种为347种。植物区系的古老、残遗及特有性突出，可视为中国（华中）有典型代表性的山地。

THE VOLATILE CONSTITUENTS OF HEMEROCALLIS CITRINA

By using a suitable sample preparation, free and bound phytoestrogens (daidzein, equol, genistein, formononetin, coumestrol and biochanin A) can be isolated from extracts of fresh plant material and subsequently quantified by HPLC at different wave lengths. Chromatographic peaks assigned to phytoestrogens were identified by retention time and by comparison to the addi-tion of standards.