…It includes about 60 orders, 300 families, 10,000 genera, and 160,000 species. Dicotyledons are often divided into the Apopetalae and Choripetalae (Archichlamydae) and the Sympetalae and Gamopetalae (Metachlamydae). This distinction is mainly based on whether the petals are separate or fused, but Sympetalae evolved from polypetalous flowers, and Sympetalae are a collection of flowers that evolved from various groups of polypetalous flowers and have sympetalous flowers, and are not a systematic group. … *Some of the terminology that mentions "Metachlamydae" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…約60目,300科,1万属,16万種が含まれる。 双子葉植物は離弁花類Apopetalae,Choripetalae(古生花被類Archichlamydae)と,合弁花類Sympetalae,Gamopetalae(後生花被類Metachlamydae)に分けられることが多い。この区別は主として花弁が離生するか合生するかによるが,合弁花は離弁花より進化しており,合弁花類は離弁花類のいろいろな群より進化して合弁花をもつに至ったものの寄集めで,系統的にまとまった群ではない。… ※「Metachlamydae」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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