perianth

Japanese: perianth

…Generally green, somewhat leaf-like in shape, and stronger than petals, their main function is to encase the entire flower during the bud stage and protect the interior. The sepals and petals together are collectively called the perianth, but when the perianth is differentiated into two layers and shows a significant morphological difference, the outer perianth is called the sepals and the inner perianth is called the petals. In hydrangeas, for example, the outer perianth develops and becomes petal-like, but in such cases it is still called the calyx. …

From [Flowers]

...A flower consists of a calyx (a collection of sepals), a corolla (a collection of petals), the stamens and pistils (which are directly involved in sexual reproduction), and the receptacle to which they are attached (Figure 1). The calyx and corolla are collectively called the perianth, and when there is no morphological difference between the two, such as in tulips, the calyx is called the outer perianth and the corolla is called the inner perianth. When young, the calyx closes tightly together to protect its inner part. ...

*Some of the terminology explanations that mention "perianth" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一般に緑色，形は多少葉に似ていて，花弁より強く，主な働きは，つぼみの時期に花全体を包み，内部を保護することである。萼片と花弁は合わせて花被perianthと総称されるが，花被が2層に分化し形態的に顕著な差を示すときに，外花被を萼片，内花被を花弁と呼ぶのである。アジサイなどでは，外花被が発達し花弁状となるが，このような場合も萼と呼んでいる。…

【花】より

…花は外側から萼片の集まった萼，花弁の集まった花冠，有性生殖に直接関係しているおしべとめしべ，さらにこれらがついている花托receptacleからなっている(図1)。萼と花冠は花被perianthと総称され，チューリップのように，両者の間に形態学的違いがない場合には，萼は外花被，花冠は内花被と呼ぶ。萼は若い時期にはしっかり閉じ合わさって，その内側の部分を保護している。…

※「perianth」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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