Also called the flower bed. In the flower of angiosperms, this is the part of the axis on which the flower leaves are attached, and continues to the pedicel. It is generally believed that the elongated state of the receptacle, as in the Magnoliaceae family, is primitive. As the flower evolves, the receptacle shortens and eventually becomes concave to encase the ovary. When this happens, like in apples, the receptacle will swell together with the ovary after flowering to form a false fruit. The disk is a part of the receptacle that swells to become a base for the stamens or pistils, or a ring-shaped protuberance that surrounds them. In the Sapindaceae family, the disk is located between the corolla and the stamens and surrounds the stamens, while in the Rutaceae family, it is located between the stamens and pistils and surrounds the pistil. Many disks secrete nectar. [Michio Tamura] [Reference] |©Shogakukan "> Names of the parts of angiosperm flowers Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
花床(かしょう)ともいう。被子植物の花において、花葉(かよう)がつく軸の部分のことで、小花柄(かへい)に続く。モクレン科のように花托の伸長した状態を原始的とする意見が一般的である。花の進化に伴って花托は短縮し、ついにはへこんで子房を包むようになる。そうなれば、リンゴのように花托も子房とともに花期後に肥大して偽果(ぎか)を形成する。 花托の一部分が膨らんで雄しべや雌しべの台のようになったり、それらを取り囲んで環状に隆起したものを花盤(かばん)という。ムクロジ科などでは花盤は花冠と雄しべの間にあって雄しべを囲み、ミカン科などでは雄しべと雌しべの間にあって雌しべを囲む。花盤は蜜(みつ)を分泌するものが多い。 [田村道夫] [参照項目] |©Shogakukan"> 被子植物の花の各部名称 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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