ヒマワリが開花後、太陽を追わず東に向きっぱなしになる理由がようやく解明か？ミツバチと関連性
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太陽の動く方向を追うように花が回るることから、ひまわりは”日回り（日廻り）”とも表記されるが、実際に太陽の動きを追うのは生長が盛んな若い時期だけだ。完全に開花すると、基本的には東を向いたままほとんど動かなくなる。
これまでその理由は諸説あるものの定かではなかったが、『New Phytologist』（21年7月27日付）に掲載された研究によってついにその謎が解明されたようだ。
その理由はミツバチと密接な関係があったようだ。
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Source: カラパイア