共生の森でウツギが咲いています。林縁などに生えるアジサイ科の落葉低木です。和名のウツギ（空木）は、成長した枝が中空（茎の内部が空洞なこと）であることに由来します。

"Utsugi" trees are in bloom in the "Kyosei-Forest (共生の森)." They are small deciduous trees in the Hydrangeaceae family that commonly grow along forest edges. The Japanese name "Utugi" comes from the fact that their mature branches are hollow inside.