Jinmenju

Jinmenju or Ninmenju is a type of Yōkai and Yaoguai in Japanese and Chinese folklore. It is commonly depicted as a tree bearing flowers that resemble human heads. It notably appears in the Edo period Konjaku Hyakki Shūi by Toriyama Sekien.

Concept
The Konjaku Hyakki Shūi depicts it as a tree blooming with flowers that resemble human heads, with the following explanatory text:

Besides Japanese yōkai, the Konjaku Hyakki Shūi also included publications of plants, animals and yōkai outside of Japan and this "jinmenju", as well as the Wakan Sansai Zue, quote from the Chinese Sancai Tuhui, which describes a similar tree from a land called "Daishikoku".

According to the Sancai Tuhui, Daishikoku is a land thousand ri southwest, with flowers like human hands, and upon asking it questions, its flowers would laugh, but it wouldn't understand human language and if they laugh too much, the flowers would wither and fall. The Rōō Sawa (老媼茶話), a collection of strange tales from Aizu, also quotes the Sancai Tuhui while making statements about this tree.

In popular culture
The Pokémon Exeggutor is based on the jinmenju.