In Genesis 7:14, this signifies lusts and pleasures. (Arcana Coelestia 45[2])

The gourd which God prepared to come up over the head of the prophet Jonah, in Jonah 4:6, signifies the evil and self-love of the Jewish nation at that time. See Wild Gourds.

(Referencat: Apocalypse Explained 401; Jonah 4)