License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Yamaguchi Soken 山口素絢. Soken Picture Album: The Plant Section (Soken gafu: Sōka no bu) 素絢画譜 草花之部, 1807. The Metropolitan Museum of Art.