File talk:2019.jpg
[http://www.nga.gov/content/ngaweb/research/casva/research-projects.html A Project of the National Gallery of Art, Center for Advanced Study in the Visual Arts ]
Plate from Plantae et Papiliones Rariores (1748-59), Bibliothèque de l’Université de Strasbourg, France
http://www.plantillustrations.org/illustration.php?id_illustration=169444&mobile=0