Diagram of a pitcher plant from the Encyclopædia Britannica Eleventh Edition . Originally uploaded to w:File:Pitcher plant diagram.png by w:User:Chowbok , 3 April 2006.

Pitcher of Nepenthes distillatoria . A: Honey-gland from attractive surface of lid. B: Digestive gland from interior of pitcher, in pocket-like depression of epidermis, opening downwards. C: Traverse section same.

This image comes from the 13 th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.