Decorative botanical illustrations used on this website are in the public domain. Full source and license details are listed below. Scientific figures and data visualizations are credited in their originating publications.

Illustration	Work / collection	Date	Source	License
The Cactaceae, Plate VIII	N. L. Britton & J. N. Rose, The Cactaceae; illustration by Mary Emily Eaton (Carnegie Institution of Washington)	1919–1923	Wikimedia Commons / Biodiversity Heritage Library	Public domain (published in the U.S. before 1929)
The Cactaceae, Plate XVI	N. L. Britton & J. N. Rose, The Cactaceae (Carnegie Institution of Washington)	1919–1923	Wikimedia Commons / Biodiversity Heritage Library	Public domain (published in the U.S. before 1929)
Addisonia, Plate 019	Addisonia (New York Botanical Garden); illustration by Mary Emily Eaton	1916	Wikimedia Commons / Biodiversity Heritage Library	Public domain (published in the U.S. before 1929)