Cactaceae of the boundary (Plate 33) BHL8100648.jpg
The botanical works of the late George Engelmann, collected for Henry Shaw, esq (1887) (20376087556).jpg
The IUCN Red List of Threatened Species 2022.2
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
Open Tree of Life reference taxonomy version 3.2
A dataset on catalogue of alien plants in China