The International Cactus + Succulent Lexicon (ICSL) is an online reference resource focused on cacti and other succulent plants. Founded in 2017 by Hans Frohning, it brings together plant information in a searchable lexicon and provides visitors with several ways to explore its content. The site includes an “All Plants” section and an advanced search, alongside introductory pages in multiple languages, including German, Austrian German, Czech, and Italian.

Additional resources include guidance on how to help with the lexicon, links, and literature, making the site useful both for browsing plant entries and for further research. ICSL also acknowledges that images remain the copyright of their original photographers. Its stated focus is the organization and sharing of cactus and succulent knowledge through an online reference, rather than the promotion of commercial products or services.

For enthusiasts and researchers, the lexicon offers a starting point for discovering plant names and related information, with supporting pages that invite contributions and point readers toward additional references