Some of the following links have been used to obtain information for the ICSL

General Informations

IPNI International Plant Name Index
cactus biblio cactus literature on the internet
cactuspro.com/biblio news

Cactus and Succulent Field Number Query

CITES Checklist third edition CITES 3 -->cactus biblio

plants of theworld online.org/

World Checklist of Selected Plant Families WCSP

The Cactician 4 a list of generic names

cactus-mall.com
cactiguide.com
Index Lodé
kakteenforum

Periodicals

cactusexplorers/journal
xerophilia.ro online cactus journal
echinocereus Journal Online

Special Plants

Escobaria escobaria.cz/club
haworthia-gasteria www.haworthia-gasteria.com
Thelocactus thelocactus.cactus-mall.com/

International Crassulaceae Network including downloads for The Cactician and Crassulacea

Gertel, A Life devoted to Sulcorebutia Vol.1

Single Studies

Phylogenetic relationships and evolution of growth form in Cactaceae