Useful Links
Cacti and succulent identification -- www.desert-tropicals.com
Cacti identification -- cactiguide.com
Cactus and succulent plant picture gallery (what is Mammillaria
huitzilopochtli?)-- www.cactus-art.biz/gallery/Photo_gallery_abc_cactus.htm
Common names of cacti -- https://cactiguide.com/name_search
Cacti & Succulent Blog from Australia -- https://blog.plantsacrossmelbourne.com.au/cacti-succulents-beginners/
Central Arizona CSS -- www.centralarizonacactus.org
Chihuahuan Desert Plants -- museum2.utep.edu/chih/gardens/list/species.htm
Cactus Museum -- www.cactusmuseum.com
Cactus Museum links to cactus-related websites -- www.cactusmuseum.com/links.asp
Lithops pictures, habitat, cultivation,... -- http://www.lithops.info/
Euphorbias -- https://www.euphorbia-international.org/news/news.htm
Info on cactus moth -- www.invasivespeciesinfo.gov/terrestrial/invertebrates/cactus-moth