Question
Are there cacti from Madagascar?

Answer
Rosetta,

Technically, no. Cacti are only native to the Americas. However, cacti have been naturalized throughout Africa so there may be cacti there. There are many plant from Madagascar that look like cacti (but are not), like Euphorbia, Alluaudia, Aloe, etc. Google those names with Madagascar and you'll be able to see what they look like.

Hope this helps.

Sincerely,

Greg