Succulents and Cacti
Adapted to dry conditions many of the best come from the deserts and arid conditions of south Africa.
Massive group that seems to take on every plant form, not all are succulent, I have annual weeds of this genus growing next to my spuds.
These have bizarrely beautiful flowers for attracting carrion flies.
African again with some great examples of convergent evolution.
Variation on rosette formers.
All except one come from the Americas