Learn about carnivorous plants: https://botany.org/Carnivorous_Plants/
The world's strangest species of cactus: http://www.indefenseofplants.com/blog/2017/11/13/a-truly-bizarre-cactus-from-the-amazon
World Flora Online: http://www.worldfloraonline.org/
Tropicos: https://www.tropicos.org/