Imagine you have a big map of the world with all the countries marked. Now imagine you want to know where different kinds of plants grow in each country. To make it easy, we use a scheme that divides the world into smaller regions called "botanical regions".
Each region has a number and a name, and we use this scheme to record where different kinds of plants grow. For example, if we find a particular type of cactus in Mexico, we would record it as growing in Botanical Region 82, which is called "Madrean pine-oak woodlands".
This way, we can easily compare which kinds of plants grow in different regions and learn more about the diversity of plant life across the world. It's like a big map that helps us keep track of all the different plants and where they live!