The sum of plant species in a given geographical area is called flora of that area. The sum of animal species in a given geographical area is called fauna of that area. The term ‘vegetation’ has wider scope than the term ‘flora’. Vegetation is often used for much wider  eographical area than a particular ecosystem. In many cases, the term ‘vegetation’ is used for all the plants on the global scale.

Endemic Species: A species which is found only in a particular geographical area is called the endemic species for that area. For example; Rauvolfia serpentina is found only in India. So, it is an endemic species in India. 

Exotic Species: A species which is not naturally found in a particular area but may be living because of careful selection and breeding or because of being imported is called an exotic species. For example, Eichhornia crassipes is native of other country but it was introduced in India. So, it is an exotic species in India.