The common name of pea is simpler than its botanical (scientific) name Pisum sativum why then is the simpler common name not used instead of the complex scientific/botanical name in biology ? 

Explanation

The common name .Pea. is a English word and this can have different names in different languages. It is easier to remember a standard scientific name as compared to so many names. Hence, instead of using simple common names, it is preferred to use scientific names which may appear complicated but universally accepted.