For my first thesis, I spend hours comparing taxonomy and spelling with books and online databases. Luckily these days are over - thanks to some recent R packages. Take for example the taxonstand package in R.
Installation: taxonstand is available on CRAN and can be installed directly from R:
In summary, taxonstand is a nice little package that might help you to clean and standardize your taxon names. But beware of its minor limitations.