Im near Saint Louis Mo.
There is Thai basil, holy basil and Siam Queen (mainly). All are commonly used in Thailand. I grow Siam Queen and lime basil. Siam is a tad stronger than common Thai basil but otherwise its about the same. It can be swapped for regular Thai basil but not for holy basil. Holy basil is quite a bit different.
Lime/Lemon basil really smells like citrus. Its interesting in some dishes that use lime and basil.
There is Thai basil, holy basil and Siam Queen (mainly). All are commonly used in Thailand. I grow Siam Queen and lime basil. Siam is a tad stronger than common Thai basil but otherwise its about the same. It can be swapped for regular Thai basil but not for holy basil. Holy basil is quite a bit different.
Lime/Lemon basil really smells like citrus. Its interesting in some dishes that use lime and basil.