The L. stands for Linnaeus. He gave the plant its name. He was the
first one to start naming plants like this so you see an "L." after the
names of a lot of plants.

Xavier Vanbecelaere wrote:

I have a question concerning the Latin names

Where does the "L." stands for

example: Ceratonia Siliqua L.
Olea Sylvestris L.

Are there other Letters like these used?

Regards,

Xavier.