" Netter" schreef

What does the L. and x mean in the following?

Origanum vulgare L.

Origanum x majoricum

Is there a reference that describes the meanings of such botany terms?

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In this case "L." is the author citation, with L. being the recommended
abbreviation for Linnaeus.

The multiplication sign "×" indicates hybrid origin.

No doubt there are many references describing usage of such terms. They are
regulated by the ICBN, the International Code of Botanical Nomenclature at
http://www.bgbm.fu-berlin.de/iapt/nomenclature/code, which is available
online, but not very userfriendly

PvR.