"Spp." is the abbreviation for "species." It means that the author is referring to all species in that given genus. Often it is also used when the author doesn't know the specific species but knows that it is in a certain genus; i.e., there are many plants in the genus Salvia, and they can all be lumped together in Salvia spp.
FAQ #9351
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What does the spp. at the end of a botanical name mean?
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