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What does it mean symbol x between 2 names? (I saw it in some places regarding to the peppermint names in Latin, for example on Wikipedia and on this site) enter image description here

  • It's a guess, but I think it's meant to indicate that it's an offspring of those. This is biology typography, and probably off-topic on ELL. – M.A.R. Apr 13 '17 at 18:05
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Technically, it's the multiplication sign, ×, not x. It indicates a hybrid name, one that indicates the plant or animal is a hybrid. The Wikipedia entry begins by saying

Peppermint (Mentha × piperita, also known as Mentha. balsamea Willd.) is a hybrid mint: a cross between watermint and spearmint.

so the scientific name is saying "this kind of Mentha that we call piperita is actually a hybrid of other things."

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