The scientific name of the genus for a living or fossil organism. The
genus is a low-level taxonomic rank: the first part of the so-called scientific name (latin). This tag should be used in combination with natural=tree, natural=wetland or similar. It may also be appropriate to use it with natural=wood or landuse=forest.
It appears that most mappers write the genus value with a capital letter, e.g. Quercus or Picea. This follows the scientific convention for writing genus names.
Translated names of the genus=* tag are also in use, for example genus:de=* and genus:en=*.
Most common used values
see more on https://taginfo.openstreetmap.org/keys/genus#values
Possible tagging mistakes
wood=*‒ This tag has been deprecated.