This form of author citation indicates that the epithet was originally published in another genus (in this case as "Cistus coridifolius") by the first author, Dominique Villars (indicated by the enclosing parentheses), but moved to the present genus "Helianthemum" by the second (revising) author (António Xavier Pereira Coutinho). Alternatively, the revising author changed the rank of the taxon, for example raising it from subspecies to species (or vice versa), from subgenus to Section, etc.Article 49 (Again, the latter is in contrast to the situation in zoology, where no authorship change is recognized within family-group, genus-group, and species-group names, thus a change from subspecies to species, or subgenus to genus, is not associated with any change in cited authorship).