Enlaces Institucionales


4.24 Biological terms

Capitalize the scientific name of a phylum, order, class, family or genus, but not common names or the epithets referring to a species or subspecies, even if they are derived from proper names:

  • the phylum Arthropoda
  • the order Rosales
  • the genus Sporotrichum
  • the species Sporotrichum schenkii (second word denotes species)
  • The jaguar and the lion are members of the family Felidae.

See 6.11 Mathematical, statistical and scientific material for rules governing the italicization of biological classifications.

Capitalize proper nouns modifying a common name, except where usage has established the lower case:

  • Grayson lily
  • Cupid’s-delight
  • Queen Anne’s lace
  • Judas tree
  • Canada goose
  • Dutch elm


  • malpeque oyster
  • timothy grass