1. Not pierced
   "unpierced ears"

See also: uncut

• genus Opisthocomus
• genus Opuntia
• genus Orbignya
• genus Orchestia
• genus Orchis
• genus Orcinus
• genus Oreamnos
• genus Orectolobus
• genus Oreopteris
• genus Oreortyx
• genus Origanum
• genus Oriolus
• genus Orites
• genus Ormosia
• genus Ornithogalum
• genus Ornithorhynchus
• genus Orontium
• genus Ortalis
• genus Orthilia
• genus Orthopristis
• genus Orthotomus
• genus Orycteropus
• genus Oryctolagus
• genus Oryx
• genus Oryza