1. Tropical and subtropical Old World epiphytic or lithophytic ferns
   - genus Arthropteris

Type of: fern genus

Part of: family Oleandraceae, Oleandraceae

• genus Mergus
• genus Meriones
• genus Merlangus
• genus Merluccius
• genus Merops
• genus Mertensia
• genus Meryta
• genus Mesembryanthemum
• genus Mesocricetus
• genus Mesohippus
• genus Mespilus
• genus Mesua
• genus Metasequoia
• genus Metroxylon
• genus Microcentrum
• genus Micrococcus
• genus Microdipodops
• genus Microgramma
• genus Micromeria
• genus Micromyx
• genus Micropogonias
• genus Micropterus
• genus Microsorium
• genus Microsporum
• genus Microstomus