1. Of something totally lacking in saturation and therefore having no hue

See also: achromatic, neutral

• genus Menticirrhus
• genus Mentzelia
• genus Menura
• genus Menyanthes
• genus Menziesia
• genus Mephitis
• genus Mercenaria
• genus Mercurialis
• 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