| Arisaema japonicum | Cactus melocactus var. communis | Genus Cadaba | Genus Caelogyne | Genus Caesalpinia | Genus Cajanus | Genus Cakile | Genus Caladium | Genus Calamagrostis |

| Allodia simplex | Caecocassidias | Crangon septemspinosa | Ctenopoma fasciolatum | Didymodon michiganensis | Dolichopus renidescens | Gymnophania montana | Lycopodium selago var. porophilum | Perissodus microlepis |

| Mohrendorf | Mohrkirch | Moi | Moia | Moiano | Moidieu-Detourbe | Moigny-sur-Ecole | Moijabana | Moimacco | Moinesti |

| Moira Sound | Mojno Tank | Mokelumne Hill Post Office | Mokulau | Molamphy Park | Molasses Creek | Moli'i Pond | Moller Cemetery |