- Macdougal's Giant
- Macdougal's Ocotillo
- Macho Mocha
- Maguey
- Maguey Pajarito
- Malacocarpus erinaceous
- Mammillaria baumii
- Mammillaria candida
- Mammillaria carnea
- Mammillaria celsiana
- Mammillaria fittkaui
- Mammillaria geminispina
- Mammillaria guelzowiana
- Mammillaria lenta
- Mammillaria longiflora
- Mammillaria melanocentra
- Mammillaria montensis
- Mammillaria rhodantha
- Mammillaria rubrograndis
- Mammillaria saboae
- Mammillaria sempervivi
- Mammillaria standleyi
- Mammillaria wildii
- Mammillaria winteriae
- Mammillaria zielmanniana
- Mangle Dulce
- Mariola
- Mauto
- Mealycup Sage
- Melocactus ernestii
- Mescal Agave
- Mescal Bacanora
- Mescal Ceniza
- Mescalito
- Mexican Bird of Paradise
- Mexican Blue Palm
- Mexican Blue Sage
- Mexican Blue Yucca
- Mexican Buckeye
- Mexican Bush Sage
- Mexican Cliff Rose
- Mexican Elderberry
- Mexican Evening Primrose
- Mexican Feather Grass
- Mexican Fence Post
- Mexican Fire Barrel
- Mexican Gold Poppy
- Mexican Hat
- Mexican Honeysuckle
- Mexican Jumping Bean
- Mexican Living Rock
- Mexican Oregano
- Mexican Passionflower
- Mexican Penstemon
- Mexican Petunia
- Mexican Primrose Willow
- Mexican Sage
- Mexican Sunflower
- Mexican Wolfberry
- Mezcal Blanco