1. Erect dense shrub native to western Iberian peninsula having profuse white or pink flowers; naturalized in southwestern England
   - Spanish heath, Portuguese heath

Type of: erica, true heath

• genus Mutinus
• genus Mutisia
• genus Mya
• genus Myadestes
• genus Mycobacterium
• genus Mycoplasma
• genus Mycteria
• genus Mycteroperca
• genus Mylodon
• genus Myocastor
• genus Myopus
• genus Myosotis
• genus Myotis
• genus Myrciaria
• genus Myrica
• genus Myricaria
• genus Myriophyllum
• genus Myristica
• genus Myrmecia
• genus Myrmecobius
• genus Myrmecophaga
• genus Myrmeleon
• genus Myroxylon
• genus Myrrhis
• genus Myrsine