Subject
- Specific Epithet: mexicana 1
- Specific Epithet: microphyllum 11
- Specific Epithet: minakatae 1
- Specific Epithet: minor 8
- Specific Epithet: minus 3
- Specific Epithet: minutulum 5
- Specific Epithet: minutulus 1
- Specific Epithet: mnioides 2
- Specific Epithet: molle 1
- Specific Epithet: molluscum 21
- Specific Epithet: montanum 18
- Specific Epithet: mougeotii 10
- Specific Epithet: muehlenbergii 2
- Specific Epithet: muelleriana 10
- Specific Epithet: muellerianum 5
- Specific Epithet: muhlenbergianum 3
- Specific Epithet: multifida 4
- Specific Epithet: neesiana 3
- Specific Epithet: nemoreum 1
- Specific Epithet: nemorosa 4