Subject
- Specific Epithet: recurvans 31
- Specific Epithet: recurvata 1
- Specific Epithet: recurvirostre 1
- Specific Epithet: recurvirostrum 13
- Specific Epithet: recurvum 8
- Specific Epithet: reflexum 4
- Specific Epithet: repens 18
- Specific Epithet: reptans 2
- Specific Epithet: revolvens 12
- Specific Epithet: rhaptocarpa 2
- Specific Epithet: rhynchostegium 3
- Specific Epithet: rigidulus 1
- Specific Epithet: riparia 1
- Specific Epithet: riparioides 15
- Specific Epithet: riparium 14
- Specific Epithet: riparoides 1
- Specific Epithet: rivulare 17
- Specific Epithet: robustum 1
- Specific Epithet: roseum 8
- Specific Epithet: rostratus 20