Epithets
| rhombica | diamond-shaped |
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| rhombiformis | diamond-shaped |
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| rhomboidalis | diamond-shaped |
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| rhomboidea | diamond-shaped |
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| rigens | somewhat rigid |
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| rigescens | somewhat rigid |
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| rigidula | somewhat rigid |
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| ringens | gaping |
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| riparium | of river banks |
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| riparius | of river banks |
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| rivalis | growing by a stream or river |
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| rivularis | growing by a stream or river |
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| rivulus | growing by a stream or river |
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| rostrata | beaked |
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| rostratum | beaked |