Epithets
| Name | Description |
|---|---|
| rivularis |
growing by a stream or river |
| rivulus |
growing by a stream or river |
| rostrata |
beaked |
| rostratum |
beaked |
| rotata |
wheel-like |
| rotatus |
wheel-like |
| rotunda |
round |
| rotundata |
rounded |
| rotundus |
round |
| rubens |
red |
| ruber |
red |
| rubiginosa |
rusty |
| rubra |
red |
| rufa |
reddish brown |
| rufus |
reddish brown |
| rupestre |
found near rocks |
| rupestris |
found near rocks |