Epithets
| Name | Description |
|---|---|
| repandum |
curved up |
| repens |
creeping |
| reptans |
creeping |
| resinifer |
resinous |
| resinifera |
resinous |
| resinosa |
very resinous |
| resinosus |
very resinous |
| reticulata |
netted |
| retusa |
blunt, notched tip |
| revoluta |
rolled back |
| revolutus |
rolled back |
| rex |
king |
| rhizophylla |
rooting leaves |
| rhizophyllum |
rooting leaves |
| rhodotricha |
red-haired |
| rhombica |
diamond-shaped |
| rhombiformis |
diamond-shaped |
| rhomboidalis |
diamond-shaped |
| rhomboidea |
diamond-shaped |
| rigens |
somewhat rigid |
| rigescens |
somewhat rigid |
| rigidula |
somewhat rigid |
| ringens |
gaping |
| riparium |
of river banks |
| riparius |
of river banks |