Epithets
| repandum | curved up |
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| repens | creeping |
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| reptans | creeping |
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| resinifer | resinous |
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| resinifera | resinous |
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| resinosa | very resinous |
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| resinosus | very resinous |
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| reticulata | netted |
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| retusa | blunt, notched tip |
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| revoluta | rolled back |
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| revolutus | rolled back |
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| rex | king |
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| rhizophylla | rooting leaves |
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| rhizophyllum | rooting leaves |
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| rhodotricha | red-haired |