Epithets
| quinquenervia | with five veins |
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| racemosa | with racemes |
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| racemosum | with racemes |
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| radicans | with stems taking root |
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| radula | scraper-like |
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| ramiflora | flowers on older branches |
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| ramosa | branched |
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| ramosum | branched |
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| recta | erect |
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| recti- | erect |
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| rectus | erect |
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| recurvatus | curved back |
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| recurvus | curved back |
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| rediviva | coming back to life |
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| redivivum | coming back to life |
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| redolens | scented |
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| regalis | royal |
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| regia | royal |
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| regina | queen |
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| reginae | queen |
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| regius | royal |
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| religiosa | sacred |
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| religiosus | sacred |
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| reni- | prefix meaning "kidney" |
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| repanda | curved up |