Epithets
| quadrangulare | four-angled |
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| quercifolia | leaves like the oak |
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| quinquecostata | five-ribbed |
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| quinquecuspidata | five-pointed |
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| quinquefolia | leaves in fives |
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| 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 |