Epithets
| uncinata | hooked |
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| uncinatum | hooked |
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| undata | wavy-edged |
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| undulata | wavy-edged |
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| unguicularis | with a claw |
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| unguiculatus | with a claw |
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| urceolata | pitcher-shaped |
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| urceolatus | pitcher-shaped |
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| urens | stinging |
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| urticifolia | leaves like stinging nettle |
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| urticifolium | leaves like stinging nettle |
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| utile | useful |
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| utilis | useful |
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| utriculata | with bladders |
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| utriculosa | with bladders |