Epithets
| turbinatus | shaped like a toy top |
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| uberior | more abundant |
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| uda | moist |
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| udus | moist |
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| uliginosa | in marshes |
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| uliginosum | in marshes |
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| ulmaria | elm-like |
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| ulmarius | elm-like |
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| umbrosa | shady |
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| umbrosum | shady |
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| 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 |