Epithets
| infundibular | funnel-shaped |
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| insignis | remarkable |
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| integer | entire, untoothed |
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| integra | entire, untoothed |
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| integrifolia | leaves entire |
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| integrifolius | leaves entire |
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| involucrata | with a wrapper, covering |
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| involucratus | with a wrapper, covering |
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| isophylla | equal sized leaves |
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| isophyllus | equal sized leaves |
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| labiatus | lipped |
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| laciniata | deeply cut, lacy |
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| laciniatus | deeply cut, lacy |
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| lactea | milky |
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| lacteus | milky |
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| lacustris | growing by lakes or ponds |
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| laevigata | smooth |
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| laevigatus | smooth |
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| laevis | smooth |
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| lanata | woolly |
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| lanatus | woolly |
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| lanosa | woolly |
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| lanosus | woolly |
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| lanuginosa | downy |
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| lanuginosus | downy |