Epithets
| apetalus | without petals |
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| aphylla | leafless |
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| aphyllus | leafless |
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| apiculata | abrupt short point |
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| apiculatus | abrupt short point |
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| apiifolia | parsley-leaved |
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| apiifolius | parsley-leaved |
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| aquatica | in water |
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| aquaticus | in water |
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| aquatilis | living in water |
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| aquea | clear like water |
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| aqueus | clear like water |
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| aquifolia | holly like |
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| aquifolius | holly like |
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| aquilegifolia | leaves like the genus Aquilegia |
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| aquilegifolius | leaves like the genus Aquilegia |
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| arachnoides | like a spider or spider's web |
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| arborescens | tree like |
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| arboricola | living in trees |
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| arbuscula | dwarf tree |
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| arcana | closed |
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| arcanus | closed |
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| arenaria | relating to sand |
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| arenarius | relating to sand |
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| arenicola | living in sand |