| Plant subtribes (Io - Is) |
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| Violanae > Violales > Violaceae |
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| violet orchid |
| Orchidales > Orchidineae > Orchidaceae |
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| alamovine, jumbypotato, moonflower, moonvine, morning-glory, morningglory, railwaycreeper, red morning glory, scarletcreeper, star ipomoea, sweet potato, whitestar |
| Convolvulineae > Convolvulaceae > Ipomoeeae |
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| Arecales > Arecaceae > Iriarteeae |
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| blue flag, iris, stinking gladwyn |
| Iridaceae > Iridoideae > Irideae |
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| asp of Jerusalem, woad |
| Brassicaceae > Isatidoideae > Isatideae |
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| ischaemum, murainagrass |
| Juncanae > Poales > Poaceae |
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| Acanthineae > Acanthaceae > Isoglosseae |
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| Ranunculales > Ranunculineae > Ranunculaceae |
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