| Plant tribes (Io - Is) |
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| Solanales > Solanineae > Solanaceae |
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| Aquifoliales > Icacinineae > Icacinaceae |
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| alamovine, jumbypotato, moonflower, moonvine, morning-glory, morningglory, railwaycreeper, red morning glory, scarletcreeper, star ipomoea, sweet potato, whitestar |
| Solanales > Convolvulineae > Convolvulaceae |
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| Arecanae > Arecales > Arecaceae |
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| blue flag, iris, stinking gladwyn |
| Iridineae > Iridaceae > Iridoideae |
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| Rutanae > Rutales > Irvingiaceae |
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| bloodgrass, isachne |
| Juncanae > Poales > Poaceae |
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| asp of Jerusalem, woad |
| Capparineae > Brassicaceae > Isatidoideae |
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| Rubiineae > Rubiaceae > Isertioideae |
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| Merlin's grass, quillwort |
| Isoetineae > Isoetaceae > Isoetoideae |
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| Lamiales > Acanthineae > Acanthaceae |
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| Begoniales > Begoniineae > Begoniaceae |
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