| Plant subtribes (Ho - Ho) |
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| Aranae > Arales > Araceae |
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| Asteranae > Asterales > Asteraceae |
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| barley, squirrel-tail grass |
| Poaceae > Hordeoideae > Hordeeae |
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| Lamiineae > Lamiaceae > Hormineae |
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| American featherfoil, hottonia |
| Primulineae > Primulaceae > Hottonieae |
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| hoya, porcelainflower, wax plant |
| Gentiananae > Apocynales > Apocynaceae |
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