| Plant tribes (Hu - Hy) |
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| Geranianae > Linales > Hugoniaceae |
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| Linales > Humiriaceae > Humirioideae |
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| hop |
| Urticanae > Urticales > Cannabaceae |
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| Mexican tulip poppy, hunnemannia |
| Ranunculanae > Papaverales > Papaveraceae |
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| Gentiananae > Apocynales > Apocynaceae |
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| Orchidales > Orchidineae > Orchidaceae |
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| sandbox tree |
| Euphorbiales > Euphorbiaceae > Huroideae |
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| hyacinth |
| Amaryllidales > Hyacinthaceae > Hyacinthoideae |
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| Hydnorales > Hydnoraceae > Hydnoroideae |
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| hydrangea |
| Hydrangeales > Hydrangeaceae > Hydrangeoideae |
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| goldenseal, hydrastis, orangeroot, turmeric |
| Ranunculales > Hydrastidaceae > Hydrastidoideae |
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| hydrilla, waterthyme |
| Hydrocharitales > Hydrocharitaceae > Hydrilloideae |
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| common frogbit, hydrocharis |
| Hydrocharitales > Hydrocharitaceae > Hydrocharitoideae |
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| hydrocotyle, largeleaf pennywort, marshpennywort |
| Araliales > Hydrocotylaceae > Hydrocotyloideae |
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| false fiddleleaf, skyflower, waterpod |
| Solanales > Hydrophyllaceae > Hydroleoideae |
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| Hydropeltidales > Hydropeltidaceae > Hydropeltidoideae |
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| waterleaf |
| Solanales > Hydrophyllaceae > Hydrophylloideae |
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| Hydrostachyales > Hydrostachyaceae > Hydrostachyoideae |
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| hygrophila, starhorn, swampweed |
| Lamiales > Acanthineae > Acanthaceae |
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| filmy fern, ohiaku, palaihinahina, palailaulii |
| Hymenophyllineae > Hymenophyllaceae > Hymenophylloideae |
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| Arecanae > Arecales > Arecaceae |
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| henbane, stinking nightshade |
| Solanineae > Solanaceae > Hyoscyamoideae |
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| Asterales > Asteraceae > Hyoseridoideae |
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| hypecoum |
| Papaverales > Papaveraceae > Hypecooideae |
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| Aaron's beard, St. Peterswort, goldwire, nits and lice, orangegrass, st. johnswort, tinker's penny |
| Theales > Clusiaceae > Hypericoideae |
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| doum palm, hyphaene |
| Arecanae > Arecales > Arecaceae |
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| catsear |
| Asterales > Asteraceae > Hypochaeridoideae |
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| Juncanae > Cyperales > Cyperaceae |
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| star-grass |
| Asparagales > Hypoxidaceae > Hypoxidoideae |
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| Ranunculanae > Menispermales > Menispermaceae |
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| European hyssop, hyssopus |
| Lamiales > Lamiineae > Lamiaceae |
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