| Family ID | Order ID | Name | Authorities | Num. of Familes | Num. of Genera | Num. of Species | Geo-Location | Growth/Forms | Overview |
| 167 | 40 | Hamamelidaceae | R. Br. | Witch-Hazel family | 30 | 95 | Widespread but chiefly subtropical, esp. E. Asia | Tree/Shrub | Has commercial timbers |
| 353 | 72 | Henriqueziaceae | Bremek. | 7 | Brazil: Amazon | Henriqueziaceae = Rubiaceae For details, see Rubiaceae. |
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| 184 | 48 | Hernandiaceae | Bercht. & J. Presl. | 5 | 57 | Tropical areas | Trees, Shrubs, Lianes | Has also been listed under Laurales. | |
| 242 | 52 | Heteropyxidaceae | Engl. & Gilg. | 1 | 3 | Central & S. Africa | Small trees | Heteropyxidaceae = Myrtaceae. Only 1 genus, Hexapyxis. |
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| 210 | 48 | Himantandraceae | Diels. | 1 | 23 | E. Malaysia to N. Australia | Tree | :Large aromatic trees. | |
| 332 | 70 | Hippocastanaceae | A. Rich. | Horse-Chestnut Family | 2 | 15 | Widely scattered throughout north and south temperate zones | Tree/Shrub | Some timber |
| 72 | 21 | Hippocrateaceae | Juss. | 21 | 280 | Africa | Hippocrateaceae = Celastraceae For details, go to Celastraceae |
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| 407 | 77 | Hoplestigmataceae | Gilg. | 1 | 2 | West Central Africa | Tree | ||
| 480 | 50 | Huaceae | A. Chev. | Garlic Tree Family | 2 | 3 | Africa | Tree | The trees have a garlic smell. |
| 361 | 73 | Humbertiaceae | Pichon | Madagascar | Humbertiaceae = Convolvulaceae Go to Convolvulaceae for details |
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| 198 | 47 | Humiriaceae | A. Juss. | 8 | 50 | Tropical S. America to Costa Rica, W. Africa | Shrubs, Trees | Has commercial woods | |
| 298 | 67 | Hydrangeaceae | Dumort | Hydrangea Family | 19 | 260 | Northern temperate zones to Malaysia | Trees, Shrubs, Herbs, Lianes | Many cultured ornamental shrubs. |
| 362 | 73 | Hydrophyllaceae | R.Br. | Waterleaf Family | 20 | 270 | Subcosmopolitan (except Australia), esp. W. North America | Shrubs, Herbs | Wood exists in genera Eriodictyon, Wigandia |
| 408 | 34 | Hymenocardiaceae | Airy Shaw | 6-7 species in tropical & South Africa, 1 species in S.E. Asia to Sumatra | Has been listed under Violales. Close to Ulmaceae in nature. | ||||
| 73 | 21 | Icacinaceae | (Benth.) Meyers | 52 | 400 | Tropical areas, few in temperate areas | Trees, Shrubs | Has commercial wood. Also listed under Celestrales | |
| 185 | 44 | Idiospermaceae | S. T. Blake | 1 | 1 | Australia | Trees | Idiospermaceae = Calycanthaceae Go to Calycanthaceae for details. |
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| 171 | 41 | Illiciaceae | R. Sargentia or (DC) AC. Sm. | Star Anise Family | 1 | 42 | S.E. U.S. to Hispaniola, India to Korea, West Malaysia | Tree/Shrub | Aromatic evergreen trees & shrubs. Has wood. Only 1 genus, Illicum, with 42 species. |
| 311 | 87 | Irvingiaceae | (Engl. ) Excell & Mendonca | 3 | 20 | Tropical Old World | Tree | ||
| 299 | 67 | Iteaceae | J. Agardh | 2 | 17 | Himalayias to Japan, west Malaysia, East North America | Evergreen Trees & Shrubs | Iteaceae = Grossulariaceae See Grossulariaceae for details. |
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| 199 | 47 | Ixonanthaceae | (Benth.) Excell & Mondonca | 4 | 21 | Tropical areas. S.E. Asia, Malaysia | Trees, shrubs | Has also been listed under Geraniales. | |
| 173 | 42 | Juglandaceae | DC ex. Perleb. | Walnut Family | 8 | 63 | Temperate & warm N. America to S. America & Malaysia | Trees, Shrubs | |
| 333 | 70 | Julianaceae | Hemsley | 2 | 5 | Central America, Peru, Mexico, Western half of S. America | Trees, Shrubs | Julianaceae = Anacardiaceae See Anacardiaceae for details. |
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| 334 | 70 | Kirkiaceae | (Engl.) Takht. | 2 | 6 | S. Africa, Madagascar | Has also been listed under Rutales | ||
| 50 | 18 | Koeberlinaceae | Engl. | 1 | 1 | S.W. North America | Trees, Shrubs | Koeberlinaceae = Capparidaceae For details see Capparidaceae. |
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| 436 | 59 | Krameriaceae | Dumort | 1 | 25 | Warm America, Argentina, Chile | Tree, Shrubs, Herbs | Only 1 genus, Krameria. Has wood | |
| 178 | 43 | Labiatae | Juss. | 251 | 6700 | Cosmopolitan but esp. Mediterranean to Central America. Very rare in N.Z. | Shrubs & herbs, rarely trees. | Has important timbers. This family also is well known for contributing fine flavorings, scents and medical compounds. | |
| 409 | 77 | Lacistemataceae | C. Martius | 2 | 27 | Trees, shrubs | 2 genera with 20 species are trees. 2 genera with 20 species are trees. Lacistemataceae = Flacourtiaceae. Go to Flacourtiaceae for details. |
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| 211 | 48 | Lactoridaceae | Engl. | 1 | 1 | Juan Fernandez | Shrub | 1 genus with 1 species. EXTREMELY ENDANGERED. Has woody anatomy | |
| 484 | 43 | Lamiaceae | Martinov | Labiatae Family | 160 | 3500 | New name = Labiatae Juss. (even though the order is Lamiales). See Labiatae for details. | ||
| 277 | 63 | Lardizabalaceae | Ruiz & Paavon or R.Br. | 8 | 45 | Himalayas to S.E. Asia, Taiwan, Central Chile | Shrubs, Lianes | Cultured ornamentals & some edible fruits. | |
| 186 | 48 | Lauraceae | Juss. | Laurel Family | 54 | 2850 | Tropical & warm areas, esp. in S.E. Asia & Brazil | Evergreen trees, shrubs | Also listed under Laurales. Has commercial wood |
| 191 | 45 | Lecythidaceae | Poit. | 20 | 285 | Tropical areas, esp. S. American Amazon basin | Trees, Shrubs | Has timber in at least 6 genera | |
| 283 | 65 | Leeaceae | (DC.) Dumort | 1 | 34 | Old World tropical areas | Shrub | Erect shrubs. 1 genus with 34 species. Has wood | |
| 140 | 35 | Leguminosae | Juss. | Legume Family | 650 | 18000 | Cosmopolitan | Trees, Shrubs, Lianes, Herbs | Very large family. Many woody and timber species. |
| 336 | 70 | Leitneriaceae | Benth. | 1 | 1 | S.E. U.S. | Trees, Shrubs | Leitneriaceae = Simaroubaceae. Go to Simaroubaceae for details One species called Florida Corkwood. |
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| 194 | 46 | Liliaceae | Juss. | Lilly Family | 288 | 4950 | Cosmopolitan, esp. dry, temperate areas | Herb | |
| 200 | 47 | Linaceae | DC ex Perleb. | 14 | 290 | Cosmopolitan | Trees, Shrubs, Lianes, Herbs | Some timbers | |
| 375 | 74 | Lissocarpaceae | Gilg. | 1 | Tropical S. America | Tree | Formerly included in Ebenaceae. Only 1 genus, Lissocarpa with 34 species. | ||
| 410 | 77 | Loasaceae | Juss. ex DC | 15 |