| Family ID | Order ID | Name | Authorities | Num. of Familes | Num. of Genera | Num. of Species | Geo-Location | Growth/Forms | Overview |
| 193 | 45 | Napoleonaeaceae | A. Rich. | 2 | 18 | Tropical W. Africa | Trees, Shrubs | Napoleonaeaceae = Lecythidaceae. Also has been listed under Theales. |
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| 101 | 68 | Naucleaceae | (DC.0) Wernham | Madder or Coffee Family | 10 | 200 | Naucleaceae = Rubiaceae. Go to Rubiaceae for details. Also listed under Cornales |
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| 61 | 19 | Nyctaginaceae | Juss. | 30 | 390 | Tropical & warm areas. | Trees, Shrubs, Herbs | ||
| 97 | 23 | Nyssaceae | Juss. ex. Dumort. | 11 | Southern North America | Nyssaceae = Cornaceae Go to Cornaceae for details. |
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| 379 | 74 | Ochnaceae | DC. | 35 | 600 | Tropical areas, esp. in Brazil | Trees, Shrubs, Herbs | Has commercial wood | |
| 320 | 69 | Octoknemaceae | Pierre. or Van Teigh. or Soler. | 2 | 8 | Tropical Africa | Trees, Shrubs | Octoknemaceae = Olacaceae |
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| 321 | 69 | Olacaceae | Martinov | 27 | 180 | Tropical S. Africa | Trees, Shrubs, Herbs | Usually root-parasites, trees, lianes, shrubs. Some timbers. | |
| 322 | 69 | Olaceae | Horan | Tribe of Olacaceae, not separate family | |||||
| 355 | 72 | Oleaceae | Hofsgg. & Link. | Olive Family | 29 | 900 | Sub-cosmopolitan, esp. Asia | Trees, Shrubs | Many trees & shrubs, some with climbers characteristics. Has timbers. |
| 249 | 52 | Oliniaceae | Harvey & Sonder | Hard Pear | 8 | 10 | East & S. Africa | Trees, shrubs | Only 1 genus |
| 250 | 52 | Onagraceae | Juss. | Willow Herb Family | 21 | 650 | Temperate & warm areas in America | Trees, Shrubs, Herbs | Herbs & shrubs, rarely trees to 30 meters. Fuchsia woody. |
| 380 | 74 | Oncothecaceae | Kobuski ex Airy Shaw | 1 | 2 | New Caledonia | Trees, Shrubs | Only 1 genus, Oncotheca. | |
| 251 | 69 | Opiliaceae | (Benth.) Valeton | 10 | 32 | Tropical. Brazil | Trees, Shrubs, Lianes | Usually evergreen trees & shrubs, sometimes lianoid. Also placed under Myrtales |
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| 162 | 38 | Oxalidaceae | R. Br. | 6 | 775 | Tropical areas with few in temperate zones | Trees, Shrubs, Herbs | Small trees, shrubs, esp. herbs. | |
| 112 | 27 | Paeoniaceae | Raf. | Peony Family | 2 | 34 | Temperate Eurasia (10) & W. (2) North America | Shrubs, Herbs | Order placement is controversial. Very few species are woody. These include Paeonia delavayi, Paeonia ludlowii in China Tree peonies (P. suffruticosa) have a somewhat woody, persistent base and are usually taller than the herbaceous |
| 22 | 10 | Palmae | Juss. | Palm Family | 217 | 2800 | Tropical (with few in Africa) and warm areas. | Tree | Same as Arecaceae. Some timbers in some Palms. |
| 133 | 34 | Pandaceae | Engl. & Gilg, nom. cons. | 4 | 18 | Old World tropical areas | Trees & shrubs | Has also been listed under Pandales. Centroplacus, Microdesmis, Panda have wood |
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| 259 | 56 | Pandanaceae | Engl. & Gilg. or R.Br. | 3 | 875 | Old World tropical to New Zealand | Trees, Shrubs, Lianes | Trees or shrubs or lianes with clasping arial roots. Freycinetia, Pandanus, Sararanga has wood |
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| 188 | 44 | Papaveraceae | Juss. | Poppy Family | 26 | 2300 | N. Temperate areas | Tree/Shrub/Herb | Herbs, subshrubs, treelets./1 genus with 9 species as trees. Overall, very little woody elements. most are smaller plants. Bocconia, Dedromecon have woody members. |
| 98 | 23 | Paracryphiaceae | Airy Shaw | 1 | 1 | New Caledonia | Tree | Rather small tree. Only species is Paracryphia alticola (schltr.) Steenis. | |
| 411 | 77 | Passifloraceae | Juss. ex. DC. | 20 | 600 | Warm & tropical areas, esp. America | Trees, Shrubs, Lianes | ||
| 381 | 74 | Pellicieraceae | (Triana & Planchon) Bullock. | 1 | 3 | Central America. Costa Rica to Columbia & Caribbean Coast (rare). | Tree | A mangrove tree | |
| 382 | 74 | Pentaphylacaceae | Engl. | 1 | 3 | S.E. Asia, Malaysia | Tree | Small tree | |
| 134 | 34 | Peraceae | Klotzsch. | 1 | 40 | Mexico to S. America, Caribbean | Woody lianes (climbers) | Peraceae = Euphorbiaceae Go to Euphorbiaceae for details. Has commercial wood (pera glatbrata – Pilon Rosado) |
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| 231 | 50 | Peridiscaceae | Kuhlm. | 2 | 2 | Tropical America | Tree | 2 genera with 2 species as trees. Peridiscus, Whittonia, also included in Flacourtiaceae |
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| 154 | 37 | Periplocaceae | Schltr. | 45 | 200 | Trees, Shrubs, Lianes, Herbs | Periplocaceae = Asclepiadaceae See Asclepiadaceae for details |
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| 300 | 67 | Philadelphiaceae | D.Don or Martinov | 7 | 135 | Trees, Shrubs | Philadelphaceae = Hydrangeaceae Go to Hydrangeaceae for details. |
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| 9 | 1 | Phyllocladaceae | Bessey | Phyllocladus Family | 1 | 5 | Tasmania, N. Borneo, N. Luzon to New Guinea, New Zealand, Philippines | Tree | Also placed under Podocarpaceae. Evergreen softwood. Has timber, commercial wood |
| 62 | 19 | Phytolaccaceae | R.Br. | Pokeweed Family | 18 | 100 | Tropical & warm areas, esp. America | Trees, shrubs,lianes, esp. herbs. | Trees, shrubs,lianes, esp. herbs. |
| 312 | 87 | Picramniaceae | (Engl.) Fernando & Quinn | 2 | 50 | Tropical America | Trees, Shrubs | Listed questionably sometimes under Sapindales, Rutales. Order for this family not well defined. | |
| 135 | 34 | Picrodendraceae | Small | 1 | 3 | Caribbean | Tree | Picrodendraceae = Euphorbiaceae Go to Euphorbiaceae for details. |
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| 10 | 1 | Pinaceae | Sprengel ex. Rudolphi. | Pine Family | 12 | 220 | North Temperate zones | Trees, Shrubs | Trees & a few shrubs. The largest family of gynosperms . Very important timber trees. Wood from these trees find many popular uses, including construction, furniture, flooring and much more.. Highly commercial 9 genera & 170 species as trees. |
| 260 | 57 | Piperaceae | C.A. Agardh. or Giseke. | Pepper Family | 8 | 3000 | Tropical areas | Shrubs, sometimes lianes, herbs or small trees. | Shrubs, sometimes lianes, herbs or small trees. A complex family to determine which species are woody. |
| 340 | 70 | Pistaciaceae | C. Martius ex Perleb. or (Marcjand) Caruel. | 1 | 10 | Mediterranean, Asia, Malaysia, S. U.S., Central America | Trees, Shrubs | Pistaciaceae = Anacardiaceae Go to Anacardiaceae for details. |
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| 301 | 67 | Pittosporaceae | R. Br. | 10 | 2000 | Tropical & warm Old World, esp. Australia (6 species endemic) 2 other species extend to Malaysia & Old World tropics. |
Trees, Shrubs, Lianes | Tropical and Old World climates, esp. Australia | |
| 261 | 58 | Plantaginaceae | Juss. | 3 | 275 | Frigid to tropical areas. Cosmopolitan, predominately temperate areas | Herbs, less often shrubs. | Herbs, less often shrubs. Presence of woody species is probably minimal — but does have wood. | |
| 168 | 40 | Platanaceae | Lestib. or Dum. | Sycamore Family | 1 | 10 | N. hemisphere | Tree | All are trees & are in N. hemisphere. Deciduous. |
| 155 | 72 |