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with links to pages with entries about them
N~O
| Narrow-leaved Jerusalem Sage | Phlomis italica |  |
| Nasturtium | Tropaeolum hookerianum |  |
| Nasturtium | Tropaeolum majus |  |
| Nasturtium | Tropaeolum polyhyllum |  |
| Nasturtium | Tropaeolum sessilifolium |  |
| Natal Plum | Carissa macrocarpa | |
| Native Orange | Capparis mitchellii | |
| Nemesia | Nemesia caerulea (foetans) | |
| Nemesia | Nemesia strumosa 'Carnival' | |
| Nepal Iris | Iris decora | |
| Nerine | Nerine bowdenii | |
| Nettle-leaved Bellflower | Campanula trachelium | |
| Nevada Bitter Root | Lewisia nevadensis (alba) | |
| New Zealand Bluebell | Wahlenbergia saxicola |  |
| New Zealand Christmas Tree | Metrosideros excelsa | |
| New Zealand Lacebark | Hoheria | |
| Night-scented Stock | Matthiola longifolia | |
| Nile Tulip Tree | Markhamia lutea | |
| Nomocharis (many) | Nomocharis | |
| Nomocharis | Nomocharis aperta | |
| Northern Catalpa | Catalpa speciosa | |
| Old Man's Beard | Clematis vitalba | |
| Oleander | Nerium oleander | |
| Olympic Mountain Fleabane | Erigeron flettii | |
| One-sided Bottlebrush | Calothamnus quadrifidus | |
| Onion Grass (many) | Romulea | |
| Opium Poppy | Papaver somniferum | |
| Orange Jasmine | Murraya paniculata (exotica) | |
| Orchid Cactus | Epiphyllum | |
| Orchid Tree (many) | Bauhinia | |
| Orchid Tree | Bauhinia | |
| Orchid Tree | Bauhinia galpinii | |
| Oregon Grape | Mahonia aquifolia | |
| Oriental Alkanet | Alkanna orientalis | |
| Oriental Poppy | Papaver orientalis | |
| Oriental Skullcap | Scutellaria orientalis | |
| Osage Orange | Maclura pomifera | |
| Ox-eye Daisy | Bupthalmum speciosum | |
| Ox-eye Daisy | Leucanthemum vulgare | |
| Oyster Plant | Mertensia simplicissima | |
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