hyacinth) Mussaenda Mutisia Myoporum Myosotidium Myosotis (forget-me-not) Myrica Myriophyllum (milfoil) Myrrhis (sweet cicely) Myrsine Myrteola Myrtillocactus Myrtus (myrtle) N Nandina (heavenly bamboo) Narcissus (daffodil) Nasturtium (watercress) Nautilocalyx Nectaroscordum Neillia Nelumbo (lotus) Nematanthus Nemesia Nemopanthus (mountain holly) Nemophila Neobuxbaumia Neolitsea Neolloydia Neomarica Neoporteria Neoregelia Nepenthes (pitcher plant) Nepeta (catmint) Nephrolepis Nerine Nerium (oleander) Nertera Nicandra Nicotiana (tobacco) Nidularium Nierembergia Nigella Nipponanthemum Nolana Nomocharis Nopalxochia Nothofagus (southern beech) Notholirion Nothoscordum (false garlic) Notospartium Nuphar (spatterdock) Nymania Nymphaea (waterlily) Nymphoides (floating heart) Nyssa (tupelo) O Obregonia Ochagavia Ochna Ocimum × Odontioda (hybrid orchid genus) × Odontocidium (hybrid orchid genus) Odontoglossum (an orchid genus) Odontonema × Odontonia (hybrid orchid genus) Oemleria Oenanthe (water dropwort) Oenothera (evening primrose, sundrops) Olea (olive) Olearia (daisy bush) Olneya Olsynium Omphalodes (navelwort) Omphalogramma Oncidium (an orchid genus) Onoclea Ononis (restharrow) Onopordum Onosma Oophytum Ophiopogon (lilyturf) Ophrys (an orchid genus) Oplismenus Opuntia (prickly pears, chollas and many other cactus species) Orbea Orbeopsis Orchis (an orchid genus) Oreocereus Origanum (marjoram, oregano) Orixa Ornithogalum Orontium (golden club) Orostachys Oroya Ortegocactus Orthophytum Orthrosanthus Orychophragmus Oryza (rice) Osbeckia Osmanthus Osmunda (royal fern) Osteomeles Osteospermum Ostrowskia (giant bellflower) Ostrya Othonna Ourisia Oxalis (shamrock, sorrel) Oxydendrum Oxypetalum Ozothamnus P Pachistima Pachycereus Pachycormus Pachycymbium Pachyphragma Pachyphytum Pachypodium Pachysandra Pachystachys Pachystegia Pachystima Pachyveria (hybrid genus) Paeonia (peony) Paliurus Pamianthe Panax (ginseng) Pancratium (sea lily) Pandanus (screw pine) Pandorea Panicum Pansy Papaver (poppy) Paphiopedilum (slipper orchid) Paradisea (paradise lily) Parahebe Paraquilegia Parkinsonia Parnassia Parochetus Parodia Paronychia Parrotia Parrotiopsis Parthenocissus Passiflora (granadilla, passionflower) Patersonia Patrinia Paulownia Paurotis Pavonia Pedilanthus Pediocactus Pelargonium (geranium) Pellaea Peltandra (arrow arum) Peltoboykinia Peltophorum Peniocereus Pennisetum Penstemon Pentachondra Pentaglottis Pentas Peperomia Peraphyllum Pereskia Perezia Pericallis Perilla Periploca Perovskia (now included in Salvia) Pernettya (now included in Gaultheria) Persea Persicaria (fleeceflower, knotweed) Petasites (butterbur, sweet coltsfoot) Petrea Petrocosmea Petrophile Petrophytum Petrorhagia Petroselinum (parsley) Petteria Petunia Phacelia Phaedranassa (queen lily) Phaius (an orchid genus) Phalaenopsis (moth orchid) Phalaris Phebalium Phegopteris (beech fern) Phellodendron (cork tree) Philadelphus (mock orange) Philageria (hybrid genus) Philesia Phillyrea Philodendron Phlebodium Phlomis Phlox Phoenix (date palm) Phormium Photinia Phragmipedium (an orchid genus) Phragmites (reed) Phuopsis Phygelius Phylica (Cape myrtle) × Phylliopsis (hybrid genus) Phyllocladus (toatoa) Phyllodoce Phyllostachys Phyllothamnus (hybrid genus) Physalis (ground cherry) Physaria (bladderpod) Physocarpus Physoplexis Physostegia Phyteuma Phytolacca (pokeweed) Picea (spruce) Picrasma Pieris Pilea Pileostegia Pilosella Pilosocereus Pimelea Pimpinella Pinanga Pinckneya Pinellia Pinguicula (butterwort) Pinus (pine) Piper (pepper) Piptanthus Pisonia Pistacia (pistachio) Pistia Pitcairnia Pithecellobium Pittosporum Pityrogramma Plantago (plantain) Platanus (plane tree,