Pachysandra

Packera

Paeonia

Pandorea

Panicum

Papaver

Paradisea

Paris

Parrotia

Parrotiopsis

Parthenium

Parthenocissus

Passiflora

Patrinia

Paulownia

Peltoboykinia

Pennisetum

Penstemon

Pentaglottis

Periploca

Perovskia

Persicaria

Petasites

Petroselinum

Peucedanum

Phalaris

Phellodendron

Philadelphus

Philesia

Phillyrea

Phlomis

Phlox

Phoebe

Phormium

Photinia

Phuopsis

Phygelius

Phyla

Phyllanthus

Phyllocladus

Phyllostachys

Physalis

Physocarpus

Physostegia

Phyteuma

Picconia

Picea

Picrasma

Pieris

Pilea

Pileostegia

Pilgerodendron

Pinus

Pistacia

Pittosporum

Plagianthus

Planera

Plantago

Platanus

Platycarya

Platycladus

Platycodon

Platycrater

Pleioblastus

Pleione

Pleurospermum

Poa

Podocarpus

Podophyllum

Polemonium

Poliothyrsis

Polygala

Polygonatum

Polygonum

Polylepis

Polypodium

Polyspora

Polystichum

Pomaderris

Poncirus

Populus

Potentilla

Pratia

Primula

Prostanthera

Prunella

Prunus

Pseudocydonia

Pseudolarix

Pseudopanax

Pseudotaxus

Pseudotsuga

Pseudowintera

Psoralea

Ptelea

Pterocarya

Pterostyrax

Pulmonaria

Pulsatilla

Punica

Puschkinia

Pycnanthemum

Pyracantha

Pyrus