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Polycarpæa ,

Rheum,

Polycarpon,

Rhimanthus,

Polycnemum,

Rhodiola,

Polygala,

Rhododendrum, 2

Polygonatum,

Rhodora,

Polygonum,

Rhus,

Polymnia,

Ribes,

Polypodium,

Ricinus,

Polypogon,

Ricotia,

Polylrichum,

Rindera,

Pomaderis,

Rivina,

Pontederia,

Robinia,

Populus,

Roccella,

Porliera,

Rondeletia,

Portesia,

Rosa,

Portulaca,

Rosmarinus,

Portulacaria,

Rottboellia,

Potamogeton,

Rouvolfia,

Potentilla,

Royena,

Poterium,

Rubentia,

Pouchetia,

Rubia,

Prasium,

Rubus,

Prenanthes,

Ruellia,

Primula,

Rumex,

Prinos,

Ruppia,

Priva,

Ruscus,

Prostranthera,

Ruta,

Prunella,

Prunus,

Sabal,

Protea,

Saccharum,

Psidium,

Sagina,

Psoralea,

Sagittaria,

Ptelea,

Sagus,

Pteris,

Salicornia,

Pterocarpus,

Salix,

Pterotheca,

Salsola,

Pulmonaria,

Salvia,

Pultenæa,

Salvinia,

Punica,

Sambucus,

Pyrola,

Samolus,

Pyrus,

Sanguinaria,

Sanguisorba,

Quercus,

Sanicula,

Queria,

Sanseviera,

Santalum,

Rafflesia,

Santolina,

Rafnia,

Sanvitalia,

Rajania,

Sapindus,

Ranonculus,

Sapium,

Raphanus,

Saponaria,

Ravenala,

Sargassum,

Rcaumuria,

Satureia,

Rhagadiolus,

Saururus,

Rhamnus,

Saxifraga,