Q-Z
Q-Z
| Quisqualis | Stylidium |
| Ramonda | Stylophorum |
| Ranunculus | Sutera (Bacopa) |
| Ratibida | Symphytum |
| Rehmannia | Symplocarpus |
| Reseda | Synthrysis |
| Rheum | Tagetes |
| Rhodanthe | Talinum |
| Rhodiola | Tanacetum |
| Rhodohypoxis | Tecoma |
| Rhodophiala | Telekia |
| Ricinus | Tellima |
| Rodgersia | Teucrium |
| Rohdea | Thalictrum |
| Romneya | Thelypteris |
| Roscoea | Thermopsis |
| Rosmarinus | Thunbergia |
| Rubus | Thymophylla |
| Rudbeckia | Thymus |
| Ruellia | Thysanotis |
| Ruta | Thysanotus |
| Sagina | Tiarella |
| Salpiglossis | Tibouchina |
| Salvia | Tigridia |
| Sandersonia | Tithonia |
| Sanguinaria | Torenia |
| Sanguisorba | Tovara |
| Santolina | Trachelium |
| Sanvitallia | Trachystemon |
| Saponaria | Tradescantia |
| Sarracenia | Tricyrtis |
| Sasa | Trifolium |
| Sauruma | Trillium |
| Saururus | Triplodenea |
| Saxifraga | Triteleia |
| Scabiosa | Triteleia (Brodiaea) |
| Scaevola | Trollius |
| Schizanthus | Tropaeolum |
| Schizostylus | Tulbaghia |
| Schoenia | Tulipa |
| Scilla | Tussilago |
| Scirpus | Tweedia |
| Scopolia | Umbilicus |
| Scrophularia | Uncinia |
| Scutellaria | Urospermum |
| Scuttelaria | Ursinia |
| Sedum | Uvularia |
| Selaginella | Valeriana |
| Selenium | Vallota |
| Semiaquilegia | Vancouveria |
| Sempervivum | Venidium |
| Senecio | Veratrum |
| Senna | Verbascum |
| Setcreasea | Verbena |
| Shortia | Vernonia |
| Sidalcea | Veronica |
| Silene | Veronicastrum |
| Silphium | Victoria |
| Silybum | Vinca |
| Sinarundinaria | Viola |
| Sinningia | Wahlenbergia |
| Sisymbrium | Waldsteinia |
| Sisyrinchium | Watsonia |
| Smilacena | Woodwardia |
| Solanum | X Amarcrinum |
| Soldanella | X Chionoscilla |
| Solidago | X Fatshedera |
| Sorghastrum | X Halimiocistus |
| Sparaxis | X Heucherella |
| Sphaeralcea | X Lychsilene |
| Spiranthes | X Solidaster |
| Stachys | Xanthorrhoea |
| Stachytarpheta | Yucca |
| Stellaria | Zantedeschia |
| Stellera | Zauschneria |
| Stenanthium | Zea |
| Stipa | Zephyranthes |
| Stokesia | Zigadenus |
| Streptocarpus | Zinnia |
| Streptosolen | Zizia |
| Strobilanthes |