| Sidalcea 'Party Girl' |
Prarie Mallow |
 |
| Silene (many) |
Campion, Catchfly |
 |
| Silene acaulis |
Moss Campion |
 |
| Silene alba |
White Campion |
 |
| Silene armeria |
Sweet William Catchfly |
|
| Silene asterias |
Catchfly |
|
| Silene coeli-rose |
Rose of Heaven |
 |
| Silene dioica |
Red Catchfly |
|
| Silene flos-jovis |
Jove's Flower |
|
| Silene keiskei |
Campion |
|
| Silene uniflora (maritima) |
Sea Campion |
|
| Silene schafta |
Moss Campion |
|
| Silene vulgaris |
Bladder Campion |
|
| Silene zawadskii |
Zawadski's Catchfly |
|
| Silybum marianum |
Milk Thistle |
|
| Sinocalycanthus chinensis |
Chinese Allspice, Chinese Wax Plant |
 |
| Sisyrinchium angustifolium |
Blue-eyed Grass |
|
| Soldanella |
Snowbell |
|
| Soldanella alpina |
Alpine Snowbell |
|
| Solenopsis (Laurentia) axillaris |
Blue Star Creeper |
|
| Solenostemon scutellarioides |
Coleus, Flame Nettle |
|
| Solidago 'Laurin' |
Golden Rod |
|
| Sollya fusiformis |
Bluebell Creeper |
|
| Sophora (many) |
Pagoda Tree |
|
| Sophora davidii |
David's Mountain Laurel |
|
| Sophora secundiflora |
Texas Mountain Laurel |
|
| Sophora tetraptera |
Kowhai |
|
| Sparrmannia africana |
African Hemp |
|
| Spathodea campanulata |
African Tulip Tree |
|
| Stachys (many) |
Stachys |
|
| Stachys (Betonica) officinalis |
Betony |
|
| Stachys sylvatica |
Wood Woundwort |
|
| Stapelia variegata |
Starfish Flower, Star Flower |
|
| Staphylea trifolia |
Bladdernut |
|
| Stelleria holostea |
Greater Stitchwort, Wedding Cake |
|
| Stephanotis floribunda |
Bridal Wreath |
|
| Sternbergia lutea |
Autumn Daffodil |
|
| Stokesia laevis |
Stokes' Aster |
|
| Strelitzia nicolae |
Bird of Paradise |
|
| Streptocarpus |
Cape Primrose |
|
| Styrax obassia |
Fragrant Snowbell |
|
| Succisa pratensis |
Devil's Bit Scabious |
|
| Sutherlandia frutescens |
Balloon Pea |
|
| Symphyandra (many) |
Bellflower |
|
| Symphyandra (Campanula) wanneri |
Ring Bellflower, Ringflower |
|
| Symphyandra zanzegura |
Rock Bellflower |
|
| Symphytum officinalis |
Common Comfrey |
|
