Silene stellata
Silene virginica 'Jackson Valentine'
Silene vulgaris
Silene wallichiana
Silene zawadzkii
Silphium asteriscus
Silphium glutinosum
Silphium gracile
Silphium integrifolium
Silphium integrifolium var. laeve
Silphium laciniatum
Silphium mohrii
Silphium perfoliatum
Silphium perfoliatum 'The Holy Grail'
Silphium pinnatifidum
Silphium radula
Silphium terebinthinaceum
Silphium trifoliatum
Simmondsia chinensis
Sinacalia tangutica
Sinningia 'Flair'
Sinningia 'Hoy's Airies'
Sinningia 'Invasion Force'
Sinningia amambayensis
Sinningia bulbosa