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