P. sagastegui  SKRABAL & WEIGEND

P. sanguinolenta MAST.

P. 'Sapphire' VANDERPL.

P. 'Scribble' M. VECCHIA

P. seemannii GRISEB.

P. 'Senta' L. ŠEVCÌK

P. 'Serena' M. VECCHIA

P. serratifolia L.

P. serratodigitata L.

P. serrulata JACQ.

P. sexflora JUSS.

P. sicyoides SCHLE. & CHAM.

P. ‘Shirley’ L. ŠEVCÌK

P. smilacifolia -

P .  xsmytheana W. SMYTHE

P. speciosa GARDN.

P. 'Spider' M. VECCHIA

P. ‘St. Rule’  -

P. sprucei MAST.

P. standley KILLIP

P. ‘Star of Bristol’ VANDERPL.

P. "Star of Clevedon’ VANDERPL.

P. ‘Star of Kingston’ VANDERPL.

P. 'Stella di Cremona' M. VECCHIA

P. 'Stradivarius' M. VECCHIA

P. suberosa  L.

P. subpeltata ORTEGA

P. subrotunda MAST.

P. subpurpurea JØRG. & HOLM-NIEL.

P. ‘Sunburst’ P. WORLEY

P. ‘Simply Red’ COR LAURENS