Cultivars
'Normalis'
This plant has single white flowers, considered the original species or type.

'Lutescens'
This plant has single yellow flowers.

'Alba-plena'
This vigorous semi-evergreen climber produces double white flowers with a violet- like fragrance. They appear singularly or in small clusters along the stems, throughout the summer. It tolerates an open sunny frost free position and grows on most well drained moist soils. 

'Lutea'
This plant has double yellow flowers that are not fragrant.