According to USPP386
R. wichuraiana x (R. multiflora x R. foetida bicolor)
Color.--When sepals first divide, sulphur yellow. When petals begin to unfurl, lighter. When half blown-full white.

The variety is characteristically a persistent grower and a profuse and abundant bloomer, rarely recurrent, the flowers being abundant throughout the blooming period which begins in June (northern Ohio) and lasts five to six weeks. During the blooming period the flowers are substantially consistent in quantity and quality.

I'm very sorry but I have put the wrong picture on the 'Polaris' rose because of the close spelling to 'Polareis' once again sorry.