|'HRG Mottled Gallica', maybe Belle de Crecy|
...or picoteed (edges in a contrasting color)...
|Variegata di Bologna|
People seem to react strongly to these unusual blooms, either loving or hating such bold contrasts of color. I confess that in my heart I find it difficult to love them because they seem a bit busy, but I appreciate them as a collector, and have found room for a few.
A lot of striped roses originate as genetic mutations (called "sports") of a solid color rose. When such mutations are stable (i.e. consistently producing striped flowers and not reverting to the original rose), they may be named and distributed to the rose-growing public.
Since these mutations are spontaneous and cannot easily be obtained through breeding, and sometimes even with vegetative propagation, roses with color quirks are a much rarer sight than solid color ones.
Most striped blooms I have seen age gracefully, fading gently to a nice soft color, as in the picture below, although striping is sometimes lost in an old bloom.
Of all the thousands of rose images I have taken there are only two (at right and below) that illustrate a rare process of a striped rose reverting to its solid color parent right in the middle of one bloom.
Both of these are of a Hybrid Tea called Careless Love, a striped sport of Red Radiance, which itself is a sport of Radiance, a solid pink Hybrid Tea (sheesh, this is complicated). In these pictures Careless Love is gradually reverting to its pink grandmother, Radiance, which is probably the most genetically stable of the three cultivars.
Above, whole canes of Careless Love (the striped rose) are producing sold pink blooms of Radiance. If these canes are not cut out entirely, with time the whole bush will revert, and little or no striping will occur. Interesting to see Nature at work.