Ducher
This excellent China is one of the first to bloom in spring and keeps on blooming throughout the season in flushes.  The plant is gracefully arching to about 4 1/2 x 4 1/2' in my garden and has few thorns and narrow, flexible canes.  It has excellent blackspot resistance.  The blooms are a pristine white and are medium sized.  Bred in 1869, hardy from zone 7.