"Isa Murdock. R. altaica x double white spinosissima; thorny shrub to three feet; spinosissima type foliage, flowers double white, in some seasons tinged pink. Very free flowering over a fairly long season."
Dr Frank Leith Skinner papers Province of Manitoba Archives
"Isa Murdoch - A hardy double altai hybrid, grows to 3 feet tall, very free flowering, in bloom for about six weeks in June and July. The flowers are white, sometimes suffused or tipped with pink. Each....$2.00"