Article (misc)  (11 Dec 2010)  
 
Percy Wright Autobiography Volume II page 476:
Another plant at Moose Range which I was able to save at that time or thereabout was the Yellow Altai rose, sister of Hazeldean. It is a single, with a rather small flower, bright yellow when it first opens, but fading rather rapidly. It is less hardy than Hazeldean, but hardier than Harison's Yellow, and grows more finely branched. It is very fertile, and set many heps, which, however, are much smaller than the less numerous heps of Hazeldean, and with much smaller seeds. If it were pollinated by Hazeldean, or vice-versa, I'd get the F2 of the Altaica x Persian Yellow cross, which might have a considerable proportion of segregates susceptible to blackspot, but should be most interesting nevertheless. Unfortunately, seeds of Yellow Altai do not germinate easily.

Article (misc)  (1985)  
 
Walter Schowalter notes:
Yellow Altai - R. spinosissima x Harison's yellow. Height 6 feet, very hardy. Smallish, single, medium yellow flowers, sometimes producing heavily enough to cover the bush. Blooms once, sets seed freely.

Book  (1967)  Page(s) 46.  
 
Some All-Canadian Roses
by Fred Blakeney, Victoria, B.C.
Mr. Percy Wright of Saskatoon, Sask., must be considered one of the foremost hybridizers of species and near species roses in North America. He has been working on these roses for many years, and knows the reactions of various hardy roses when crossed with species roses.
His objective has always been to produce worthwhile garden roses that are hardy enough to withstand the extremely low temperatures of the Prairies in winter. [...]
Here is a list of Mr. Wright's originations in chronological order of introduction:
1950 "Yellow Altai", small golden flowers in clusters.

Book  (1949)  Page(s) 147-149.  
 
In "New Varieties for the Extreme North," by Percy H. Wright, Moose Range Saskatchewan, Canada:
Ever since 1935 I have been placing upon the Altai rose, R. spinosissima altaica, pollen taken from the famous old yellow brier, Harison's Yellow, and have produced many thousands of seeds. Their germination has been so poor, however, that I have got fewer than 100 plants...Yellow Altai, the results of my crossing R. spinosissima altaica with Harison's Yellow, is a genuine yellow, a tint lighter than Harison's Yellow, about the same depth of color as Double Yellow Scotch. It too is hardy and for a time is sure to fill a niche as the only hardy rose of satisfactory yellowness.

Website/Catalog  (1949)  
 
"YELLOW ALTAI* - same descent, [as Golden Altai - (Altaica x Harison's Yellow)] like the Altai rose in every respect except that the flowers are smaller and a true yellow. So far, this is the only truly yellow rose that is adequately hardy for Northern Saskatchewan."

Percy Wright Catalogue - Hardy and Semi-Hardy Roses - ca 1949 p. 7
Square brackets - mine

[Percy later described the pollen parent as Persian Yellow in personal correspondence to Walter Schowalter] - Margit
[In further correspondence it is noted that Dr. Patterson of the University of Saskatoon sent Percy the pollen used in this cross. Percy could not know with complete certainty which yellow rose the pollen came from. And we do not know if Dr. Patterson personally collected the pollen or merely sent a student out to get pollen from a yellow rose. Even today 'Persian Yellow' and 'Harison's Yellow' are confused with one another and often mislabeled.] - Margit.