Digging on the Net for defunct rose company information, I unearthed an article contained in the John S. Armstrong Archive in Ontario, Ca which might be able to be found elsewhere.
“Rose Gigantea and Its Hybrids”, by H. Cayeux. The Journal of Heredity, vol. XX, No. 7. July 1929, trans. Mrs. Franklin Harris
I haven’t done any digging for it yet, but if someone has time and the interest, please feel free! Perhaps you might find it and reprint it here for us all to enjoy? Thanks.