Aneuploidy In The Genus Rosa
(1960) Page(s) 259.
Rosa x involuta Sm. wilsonii (Borr.) Bak. ...from Mrs. R. Hurst's plant in Horsham, a cutting from the original wild hybrid near Bangor....Borrer's Rosa wilsonii of 1835 is believe to b e a chance hybrid between R. tomentosa Sm. and spinosissima L. (Wylie, 1951-1954...) It is a vigorous hexaploid forming a dense thicket by suckering. Its characters are intermediate between those of the parents with a preponderance of R. tomentosa, which contributed two-thirds of the complement of 42 chromosome.