Website/Catalog  (3 Nov 2016)  
 
http://bulbnrose.x10.mx/Roses/breeding/basye/Amphidiploid/Amphidiploid.html

A Probable Amphidiploid of Rosa abyssinica and Rosa rugosa....

Book  (1993)  Page(s) 67.  Includes photo(s).
 
[Listed under "Wild Roses and Their Cultivars"] Basye, USA, 1955. (Rosa abyssinica x Rosa rugosa) … this rose is similar in background to a Damask. Height: 7 ft. Scented.

Article (magazine)  (1987)  Page(s) 19.  
 
In the spring of 1955, I made the cross, R. abyssinica x R. rugosa. This is the story of how the union of these two diploids, each with 14 somatic chromosomes, yielded in the next generation a probable amphidiploid; that is, a tetraploid, each of whose cells contain 14 abyssinica chromosomes and 14 rugosa chromosomes.....
During the years 1964, 1965, and 1966, I grew ten seedlings of the diploid cross. To determine somatic chromosome counts I used leaf tips, which are more convenient to collect than root tips. I found that three were diploids, three were triploids (21 chromosomes), and four were tetraploids. I discarded the diploids and triploids and eventually saved only one of the tetraploids, bearing the number 67-305, as being the most likely candidate to be a true amphidiploid....
 I must be content with calling 67-305 a probable amplidiploid....
The bush is vigorous, up to six or eight feet, and appears to be intermediate between the ancestral parents. The flowers are single, an attractive bright pink, close to three inches in diameter, and occur in clusters of one to ten. They have little or no fragrance. Blackspot resistance is very good. As might be expected from the parentage, the armature of thorns is downright formidable.

Book  (1985)  Page(s) 82.  
 
One of the thorniest roses that ever graced my garden is a probable amphidiploid arising in 1967 as a tetraploid seedling of the diploid cross R. abyssinica x R. rugosa, which I made in 1955. In 1975 I applied to this horrendously thorny rose the pollen of 65-626. One of the seedlings, 77-361, was not only thornless and free of bristles but had perfectly smooth midribs!
...The three roses above described, 65-626, 77-361 and the probable amphidiploid are now growing in the Huntington Botanical Garden.