(21 Jul 1920)  Page(s) 56.  
 
Chinese Roses.
Rosa bella, introduced by the Arboretum from northern China into western gardens, has never been injured here by the cold. It is a tall stout shrub which produces every year in June great numbers of large rose-red flowers followed by showy fruits. A good garden plant for cold countries, Rosa bella might in the hands of a skilful plant breeder have a useful influence in a new race of hardy Roses.

(24 Jun 1919)  Page(s) 38.  
 
Rose breeders are singularly reticent about the plants they have used in their work, and there appear to be no printed records of the parentage of any of the Rugosa hybrids with the exception of the two which have been created in this Arboretum.  
...One of the handsomest and most distinct of these hybrids was raised several years ago by Paul & Sons of Cheshunt, England, by whom it was named Rosa rugosa repens alba.  This plant has the foliage of Rosa rugosa, large flowers with petals between which there is more space than in the typical flowers of Rosa rugosa, and long, stout, prostrate stems.  In England standards with weeping branches have been successfully grown by budding this Rose on the tall stems of other Roses, and it would probably prove one of the hardiest standard Roses which could be grown here.  It can be trained over a fence or arbor, but can be best used to cover banks and the ground under other shrubs or small trees.  The Japanese Rosa Wichuraiana was at one time largely used as a ground cover in the Boston parks, but it has not always proved hardy, and Rosa rugosa repens alba is a better ground cover in this climate.  This Rose has been growing in the Arboretum for several years and has now been planted on the fence close to the entrance to the Arboretum nursery on Prince Street.

(24 Jun 1932)  Page(s) 33.  
 
Rosa rugosa and its hybrids.
...It would seem as though many of these Rugosa hybrids might be useful in producing new varieties of hardy roses. [...] For the convenience of those amateurs who are doing breeding work with roses, the pollen of the hybrids in the Arboretum's collection has been examined in the Cytological Laboratory.  In the following discussion the percentage of fertile pollen, as determined by microscopical examination, is reported for each hybrid where buds were available for study.
R. rugosa X R. ferruginea.
Pollen fertility 60%.
Flowers white and single, borne in clusters.  Foliage thin but tough.  The general effect is that of a tall, white-flowered wild rose.

(24 Jun 1932)  Page(s) 33.  
 
Rosa rugosa and its hybrids.
...It would seem as though many of these Rugosa hybrids might be useful in producing new varieties of hardy roses. [...] For the convenience of those amateurs who are doing breeding work with roses, the pollen of the hybrids in the Arboretum's collection has been examined in the Cytological Laboratory.  In the following discussion the percentage of fertile pollen, as determined by microscopical examination, is reported for each hybrid where buds were available for study.
Ruskin (R. rugosa X "Victor Hugo").
Pollen practically all sterile.
Ruskin is another of Dr. Van Fleet's hybrids.  It has fully double flowers of bright, dark crimson borne singly or in small clusters.  It is very fragrant and has leathery dark green foliage.

(24 Jun 1932)  Page(s) 34.  
 
Rosa rugosa and its hybrids.
...It would seem as though many of these Rugosa hybrids might be useful in producing new varieties of hardy roses. [...] For the convenience of those amateurs who are doing breeding work with roses, the pollen of the hybrids in the Arboretum's collection has been examined in the Cytological Laboratory.  In the following discussion the percentage of fertile pollen, as determined by microscopical examination, is reported for each hybrid where buds were available for study.
Schweidnitzia 
Pollen fertility 10%.
The flowers are white and semi-double.  The bush is low, the foliage dark green and leathery.

(24 Jun 1932)  Page(s) 32.  
 
Rosa rugosa and its hybrids.
...It would seem as though many of these Rugosa hybrids might be useful in producing new varieties of hardy roses. [...] For the convenience of those amateurs who are doing breeding work with roses, the pollen of the hybrids in the Arboretum's collection has been examined in the Cytological Laboratory.  In the following discussion the percentage of fertile pollen, as determined by microscopical examination, is reported for each hybrid where buds were available for study.
Sir Thomas Lipton (R. rugosa X R. multiflora "Clotilde Soupert").
Pollen fertility 20%.
Though this rose came from the same cross as did New Century, it has much more the appearance of the next variety on the list, Blanc Double de Coubert.  Like that variety its flowers are white and fragrant, sometimes showing a trace of pale pink in cloudy weather.  It is reported as being much more of a continuous bloomer than the other large-flowered Rugosa hybrids.  The foliage is dark green and glossy, the bush large and vigorous.  Its general effect in the landscape is very fine.