(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.  
...The two Rugosa hybrids raised by Dawson at the Arboretum have proved to be good garden plants.  In habit Lady Duncan resembles R. rugosa repens alba but the stems are not as stout; it can be used as ground cover or trained on an arbor or trellis.  The flowers are rather smaller than those of R. rugosa and pure pink, and the leaflets are smaller and very lustrous.  This Rose was obtained by crossing Rosa rugosa with R. Wichuraiana.

(25 Jun 1927)  Page(s) 52.  
 
Rugosa Hybrid Roses have a great future before them in the colder parts of New England since they combine great hardiness with handsome blossoms. The hardiness they get from the parent R. rugosa, a very old inhabitant of gardens, native of the northeast Asia littoral and abundant in Japan, where it is known as the Sea-tomato from the size and color of its fruits. Being a maritime plant it has special use for seashore gardens, and this combined with its hardiness give it a field of wide usefulness. Two Hybrid Rugosa Roses were raised in the Arboretum by the late Jackson Dawson. One, named Lady Duncan, obtained by crossing R. rugosa with R. Wichuraiana, is of trailing habit with glowing rose-pink blossoms. Another is R. arnoldiana, whose parents were R. rugosa and the Rose General Jacqueminot. The Arnold Rose is a bush with erect stems, good foliage, and large, rich red, single flowers.

(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 earliest of the Rugosa hybrids, Madam George Bruant [sic], has pure white semi-double flowers which continue to open until the coming of frost.

(24 Jun 1932)  Page(s) 30-2.  
 
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.
Max Graf (R. rugosa X R. Wichuraiana).
Pollen fertility 20%.
Very similar to Lady Duncan, and therefore probably of the same ancestry, although R. setigera has been reported as one of the parents.  The flower buds and foliage are slightly darker than those of Lady Duncan and the plant is somewhat more vigorous.  This hybrid was raised at the Bowditch Nurseries in Pomfret Center, Connecticut, and bears the name of a gardener who was with the firm for many years.  In the vicinity of Chicago, Max Graf has been used extensively as a bank cover in gardens along the Lake Michigan bluffs.  In eastern Missouri it has withstood successfully the cold winters and blazing summers of that trying climate.

(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.
New Century (R. rugosa X R. multiflora "Clotilde Soupert").
Pollen fertility 10%.
Flowers large, fragrant, flesh-pink and fully double.  Foliage light green.  This variety and Sir Thomas Lipton were both originated by the late Dr. Van Fleet of the U. S. Department of Agriculture, who is known particularly for his hybrid climbing roses, Silver Moon and American Pillar.

(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.
Nova Zembla 
Pollen fertility 20%.
This variety and the very similar Conrad Ferdinand Meyer are vigorous hybrids with fully double flowers resembling those of a hybrid tea or hybrid perpetual.  It has long-pointed buds, borne several in a cluster on stout stems and opening into a fragrant flower of pale shell pink.  It is almost too vigorous and requires severe pruning out of old canes to be kept within bounds.  It is sometimes planted as a hedge around rose gardens to form a background for the lower growing varieties.

(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 earliest of the Rugosa hybrids, Madam George Bruant [sic], has pure white semi-double flowers which continue to open until the coming of frost.  More distinct is the plant named Conrad Ferdinand Meyer which was raised in Germany.  This is a large shrub, with large, nearly double, clustered pink flowers.  The foliage and flowers show little Rugosa influence, but its vigor and hardiness are probably derived from the Japanese parent.  Nova Zembla is a white-flowered sport of this rose.

(1915)  Page(s) 24.  
 
Rosa spinosissima, var. altaica (or grandiflora) has not been hurst by the winter and has been full of flowers as usual. This is one of the largest and perhaps the handsomest of all the varieties of the so-called Scotch Rose. It is a native of Southern Siberia and in this climate often grows six or seven feet tall and broad. The flowers are faintly tinged with yellow and are produced in great numbers. It is one of the handsomest and hardiest of all single-flowered Roses which can be grown in northern gardens; and as the plant produces suckers freely, and as these are easily transplanted, there is no reason why this Rose should not be more common than it is in American gardens.

(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.  
...The two Rugosa hybrids raised by Dawson at the Arboretum have proved to be good garden plants. [...] The Arnold Rose, R. Arnoldiana, was made by Dawson, by crossing R. rugosa with the hybrid Tea Rose, General Jacqueminot.  It is a stout bush with good foliage and large, bright red, single flowers, and when in bloom perhaps the showiest of the Roses in the Shrub Collection. 

(25 Jun 1927)  Page(s) 52.  
 
Rugosa Hybrid Roses have a great future before them in the colder parts of New England since they combine great hardiness with handsome blossoms. The hardiness they get from the parent R. rugosa, a very old inhabitant of gardens, native of the northeast Asia littoral and abundant in Japan, where it is known as the Sea-tomato from the size and color of its fruits. Being a maritime plant it has special use for seashore gardens, and this combined with its hardiness give it a field of wide usefulness. Two Hybrid Rugosa Roses were raised in the Arboretum by the late Jackson Dawson. One, named Lady Duncan, obtained by crossing R. rugosa with R. Wichuraiana, is of trailing habit with glowing rose-pink blossoms. Another is R. arnoldiana, whose parents were R. rugosa and the Rose General Jacqueminot. The Arnold Rose is a bush with erect stems, good foliage, and large, rich red, single flowers.