(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.
Agnes (R. rugosa X R. foetida "Persian Yellow").
Pollen nearly all sterile, but apparently a few fertile grains.
This lovely rose, only recently becoming well known in the United States, was produced in 1900 by the Canadian plant breeder, William Saunders, who was then Director of the famous Experimental Farm at Ottawa.  The flowers are a soft primrose yellow and semi-double.  They are delightfully fragrant, the odor being a blend of the heavy rugosa perfume and the almost medicinal scent of the Persian Yellow.  While very distinctive, it is quite similar to the delicate fragrance of most Tea Roses.  The foliage is similar to that of R. rugosa.  The variety is not only desirable for its beauty but for its extreme hardiness.  It has been reported as having come unscathed through winters which killed other Rugosa hybrids back to the ground.  In 1926 it was awarded the Van Fleet Gold Medal by the American Rose Society as being the most distinctive new rose originated in America.

(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.
Alice Aldrich 
Pollen fertility 50%.
From the appearance of this rose one might expect it to be the result of crossing the old-fashioned pink Moss Rose with R. rugosa.  The flowers are borne in clusters, the buds are pointed and open into fully double bright pink flowers.  The foliage is thin for a Rugosa hybrid, the bush is thorny and of a rather floppy habit.

(24 Jun 1932)  Page(s) 32-3.  
 
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.
Arnoldiana (R. rugosa X R. borboniana "General Jacqueminot").
Pollen nearly all sterile.
This was another of the hybrids produced by Jackson Dawson.  The flowers are single and of a brilliant shade of crimson.  The bush is a very vigorous grower.

(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.
Belle Poitevine
Pollen fertility 90%.
The flowers are large and semi-double, very similar to those of R. rugosa in appearance and verging too closely on magenta to be generally popular.  The variety is very hardy, however, and is a reliable bloomer.

(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.
Blanc Double de Coubert (R. rugosa X R. odorata).
Pollen fertility 35%.
This variety was originated by Cochet-Cochet and has been variously reported as a sport of R. rugosa alba, and as a result of a cross with another species.  The low pollen fertility would favor the latter interpretation.  As compared to Sir Thomas Lipton the foliage is darker green, the bush less shapely and the flowers larger.

(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.

(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.
F. J. Grootendorst (R. rugosa X R. multiflora "Mme. Norbert Levavasseur").
Pollen less than 10% fertile.
A hardy, everblooming rose.  The flowers are small, very double, and with notched petals, giving the effect of a small red carnation.  They are fragrant and are borne in clusters all through the summer.  The foliage is dark green, rugose, and leathery.

(23 Jun 1917)  Page(s) 40.  
 
Scotch Roses.
...From the garden of the Duke of Buccleuch at Dalkeith, near Edinburgh, the Arboretum received a few years ago a collection of Scotch Roses for which this garden was once famous.  A plant in this collection called Jupiter, with pale pink single flowers, and another called Lady Boilles with small pale yellow flowers are attractive and worth attention.  The Scotch Roses are with the other species in the general Shrub Collection.

(23 Jun 1917)  Page(s) 40.  
 
Scotch Roses.
...From the garden of the Duke of Buccleuch at Dalkeith, near Edinburgh, the Arboretum received a few years ago a collection of Scotch Roses for which this garden was once famous.  A plant in this collection called Jupiter, with pale pink single flowers, and another called Lady Boilles [sic] with small pale yellow flowers are attractive and worth attention.  The Scotch Roses are with the other species in the general Shrub Collection.

(24 Jun 1932)  Page(s) 30.  
 
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.
Lady Duncan (R. rugosa X R. Wichuraiana).
Pollen fertility 20%.
A vigorous trailing rose, useful for holding banks, but not suitable for growing on a trellis.  Flowers very large, fragrant, single and a vivid, clear pink.  Foliage dark green, resistant to black spots.  This was one of the hybrids produced by the Arboretum's first propagator, the late Jackson Dawson.