roseseek wrote:Multiflora and moschata may have reduced much of the mildew for Kordes, but on the West Coast, I avoid multiflora as much as possible because of the mildew.
I make it the invariable rule, whatsoever the plant with which I am working, to examine the seedlings attentively from time to time, to note whether any of them give evidence of infection by mildew or any fungous growth.
And any seedling that is seen to be subject to mildew is at once destroyed, regardless of the value of its other qualities.
The Botanical Gazette 96(2): 207 (1934)
EXPERIMENTAL DATA FOR A REVISION OF THE NORTH AMERICAN WILD ROSES
EILEEN WHITENEAD ERLANSON
3. HARDINESS AND CLIMATIC TOLERANCE.-Cultures at the Botanical Gardens of the University of Michigan showed that some of the roses of the Pacific Coast region were only partially hardy in southern Michigan. R. californica, R. pisocarpa, and R. gymnocarpa grew very slowly, seldom flowered, and were often cut back by frost or winter killed. R. woodsii was very variable in this respect. Plants or seedlings from British Columbia, Washington, the Rocky Mountains, and the Great Plains thrive in Michigan. Plants or seedlings from the arid Great Basin persisted in Michigan but were stunted; they lost their leaves during the summer drought and never flowered. These two physiologically different groups within R. woodsii show a parallel series of variations, and cannot be distinguished morphologically.
http://bulbnrose.x10.mx/Roses/breeding/ ... on1934.pdf
Bruneau, A., Joly, S., Starr, J. R., and Drouin, J. N. 2005. Molecular markers indicate that the narrow Québec endemics Rosa rousseauiorum and Rosa williamsii are synonymous with the widespread Rosa blanda. Canadian Journal of Botany, 83: 386–398.
Rosa rousseauiorum Boivin and Rosa williamsii Fern. are two rare roses in eastern Québec, whose taxonomic status is controversial. Morphological characters alone do not clearly differentiate these two taxa from each other or from the morphologically variable and widespread Rosa blanda Ait. We evaluated the taxonomic status of these two taxa, and of two other R. blanda segregates, Rosa subblanda Rydb. and Rosa johannensis Fern., through an analysis of RAPD, ISSR, and AFLP markers. We surveyed 86 individuals from 36 populations in eastern North America. Despite a high degree of polymorphism, principal coordinate analyses and the weighted pair group method with arithmetic averaging suggest no clustering of individuals that correspond to taxonomic boundaries. However, the closely related Rosa palustris Marsh. is clearly differentiated from the R. blanda s.l. taxa. When populations of R. blanda west of Québec are included, the principal coordinate analyses and Mantel tests indicate the presence of a significant eastwest geographic gradient. Analyses of molecular variation suggest that most of the observed variation occurs within taxa, rather than among taxa. A weak inter-taxon variation is nonetheless significant for RAPD and ISSR data, and a weak pattern dependent on geographical location is evident within the province of Québec. In accordance with studies based on morphological characters, molecular data indicate that R. rousseauiorum and R. williamsii should not be considered as species distinct from R. blanda.
The American Cockerell: A Naturalist's Life, 1866-1948 (2000) Page 104
Theodore Dru Alison Cockerell, William Alfred Weber
Almost the first thing we noticed, on getting off the train at Okeanskaja [Siberia], was an abundance of the familiar Rosa rugosa of our gardens. Here it is a wild plant, and it was very interesting to see that it was confined to the immediate coast, its thick leaves being an adaptation to maritime conditions, though retained when it is artificially grown inland. Maack, who explored the Ussuri country long ago, and collected the flora extensively, evidently did not visit the coast, for he did not get Rosa rugosa at all, but only species then referred to as R. cinnamomea and R. acicularis, very similar to our wild roses of the Rocky Mountains.. I looked for parasitic fungi on the R. rugosa at Okeanskaja, but found only a very sparing infestation, which Dr. Arthur tells me is Phragmidium rosae-rugosae Kasai, so far as it is possible to determine from the aecial stage alone.
Nature, Volume 117, Issue 2945, pp. 517 (1926).
Evolution of Rosa
Cockerell, T. D. A.
Thus the diploid R. rugosa, which I found to be a strictly sea-coast plant in Siberia, is a well-defined type specially adapted to its peculiar habitats but not extending even a few miles inland.
Paul Olsen wrote:Karl,
Let's keep in mind some of the origins of the collected Siberian Rosa rugosa that was established in the U.S. aren't definitely known.
Trans. Iowa State Hort. Soc for 1892 (27: 235-237, 1893)
Future of Roses in the Northwest
Prof J. L. Budd, Ames
"In 1882, the writer was much surprised to find varied forms of Rosa rugosa in Central Russia, even as far north as Kazan, on the Volga. Some of the best of these varieties were introduced and have been disseminated by the Agricultural College at Ames. These introductions have much interest in the way of showing that the great hardiness of the so-called Japan varieties of the rugosa came from the fact that their natal home was in North Central Asia. They are also superior to the Japan sorts on account of being less rampant in growing, with softer outlines, handsomer leaves and handsomer flower buds and flowers. Also some of them are hardier in the far north than those first introduced. The great success of Mr. Carman in crossing this interesting species has led us to extended work in this same line. During the past season we have crossed the blossoms of our best rugosa varieties, both single and half double, with the pollen of the best varieties grown at Des Moines and St. Louis in plant-house and in open air. With the crosses from Gen. Jacqueminot and other fine dark roses we have had fine success, as we have had also with some of our finest white and pink roses of the Hybrid Perpetual and Tea strains."
http://bulbnrose.x10.mx/Roses/breeding/ ... s1893.html
The Canadian Horticulturist 7(12): 286 (Dec 1884)
At the botanical gardens on the Volga the opinion was expressed that the species was indigenous to North Bokhara, and the plains of Asia west of the Altai ranges. However this may be, it is, and has been for ages, a favorite species on the East plain of Europe, and we have the best reason for believing that its varieties will take leading rank over our great plains in the near future. I will only add that the interminable prairies north of the Carpathian Mountains, and the Caucasus in Europe, have many varieties of the rose, with thick coriaceous leaves, like the rugosa, not known in this country, and which do not seem to be known in South Europe.
http://bulbnrose.x10.mx/Roses/breeding/ ... a1884.html
Paul Olsen wrote:'Hansa' - it originated from the Schaum and Van Tol Nursery, Boskoop, Holland. Named for the Hansa Nursery also located at Boskoop? Introduced in 1905, I find it's relatively quick development interesting, since Rosa rugosa was re-introduced to Europe in the 1870's after being initially introduced in 1796.
Paul Olsen wrote:"The advantage of these Russian Rugosas for rose breeders is much the same as the hybrids of R. rugosa and R. blanda that Percy Wright recommended."
What advantage? If you are referring to cold hardiness, let's keep in mind the disadvantages. Mainly, of course, the loss of repeat bloom in first generation seedlings but also a loss of disease resistance. Still, I 'd like to see more work combining Rosa rugosa and R. woodsii to develop more forms of Rosa rugosa hybrids, especially ones having a more attractive cane colour. It's certainly something I do every year.
"But what possibilities remain for the use of rugosa in the breeding of hardy everblooming roses? It would appear that if Rosa rugosa is first crossed with Rosa blanda, and then this hybrid is bred to Hybrid Teas or Floribundas, the dominance of rugosa's weak bud-stems and excessive thorniness is broken much more effectively than if repeated infusions are made with the tender roses to a similar degree of loss of hardiness.
The rose Therese Bugnet, which most of us regard as a Blanda Hybrid rather than a Rugosa Hybrid, is an example of the truth of the foregoing assertion. Its percentage of rugosa, however, is substantial, and it is to the rugosa element in its make-up that the fall blooming habit of the variety is due. The limited number of seedlings of Therese Bugnet raised to date suggests that the combination of good features achieved in it was due to an extremely rare and felicitous segregation, but this is no reason, of course, why the line should not be followed much further."
http://bulbnrose.x10.mx/Roses/breeding/ ... t1967.html
[We are rather astonished that Mr. Andre should not "be able to learn anything of the hedgehog" rose in England. One was well known there thirty years ago, and this one was R. Kamachatica. This rose by the way is well worthy of the attention of American cultivators, for the great richness of the large rosy petals, and for the delicious fragrance of the flowers, much sweeter than any rose we know. The genuine Rosa cinnamomea of the Rocky mountains not excepted.—ED. G. M.]
http://bulbnrose.x10.mx/Roses/breeding/ ... a1873.html
Proceedings of the American Academy of Arts and Sciences 8: 382 (1873)
146. Rosa Kamtschatica Vent Cels. t. 67. In fruit only; the strong shoots densely setose, and with immense dilated aculei. One or two smooth specimens also collected. An intermediate form is in Dr. Lyall's collection, from Vancouver's Island. The R. cinnamomea in Pl. Hartweg, to which Ventenat's plant is referred as a synonyme, is wholly different, and apparently R. Californica, Cham. & Schlecht.
https://books.google.com/books?id=BPwEA ... &q&f=false
It is remarkable that this species should have been hitherto placed in the vicinity of ROSA cinnamomea, which it does not resemble in the least, and that it should at the same time have been separated widely from ROSA ferox, which it approaches so nearly that the two can scarcely be discriminated by any describable permanent character, and yet no two species can be more truly distinct.
http://bulbnrose.x10.mx/Roses/Rose_Pict ... atica.html