Nature, Volume 117, Issue 2945, pp. 517 (1926).
Evolution of Rosa
T. D. A. Cockerell

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.


The American Cockerell: A Naturalist's Life, 1866-1948 (2000) Page 104
Theodore Dru Alison Cockerell, William Alfred Weber

Our first excursion, under the direction of our guide and interpreter, Mr. Lavrushin, was to Okeanskaja, a sort of suburb about an hour's train journey distant, on the Gulf of Amur. It is not on the open ocean, as the name might suggest, but on a secluded and shallow bay, where the water is calm and warm, and the people come in great numbers during the summer to bathe. There is no town, properly speaking, but only a great number of small houses or cottages among the trees, often with very beautiful gardens. These summer cottages, known as datchas, are delightful places to spend the hot summer months, and the fare on the train, for those who have to work daily in the city, is very small. We were surprised, however, to hear a friend state that she and her little daughter wished to go to their datcha, but did not know whether they could, as it was necessary to get a medical certificate. I supposed of course that the certificate would show the absence of infectious diseases, but this was an entire misconception. The Communists had looked with displeasure on these evidences of bourgeois luxury, but concluded that it was quite legitimate for people to live at the seaside if they were out of health and needed recuperation. So far as we could judge, there was little difficulty in getting the required certificates, and the cure generally seemed to be extraordinarily rapid. But I am not the one to scoff, for it actually happened, later on, that a beatific day at Mme. Polevoi's was the turning point in a bad attack of bronchitis which I had developed in the hills.

Almost the first thing we noticed, on getting off the train at Okeanskaja, 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.