Daniel,
Before I let go of this aspect of the matter:
Ainslie: Materia Indica (1826) p 346
The rosa centifolia, which is, according to Dierbach, the Rodon of Hippocrates, and is the <?? , ??) of the Persians, is that chiefly employed in making both rose water and uttir. Those of the province of Kerman are of peculiar freshness.

Karl Koch (1879)
According to the recent researches of Mr. Baker of Kew the Rose of Adrianople is not in reality a Centifolia, but a Damask Rose, which alone supplies the true essence of Roses of Oriental India, Cashmere, and Morocco.

Rev. Pemberton (1918)
2. The Damask. R. centifolia, the Rose of Damascus, brought to France in the time of the crusaders, gives us the damask perfume. This fragrance is heavy, strong and positive, but not, in the writer's experience, diffusive. That is to say, this perfume does not seem to impregnate the air as does the musk; you have to take the Rose and smell it. But being so strong and positive in the individual flower, it has come to be regarded by many as the real Rose scent, and a Rose which has it not, although it may have another perfume, is apt to be deemed scentless or deficient in scent. It is from this perfume that attar of rose is manufactured—prior to the war this was a great Bulgarian industry. 

Old errors are hard to kill, and this one survived (at least in England) into the 20th century.

Another matter to consider is timing. Napoleon was finally locked away in 1815, which ended the blockade between the UK and the rest of Europe. Some gardeners and agriculturists ran to the docks to get passage on ships crossing the English Channel. Others waited a year or two or three to make their voyages.

I should mention that 1816 was the Year without Summer. This year was known in parts of the U.S. as "Eighteen-hundred and froze to death." It was cold, and many plants were destroyed. Nurserymen were very busy propagating, as well as introducing new plants from across the Channel.

And in the frenzy of importations and propagations, errors were made. The 'Bengal Bichonne' of Gauche (France) was mistakenly attributed to Joseph Knight of London. And some of Knight's several Crimson China seedlings have been credited to unknown French breeders. I also suspect that Knight's Yellow (tea-scented) China rose was really Dr. Cartier's 'Bengal Jaune'. Both were said to be self-seedlings of the Blush Tea-scented>

Finally, if the 'Duc de Wellington' illustrated in 1831 is supposed to be the same one offered for sale in 1817 ... well, there was time enough for some confusion to arise. In fact, it is also possible that the plant itself changed.

For example, 'Commandant Beaurepaire' was introduced as a vigorous, once-blooming "doubtful hybird". In time it became remontant and was reintroduced as 'Panachée d'Angers'. The newer name didn't stick, so we have the modified form under the old name.

Yes, but the fact is that in the 1750's both 'Quatre saisons' (a Damask Perpetual, see reply 5) and a China were widespread in Ile de France and in Bourbon Island. In this time, Fusée Aublet, a botanist to the king, cultivated "hedge banks" made of 'Quatre saisons' and of Rosa diversifolia (a China also called 'Sanguinea'). It is therefore not unlikely that these 2 roses gave birth to the Rosa borbonica 'Rose Edouard', according to Bréon. However, the mystery to me is that in the 1820s, in Rouen, Prévost was growing two different Bourbon roses 'Rose Edward 'and 'Rose Edouard'! He wrote that 'Rose Edward' was the first Bourbon to be imported in France (from Ile de France). Then, as we know, 'Rose Edouard' was imported from Bourbon Island by Neumann. What do we know about this 'Rose Edward' ?