Anecdotally, it seems as though species of fauna and flora introduced to England and Wales during the Roman occupation are still more likely to be found near Roman settlements. Obviously, some introduced species, such as the rabbit, are now extremely widespread. But, for example Alexanders was introduced as a food plant, and still grows in profusion around Richborough Castle, the former Roman fort of Rutupiae. I have only ever seen the edible Roman snail in England in the grounds of a former Roman villa.

Has anyone studied this to see if there's actually a statistically significant correlation, 1,600 years on?

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    Well, plants and snails are slow, rabbits are fast. Maybe that is the correlation you are looking for? Sorry, could not resist it :-) – SJuan76 Apr 25 '17 at 9:41
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    I am not sure that this is properly and best answered in History.stackexchange, so have suggested closure in order to solicit other opinions. There is a time limit on question migration, however. – Pieter Geerkens Apr 25 '17 at 22:05
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    @SJuan76: Those edible Roman snails are still trying to find a way off the island. – Pieter Geerkens Apr 25 '17 at 22:10

There is an important probability that the flowers and other vegetables that were introduced by the Romans spread in the culture of the local inhabitants, after the end of the Roman era/occupation.

Thus, it is likely that if some ancient Roman settlements have a large concentration of these species, some other places that appeared after the Roman era might present concentrations of these species.

You should also consider that some species are likely to widespread in the territories, and the relief (mountains, rivers) will be the only obstacles to retain them in the area of former Roman settlements.

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