He gives as instances (so I suppose there are other cases) eleven species, viz., 3.

Rumex, Poterium sanguisorba, Potentilla anserina, Medicago sativa, Taraxacum officinale, Marrubium vulgare, Plantago lanceolata, P.major, Lolium perenne.

All these are seeding freely.

Now I remember, years and years ago, your discussing with me how curiously easily plants get naturalised on uninhabited islands, if ships even touch there.

I remember we discussed packages being opened with old hay or straw, etc.