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This is Sea Plantain. At MPC it appears to be introduced (probably from UK with building materials), though this is not completely certain.
Confusingly it is also present at Chartres, where it is thought to be native - it's a widely distributed species, native to temperate regions in both the northern and southern hemispheres.
Whilst we are confident about the status of most species, there are a very few, such as this, where it's not always clear.
Lat/Lng: -51.79568333, -58.494030555