Old man's beard (Clematis vitalba) is an invasive plant in New Zealand that has an impact on indigenous biodiversity. It is declared an unwanted organism under the Biosecurity Act 1993 which means it cannot be sold, distributed or propagated. We are supposed to let the Council know if we see it. I haven't as yet. It is just round the corner from me on an abandoned property that has grown up to hide the house within!
You post the most interesting "Stuff" about the plants and animals and culture around you! Old Man's Beard, huh? I hope we do not ever see it here in the US, based on what you are saying. But it looks familiar .... Like I have maybe seen it before...oh no!