You'd love my favourite nursery Mumsy.. It's stunning.If it is a naturalized wild flower, my knowledge will be limited. Your region may host a plethora of varieties unknown to me. You could pick a branch with flowers and leaves and take it to your local nursery and ask them. Ask someone that looks like they've been working there a long time and has grey hair. Often these local old timers are the ones that can identify your local flora. I will keep looking through my old books. Might find it yet.
They have a little cafe and rose seminars. This is all out in farm country. Beautiful.. absolutely beautiful.
What a good excuse you have given me to go

Other nurseries are big box stores and a few smaller stores but they don't specialize in plants like Cornhill Nursery does.