on 5th May 2019 using Panasonic Lumix LX5
in macro mode.
on 7th June 2016 using Nikon D5200
with Sigma 150-500 mm zoom lens.
Latin Name :
Roadsides and wasteground.
May - September.
Try as I might this pretty thing has nothing to offer on folklore.
It's an invasive weed, period.