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Wisteria sinensis
Wisteria is a woody, climbing vine. Although it is a climbing vine, it can be trained into a tree-like shape, usually with a wavy trunk and a flattened top. It can grow up to 20-30 meters (65-98 ft.). Leaves are shiny green, petals of its flowers are white, violet, or blue, with yellow spot in center. The flowers have a distinct sweet scent similar to grapes.
Native to China in the provinces of Guangxi, Guizhou, Hebei, Henan, Hubei, Shaanxi, and Yunnan, but was introduced to Europe and North America in 1816 and has secured a place as one of the most popular flowering vines for home gardens.
Different spelling Wistaria. It can live for over 100 years. This plant is a member of the pea family, and has seedpods that are actually legumes.
It is a wisteria sinensis. Wisteria sinensis 'alba' is the white-flowered version. I planted one of these in a garden a couple of years ago, and that was definitely blue/purple in colour. It's the most common colour, white is more unusual.
That's correct, one of the German common names under which it is known is Blauregen. I am not sure about the latin name. I found images on Wikipedia of Wisteria sinensis, but it's mainly white. However on EOL there are images of lavender colored versions. I am not really sure now.
I think your name is Blauweregen. I found another spotting from the Netherlands.