Nice picture

Wisteria can get a little confusing as with so many plants. There are about eight species if I recall correct BUT a lot of cultivars. Some of them are listed here
http://www.wisteria.it/wisteria-e.htm but I have never looked for a complete list myself. Soil should be free draining on any Wisteria and damp "not" wet(what mine used to prefer). I find they are happy being treated similar to Azalea less the Nitrogen. It is more complicated to figure out what you have then to take care of

As with other plants some cultivars may prefer different sun exposure and were most likely made so. I was thinking about the ones I will be collecting there in the Spring while looking at a pot of Poison Ivy - They really have a lot of similar growth traits
Grimmy