This is one of the plants featured in Douglas Justice's August 2019 in the Garden | UBC Botanical Garden blog. I like the sputnik-looking fruits.
I don't know if its the variety of cultivar? or just my plants but they never open any further than seen in the photo....
I don't think they do open much more than that. I posted some photos from UBC at July 25, 2012 - the first five minutes On the other hand, @Egan Davis just posted two flowers (really was posting the spider) on Facebook. One flower does have petals that are remarkably spread out. Maybe as soon as they get to that stage, they senesce and close up? In Garden Explorer (the August 2019 tour, but you can query Kirengeshoma once that tour is no longer available), this is listed as Kirengeshoma palmata Koreana Group. This should mean that what you are seeing are seedling selections that all have characteristics similar to the parent (the group definition is from the Vancouver Trees app). I think this means that individual cultivars are not identifiable.
I still think about your question. These Kirengeshoma in Stanley Park have had flowers for a while, but I haven't seen any open more than yours. This photo is from today.
