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Tristagma is a moderately tricky plant to grow in the UK (or not - see below!!).
Tristagma uniflorum seems to be recorded from quite a few 10km squares in the UK, specially in the south:
I have never seen the name Tristagma used for it - outside of the botanical world it is still Ipheon
(In the right clone/cultivar, it has a gorgeous scent).
It is Tristagma in Stace but the new Stace could have changed it again.
Wild Flower Society member
Yep - Tristagma it still is. Don't think it's been Ipheon for a long time.
BSBI VC Recorder
Lat/Lng: 52.4, 1.5
OS grid ref: TM4489