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I think your right Bjørnar. This clump is just too vigorous and vulgar to be a wild Lilium species. It was initially purchased from Crûg Farm Plants in Wales. They grow a lot of wild lilies from seed and so I assumed that the identification must be right but I agree the plant they sell as xanthellum v. luteum looks nothing like the images of the wild species. Here is a link to xanthellum var. luteum in the Crûg Farm Plants nursery catalogue: http://mailorder.crug-farm.co.uk/?pid=10679
For those of you not on Facebook: Lilium yapingense.
It's from the type location, so it is indeed L. henrici - and yes, these are the plants I collected seeds from. That said, the pictures were taking in a shaded forest in pouring rain, so the petals may very well be more spreading in cultivation. Protologue below, note it clearly says "perianthium albidum [...] campanulatum".I'm heading to Huidong next, I suspect whatever Chen Yi has introduced of "henrici" originated there, thus they would in fact be L. huidongense.