This is a depigmenting Tahitian gardenia. I noticed it because of the unusual combination of whiteness and translucency. I don't know what that's all about, but when I saw it I mounted the lens that can make closeups.
I think the depigmentation is because the blossom's on its way out. Logically it could be a process of pigmentation, but because it's of mature size I doubt that. I've never noticed anything like this, but that's because I don't spend time looking closely at Tahitian gardenias. My loss.
There are many insects on it. Maybe they've done this.