Hey just a guess here, but it looks like a Japanese Snowbell to me.
Styrax Japonicus, I'm pretty sure it's in the Styrax family, did you smell it? When it's dried it's ground and then pressed into molds and used as a sweet base for lots of different incenses. But it also looks like a Halesia, which is also called a Snowbell but also called Silverbells. The yellow center is throwing me a little. I've seen white and light pink, but if it's in Japan then they might have been doing some mutant dna transmorgiphying, ya know like in Godzilla...... just teasing. Old Geezer Rick in WNC