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Add more from last year...Raoulia lutescens. Of the really spectacular R. spp unfortunately i can only dream :-)
I am interested in the origin of your plant. Raoulia lutescens is considered a synonym of Raoulia australis which is what your plant is most likely to be. However Raoulia taxonomy is a bit messy with several undescribed species being recognized with tag names. There appears to be a least one other entity similar but different to Raoulia australis which typically forms a dense flat cushion with bright yellow flowers.