so very white...

Addendum: Digging back through my incomplete records, I believe these are F3 (or F4) from seeds obtained in circa 2003 from a plant shared via the National Capital Area Chapter (probably by John B.). All the flowers I've seen from this line up until these few have been pale pink/lavender. However, it seems pale/almost-white flowers are not that unusual, and Kartuz lists S. muscicola with a mostly-white flower and the description: "White flowers flushed light purple."

~ ~ ~

Three of my Sinningia muscicola (formerly known as sp. 'Rio das Pedras') are blooming with the whitest flowers I've ever seen on this species.  By the time I grabbed a camera the flowers had fallen, so here they are lying on the foliage.

These are seed grown, either from seed from my plants or from plants open-pollinated in a greenhouse.  I don't have any of the other plants from that round of seed-sowing so I can't compare with their siblings. So what do I have here?  Species or hybrid?