Boy, that's a toughie! Did the cup ever show any color other than white? Neo. lactea and nivea have white cups, but they both have lavender flowers, not white.

Maybe someone else will recognize it.

Lisa,when I first saw the photo.I thought.'those lavender petals should help narrow it down'. I know everyone's eyes are different,but I see lavender there. Take a close look and see if you see it too. That would make your ID right on the mark.[anyone else see lavender petals?]
Bob

I would guess Big blue or one in that catagory(concentrica) that has been grown in a lot of shade or way over fertilized

If that's lavender, Bob, then it's very very veeeerrrrryyy pale lavender! ;-)

Actually, you're probably right, but neither the flowers or foliage really looks much like either of the 2 species I mentioned. I'm kind of leaning towards HDD's concentrica theory, just based on the form of the plant. Concentrica flowers can vary in color from purple to 2-tone to very pale lavender, and the cup color could be faded, or shade-grown as HDD suggests, although there is at least one white-cupped cv. (see link), so that is a possibility too.

There are a few hybrids with pale cups too, but you'd have to go through FCBS and find them. I don't remember any of the names.

Here is a link that might be useful: {{gwi:511995}}

the source of the plant and a picture including leaf tips would help some what

Hello,
Thank you for the answers, i think concentrica is a good way.I saw some purple inside but, yes, it is growing on a dark place. I cut a piece today, repot it in sphagnum moss and i will give more light.I send a close-up picture to see the color of the flower

Here is a link that might be useful: webshot

Ah, so it IS lavender. Your eyes must be better than mine, Bob!