Polly, I had missed this post till now! That looks like some kind of Lycoris to me, could that be the ones you had that were producing autumn foliage and hadn't bloomed?
"...and don't think the garden loses its ecstasy in winter. It's quiet, but the roots are down there riotous." Rumi
It doesn't quite look the same as the pics I've been looking at of Rhodophiala bifida, the bloom shape and the size of the anthers looks off to me. Has it overwintered in your garden?
"...and don't think the garden loses its ecstasy in winter. It's quiet, but the roots are down there riotous." Rumi