Wildseed Farms sells the seeds. They will form a carrot-like tuber, which can be used to start more. The trailing stems will not root, and should be cut back to promote fall growth after they die back in the heat. Blooming season is Feb-July. A pkt of seeds sufficient to cover 545 square feet sells for $1.75. Germination is 28-56 days. The blooms will close each evening, and remain permanently closed after pollination. There are other forms of callirhoe that are more erect, like the standing winecups seen along Texas highways in spring.
Thanks eveybody-mine looks just like the picture in the plant data base! I think the plant survived from last year so it must be hardy here in zone 6a as well. I'll try to get some seeds saved if anyone is interested!