My question is about a plant originally from my great grandfathers garden in northern Illinois. It is about 10-12 inches tall with long narrow leaves and a flower on the end of a long thin stem. Every night during the summer, the flowers would slowly open until fully bloomed. Within about 10 minutes the flowers shrivel and close. We have always called them 8 o'clocks, but I don't believe this is correct. Does anyone know anything about this type of plant?