This plant was included in some ground cover that was given to me a few years back. I didn't know it was there - it just grew up as a volunteer. I transplanted it to this pot and it's been there ever since. I just don't know what it is. I've posted a photo of the whole plant and then a close up of the flowers. The flower stalks get quite tall and the blooms close up in the afternoon heat and open up again in the morning. Any ideas and thanks in advance.