Euphorbia Volunteer

I found this plant as a seedling growing under a greenhouse bench two years ago. It was about an inch high, had one tiny leaf, and almost no roots so I wasn't sure it would make it. It turned out to be a lovely plant. It was under some Euphorbia francoisiis and has the same growth habit so I assume it is a francoisii. This year it flowered for the first time. (IMG_1244)