Chlorogalum pomeridianum (Soap Plant)
This was an "Oh, that sounds cool" sort of purchase, that I immediately regretted. However, I later found that I liked the plant quite a bit. The scent is pretty strong for such small and relatively sparse blooms. Unlike most plants, they are closed during the day and open only after dusk in order to attract a particular moth that provides pollination.
These photos were taken on 5-19. I moved it into the ground soon after and it seemed to take nicely to its new location. The bloom is now done.