The plant shown above is Hymenocallis liriosme, a native of Texas. An email friend, Joe, sent this to me a few years ago. I first had this plant forty or so years ago from Thad Howard's Zephyr Gardens. I grow it as a pot plant, although it will survive the winter easily near the house foundation and maybe even out in the open if planted deeply. It probably benefits from a prolonged dry season. The sweetly scented flowers are very fragile: the staminal cup begins to show signs of wear shortly after the blooms open. It's about three feet high when in bloom, and the foliage suggests that of a garden amaryllis.