Your Blooms look very much like my "pass along" Amaryllis. Look at the last photo in my article "Growing Amaryllis in the Southern Garden". I once IDed them as "Voodoo", also sold as Naughty Lady: an old hybrid. What is unique is the 3 buds on the scape, which is unusual among H. hybrids. It is very hardy, seeds easily, and spreads rapidly.
