We are having a bumper crop of Spider Lilies this year. Apparently they are known as cluster amaryllis in Japan and bloom around the autumn equinox everywhere. They are also known as Surprise Lilies and, of all things, Naked Ladies. The leaves come up in spring and resemble monkey grass/liriope, which grows everywhere here. By the time the flowers appear, the leaves are long gone, hence some of the more colorful common names. I have read that they are sterile, but I have laid the spent flowers where I wanted to plant them, and gotten results the next year.