Calibanus hookeri, a caudiciform member of the Agave family (Agavaceae) which we already said was maybe actually in the Lily family, but let’s not get that started all over again.
Here are the blooms. This is a male plant, as we can tell by the blooms. For some reason all our plants that we see bloom are male, and so that explains why we do not get seed.
As you can clearly see with this super slo-mo closeup, there are stamens there, composed of the little pollen-covered anthers on top of the slender filaments, but no pistils, i.e. the often quite graphic stigma in the center on top of the ovules.