David,
they so vaguely remember each other that crosses have been failure. As things go nowadays, much more important would be to obtain self seed for new virus free stock in cultivation.
Of Zephyranthes grandiflora, 99.9% of the plants in cultivation are of the stock that does not set seed.
Rhodophiala montana and the other Chilean Rhodophialas deserve to be "tamed" and propagated from domestic seed to gradually select plants that are less wild and more adapted to cultivation.