John, I think I had the same bulbs as you, from China, as I think they came in the same package that we shared! But I always thought they were Zephyranthes rosea (and so did Brian Mathew). It never occurred to me that they might be Habranthus robustus, so I never did a detailed check. One can generally tell between Habranthus and Zephyranthes, which are so much alike in appearance and behaviour, by two pointers:
In Zephyranthes, the flowers are upright, in Habranthus at a slight angle to the stem
In Zephyranthes, the stamens are of equal length; in Habranthus they are unequal.
Unfortunately their flowers are over now, so I can't check, but in this picture of the bulbs in question the stamens do look pretty equal - it's difficult to tell from the picture of Daisy's plants but the ovaries of the faded flowers do look vertical, if that means anything. Perhaps you could do some stamen measurements, Daisy!