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Apparently early last century there was a lot of hybridising breeding done between Amaryllis belladonna and some of the Brunsvigias, then backcrossed to the belladonnas to create what are called "Multiflora hybrids". Plants such as 'Hathor White' are probably that type of plant, as they have fully round facing flowerheads, instead of the flowers all facing the same way on the straight belladonnas.