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How thick are the leaves? University of Florida created a tetraploid plant by combining protoplasts of Hamlin and Flying Dragon. https://link.springer.com/article/10.1007%2FBF00272965
Hamlin x FD from Andreas Voss is a seedling of this hybrid. He got seeds from Riverside.
Finally this year there is one fruit hanging. I missed its flowers in the spring.
So, after a month in room the fruit is completely yellow.No seeds, rather thick albedo, skin has lemony perfume and lost most of poncirus like odor. Fruit is easy to juiceJuice has "soar" smell, no poncirus aftertaste, 12° Brix, bitter acidic taste, very faint barely perceptible internal oils.