Sansulin is seedless and was imported from China to Australia a number of times with Tibby being featured in the stories as he obviously did it the right way and propagated. Linsansu is not seedless but has a small seed like several others. I have posted links of what they look like inside. There are allegedly several other seedless varieties around of lower quality. How they got their names is a bit hazy in most cases with the recent types.