Diospyros virginiana: A tale of two species?

[SteadyStan]

I have seedlings growing from 2 sources. I suspect one is 90c and the other is 60c. The Lee Reich method below of distinguishing the two seems to work for my seedlings.
Additionally, hearing from one forum member who has used 90c and 60c for many years, both make a good rootstock. Both have occasional unexplained incompatibility

@ncdabbler

Lee Reich wrote that this was a distinguishing feature between the 90 chromosome northern type (fuzzy new leaves) and the 60 chromosome southern type (glossy new leaves). But others with more persimmon experience than I have contested this and say there’s no way to visually distinguish between the two types.