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Hi John,you aren't splitting hairs , however as I already wrote the lip of P. vietnamensis can have 2 or 3 rows of haired lamellae. Here is my plant and you can see there are just 2 rows. On Steve's picture are 3 rows (or 2 and 1/2 ). The main point is, that P. praecox has 5 rows. Not 2, not 3, not 2,5.And one thing more, because I'm not sure about origin of my plant I labelled it as P. aff. vietnamensis.