great Pix of the Potato leaf ...
when does a variety become an actual other variety ....and not a "strain"
?? LOL
I guess if the fruit size/shape/ colour/ and various time till harvest and relative size of the plant is the same .....it is a "strain " ... ???? if only the leaf type varies ?
There sure are a whole lot more "strain"s out there than can be followed
easily from year to year ......