I thought it might be close, and a good starting place. Not sure if there are any more pics of PL on the AIS wiki, or not. If you still think it's a good possibility, after seeing some more pics, and reading the AIS, and HIPS descriptions, as to height, season, etc., the next step would probably be to find someone who grows PL, and see if they will either accept a piece of yours, or send you a piece of theirs, for comparison "in the garden". Sorry I can't help you, but, I don't grow PL, or even know anyone who does, but the "regulars" here will probably see this thread, so, ....maybe
, and you could also post on Cubits.....Arlyn