Nice picture do you have any more of it? side view and bottom would be appreciated. It looks like a phenome trait of Chinese origin. Pollen travels the world.
It is called cannabis chinensis. I have a "ace of spades" that does it on only a couple fan leaves, out of the entire plant. But it does it on every grow! (I keep taking a clone, of the plant, right before flower)
It is a pretty pheno as her buds are lavender tinted but not a good yielder. I hate to let it go but I'm growing one more and that's it.
2js, the bottom and side look no different than a normal fan leaf.