Mikes the bug is a wolly mealy bug. The plant is in a pot I assume.......maybe post in on the citrus forum as there are a lot of people there that grow in pots. I have 15 citrus in the ground and have never seen leaves do that so I would just be guessing at the cause. Here is a link that might be useful: Citrus forum

They just look to me like the small dwarfed leaves that I always see on my apples. There are always some of them usually out near the canopy edge in a cluster of leaves. They are always undersized and more rounded than the others. You barely touch them and they fall off as though the tree has aborted them. I notice they just appear here and there. Those leaves do look bigger though. Anybody?

How about using the Optional Link URL slot provided here when you post to make it so a link to your pictures can be opened without cutting and pasting?

I like the Aronia (chokeberry) suggestion. The leaf shape and size are more similar to my Aronia than any of the native Prunus that grow here, including P. pensylvanica, P. virginiana, and P. americana.