Look at plants through various magnifications (10x in the above pic), and you start see a lot of hair. As it happens, this is the underside of a fresh Mockernut Hickory leaflet. These are particularly hairy; in fact, Carya tomentosa is named for its leaflet undersides being covered in dense short hairs (from the Latin tomentum). Those are some kind of aphids at work.

Check out that leaf edge:


40x. Serrate indeed.

Now, for comparison’s sake, here’s the underside of newly emerged leaflet of Pignut Hickory/Carya glabra. Glabra means hairless or smooth.

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