Sanicle Snakeroot (Sanicula marilandica) seems to like the shadiest parts of Skidmore Woods. I was lucky a little sun peeked in to give me ample light to take its picture. There's another Sanicula species that grows nearby, Long-fruited Snakeroot (S. trifoliata), but I've never been able to get a clear photo, the shade is so dark where it grows.
Here's one you won't see very often, Green Violet (Hybanthus concolor). I think the Skidmore Woods may be the only place it can be found in Saratoga County. It certainly seems to like it here: hundreds and hundreds of these plants carpet a section of woods. The flowers grow in the axils underneath the leaves, so you can't see them unless you lift up a leaf. They don't look very much like violets, do they?
From rarely seen (Green Violets) to ubiquitous: Wild Sarsaparilla (Aralia nudicaulis) grows just about everywhere. Everywhere there's light shade in the woods, that is. It's greenish-white flowers are borne in (typically) three umbels on a naked stalk separate from the leaf stalk. I have seen more than three umbels to a stalk, once as many as six. This plant is related to Ginseng (Panax quinquefolius), an endangered plant that also grows in the Skidmore Woods, but which blooms a little later. (And I keep its whereabouts a deep dark secret.)