A beautiful Shamrock Orbweaver, Araneus trifolium, hides in the sheltered fold of a milkweed leaf. While on a recent foray into West Virginia, I stumbled into some interesting arachnids and will share a few here. The above orbweaver had recently snared a Pipevine Swallowtail, and consumed its innards. Just the dried husk of the butterfly dangled from its web, and a gust blew it off just as I was preparing to make a photo of the kill. That meal demonstrates the bulletproof constitution of these spiders. The swallowtail is rather toxic and shunned by most predators.
This is a famous spider (well famous among spider people)!
It is Hypochilus thorelli, the lampshade weaver. The spider is famous because it is evidently from a very ancient lineage, and has a mixture of really bizarre features, primitive features and ordinary ones. They are fairly common in situations just like you suggest and we have only one species in the east, but there is a cluster of other species in the west (another one of those odd things). I've been looking for them in the parts of Ohio in the Allegheny Plateau, but no luck yet.