Not all the life drawn to boneset is looking for nectar. Nature being what it is, it's only natural that a few predators would show up, lurking just under the blossoms, or building miniature webs. Some are better disguised than others. (It may take awhile for you to find the spider in the first photo.)
Most seem content to sit still, even if a potential prey comes nearby. Maybe they already had a meal before I happened along. Collectively, they extend the food chain at this backyard oasis to three (plant nectar -- pollinator -- spider).
Seven kinds of spiders or spider-like creatures raises the total count to 39.
The creature in this last photo is who knows what, but doesn't appear to be an insect.