I noticed a few days ago this slime on my echinacea. It's white and clear and about the consistency of snot. It reappears in the morning. The only thing I found online was that it might be a slug but that's a lot of slime for a slug.
What kind of a tree or tree limb is the echinacea under? The background in one of your pics looks like there are big, mature trees nearby. Are they dripping something? That looks like an awful lot of sticky stuff, especially if it's starting up at the flower end.