What is this purple weed by my pond?

Milton, WI

What is this purple weed by my pond?

Thumbnail by Randy22 Thumbnail by Randy22
Seattle, WA

Does this branch come from a relatively larger shrub or tree? The only I could think of is Cephalanthus occidentalis (buttonbush). I am not sure if the 2nd image with those flowers look like buttonbush.

Wait for others to chime in.

Cottage Grove, OR(Zone 8a)

Can you take a photo of the plant while it's still growing in the ground? Or at least fresh, like in a jar of water; hard to tell from photo if flowers were spherical or not when fresh. And how tall it grows.

One wild guess: Eclipta prostrata?

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