I took a similar photo of a bird at Marble Spung back in Sept 2019. I ID'd as a Solitary Sandpiper. They may just look slightly different, but the other species didn't have the same look. What goes; I have five bird guide books , but only one for trees.I got in my car ready to leave, and this fellow came into the puddle. I let him bathe about 5 minutes. Could not get a good shot.
Uh-oh. I saw several of these next to spungs in an otherwise 100% natural pineland habitat. I'm worried that they may be invasive. I have an idea of what it is, but I'd like to see if anyone else recognizes it.
View attachment 23193
Yes, that's what I'm thinking too: Polygonum cuspidatum. The name has been changed, but I still use this one due to the task.I was thinking maybe some kind of knotweed, which is an aggressive invasive species, but I'm not sure it matches up with your photo.