Non-aquatic plant ID?

[Cristy Keister]

This weed showed up last fall, survived the winter without dying back and is now growing fast.

I have tried a few plant ID websites, but can't find it. The USDA site is not working, unfortunately.

The base of the stem is deep red.

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[Cristy Keister]

hmm... wrong photos.

[Cristy Keister]

photos corrected.

[Cavan]

Looks like something from Euphorbiaceae. I will poke around a bit. Not so sure it's a native plant.

[Cristy Keister]

It was probably either in the bird seed mix, or was dropped by a bird.

[Cavan]

Can you repost this in a public area? I want to call in some help but will need a link that can be accessed by someone who isn't a member.

[Cristy Keister]

Ok, it's in Plant Talk now - is that public?

[Cavan]

Yes, thanks.

[Cavan]

I'm told that it's Euphorbia lathyris.
https://gobotany.newenglandwild.org/spe ... /lathyris/

[Cristy Keister]

That's not it. The leaves on this plant are opposite pairs, they are wider, and there is no flower other than what I show in the photo.