I don't know if I planted this or if it came up on it's own. This is all I have, no flower yet.

A Ruellia possibly maybe R brittonia.

https://www.google.com/search?...

my guess would be conyza.
There's not great photos in the database, check this article:
http://healingweeds.blogspot.c...

I was thinking Ruellia as well, but the stem doesn't look quite right. It doesn't exactly look wrong, just not exact right. The leaves look pretty spot on, though.

I know nothing about conyza, but the pics I saw online look like at least the new growth is somewhat hairy. I don't see that in the plant in question.

Part of what might be giving us difficulty in identification, is the deformation of the plant in question... looks like a bit of herbicide overspray damaged the plant... is; notice the wide stem...

No herbicide stone but it now sleeps with the fishes. You know your stuff.

Kabby said:No herbicide stone but it now sleeps with the fishes. You know your stuff.

I'm not sure that any of us can completely avoid having a certain amount of damage from herbicides.
Small amounts of herbicides drift in on the wind, show up in the compost, every time we purchase "conventional" veggies.

. And... In the potting soil, in the animal manures that we get from animals that are eating hay that's not organic... A million ways that chemical nasties can get in and cause cellular damage to our plants.

Incidentally, weeds aren't bad...
Conyza doesn't bloom untill mid to late summer, plenty of time to add it to the compost pile... As I desperately need organic materials to dig into the sand, I will deliberately allow stuff to get some size on it before removal....

The plants evolved with competition, and having a few weeds confuses the bugs.... And.... What a time saver!
If I'm not weeding today, I'm not creating the conditions that require me to weed again next week!

Gaia hates a tidy garden.