hibiscus or not?

found this plant growing beside tomatoes. leaves smelt like mint when it was smaller, but now it's beginning to look like hibiscus to me. am i right or is it just another weed?

 

Composite from the look of the flower buds, perhaps Bidens?

 

Flower buds are present, one is showing color.

 

It's not like any hibiscus I know. General shape of the leaf, but that's all.

Are the stems square? It does look mint family, and if so would have square stems. The flower bud looks nothing like a typical mint family flower though.

 

Galinsoga I believe. Post a picture taken from another angle.

 

thanks for your replies. the stem is not square. Here's a clearer photo of the flowers.

 

I entered opposite, scalloped, and ovate into a database of cultivated plants. Lantana and Salvia dominated the results. Hibiscus has a spiral leaf arrangement.

Agree it is likely Galinsoga.

 

thanks!