It's a Torilis species. Oklahoma has 3 species arvensis, japonica and nodosa. They are ntroduced from Europe and Asia. The common name is Hedge Parsley. If you like it keep it. If you garden for butterflies you can keep it for the swallowtails. The seeds are like burs and will stick to clothing.

Thank you! Hmmm. the butterfly attraction sounds nice but the seed problem may mot be worrh it. will have to think about it.

Olh, I saw it pn an invasive plant list i think I will just pull it

There are many nicer plants in the carrot family, Apiaceae that you can grow instead.

Snow Parsley, Cnidium monnieri. not native, but an ancient Chinese medicicinal plant.

Heart-leaved Golden Alexanders, Zizia aptera. native

It reseeds horribly, pull it before that happens.