From the pictures it has already seeded, Also this plant needs to be hand pulled several times to rid the tap root of it energy to regrow. You can kill it with weed control but when this plant is in its mature stage it harder to kill plus the seeds will drop and still be hardy.
Just my experience.
wow, seeds already, I just noticed the growth about 3 days ago, pulled a few, however after the goat head fiasco I think I'll try other methods, no fire, no Round Up, may just try a type of weed be gone and keep treating new growth
just ordered some Ortho Weed &Clear, and will feed the lawn right after using that