Bill, do you have any pictures? Would they look like any of these? The species name is Helianthus, and I suspect you mean Helianthus annuus.
There are many cultivar names, with some of the flowers being more yellow in color, while some are more orange. You might find this helpful.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.