Bitterweed

(picture snagged from photobucket to see that album go here)

This Bitterweed plant is a member of the Sunflower family. It grows low to the ground and has clusters of little sunflowers on the plant. Livestock don't touch this stuff when it grows in meadows because the flower is bitter to taste. If cows eat this pretty little sunflower, it'll make their milk bitter. It's funny cause they say cattle won't touch the stuff.
Bitterweed usually is a hearty plant. It can grow in any condition of weather or soil unlike it's cousin the Goliath which is pretty hard to grow. Unlike It's cousins, It has a yellow center small and round. Pedals are usually about ten, small feet like lemon pedals. They virtually bloom all spring, summer and into fall.
At my home, they are all along my driveway in between our scotch pines. They bloom along with wild chamomile and other plants. The main attraction at my mailbox alongside the highway. There are sitings of Bitterweed as far as the Texas line. They grow in numerous states that love the sunshine.
This plant is toxic to your sheep if you are farming livestock. You may want to terminate any that you may see in your fields. They will nibble along with the grass. They make pretty flower arrangements, but that's all. If your cow eats the weeds, the milk is not worth drinking. On several resources that I've read, this flower doesn't really like bees or livestock.
Some good points about bitterweed if grown under fruit trees, it'll help the fruit to ripen good. If you need a good ground cover in a sunny area of your flower garden, the bitterweed might help you out there, just don't eat the honey of the bees nearby, it'll be yucky. If you want good honey, use clover.