Some "flowers" are not native to the United States. A number of "flowers" were brought in from Eurasia because they were pretty. However, they adapted too well and soon became invasive, spreading from gardens to lawns to neighboring properties and into range land, national forests as well as wilderness areas. These non-natives soon crowded out - and overran - native vegetation in their path, often creating a monoculture. Chamomile and oxeye daisy are considered in many states, including Colorado, to be noxious weeds or invasive species. Fields of such pretty "flowers" are not edible to wildlife and livestock, often loosing out on valuable grazing lands. The daisy shown on the right in the picture with the article was the Shasta daisy which is native and good, the other two were Chamomile and Oxeye which are both noxious/ invasive "weeds."