Cutleaf evening-primrose flower may only last part of the day, withering as the sun grows stronger. But the plants are tough guys. They grow in poor soils, often in sand, and have taken full advantage of human disturbance (the physical variety!). They are an early arrival on cleared land, or areas where the earth has been disturbed. Sometimes you will see unbranched plants only a few inches tall, with flowers half as wide as normal. But they get the job done. They get bigger as nutrition improves, eventually giving way when other larger speciess take advantage of their hospitality. The out-of-focus leaf at the far edge here shows why this is a 'cutleaf' evening-primrose. This image was shadowed by the photographer, in contrast to the full sun image on the wildflower page.