Helenium autumnale / Sneezeweed

Many of our yellow-flowered perennials, such as coreopsis and goldenrod, are best suited for sunny, dry sites. Sneezeweed, on the other hand, prefers more moisture and even tolerates having wet feet. If you need a pop of yellow for a sunny, moist garden, sneezeweed will happily contribute its unique, yellow flowers that bloom in early fall.

For more info see below:

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c930