Helianthus porteri
Helianthus porteri is a species of sunflower known by the common names Porter's sunflower, Stone Mountain Daisy and Confederate daisy. It is native to the southeastern United States, such as Alabama and Georgia, but has been introduced to granite outcrop areas in North Carolina where it is aggressively weedy.
Helianthus porteri grows on thin soils on and around flat rock granite and gneiss outcrops. It is an annual herb up to 100 cm tall. One plant usually produces 5 or more flower heads, each containing 7 or 8 yellow ray florets surrounding 30 or more yellow disc florets.
The species is named for Thomas Conrad Porter.
