Helianthus ambiguusHelianthus ambiguus is a North American species of sunflower known by the common name ambiguous sunflower. It is found only in the Great Lakes region of the United States, the states of New York, Michigan, Ohio, and Wisconsin.DescriptionHelianthus ambiguus is an herb up to tall. Leaves are long and narrow, lance-shaped, up to long. One plant produces a few flower heads, each across.