Helianthus 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.Biota of North America Program 2014 county distribution map
Description Helianthus 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.Britton, Nathaniel Lord 1901. Manual of the Flora of the northern States and Canada 993
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