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orange hawkweed, Pilosella aurantiaca, Hieracium aurantiacum | European hawkweed having flower heads with bright orange-red rays; a troublesome weed especially as naturalized in northeastern North America; European hawkweed having flower heads with bright orange-red rays; a troublesome weed especially as naturalized in northeastern North America; sometimes placed in genus Hieracium ❲Pilosella aurantiaca, Hieracium aurantiacum❳ |