Definition that contains genus hieracium
- orange hawkweed 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
- hieracium aurantiacum 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 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
- hieracium pilocella European hawkweed having soft hairy leaves; sometimes placed in genus Hieracium
- pilosella officinarum European hawkweed having soft hairy leaves; sometimes placed in genus Hieracium
- mouse-ear hawkweed European hawkweed having soft hairy leaves; sometimes placed in genus Hieracium
- hawkweed any of numerous often hairy plants of the genus Hieracium having yellow or orange flowers that resemble the dandelion