| hieracium | (n) large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with Pilosella, Syn. genus Hieracium |
| king devil | (n) European hawkweed introduced into northeastern United States; locally troublesome weeds, Syn. Hieracium praealtum, yellow hawkweed |
| mouse-ear hawkweed | (n) European hawkweed having soft hairy leaves; sometimes placed in genus Hieracium, Syn. Hieracium pilocella, Pilosella officinarum |
| orange hawkweed | (n) 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, Syn. Hieracium aurantiacum, Pilosella aurantiaca |
| rattlesnake weed | (n) a hawkweed with a rosette of purple-veined basal leaves; Canada to northern Georgia and Kentucky, Syn. Hieracium venosum |