| pilosella | (n) genus of hairy perennial herbs with horizontal rhizomes and leafy or underground stolons; Eurasia and North Africa; often considered congeneric with Hieracium, Syn. genus Pilosella |
| 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 |