Hieracium aurantiacum is a perennial herb, 10-60 cm tall, sap milky, stems from rhizomes, aggressively colonial from spreading basal stems (stolons), most parts long-hairy, hairs gland-tipped on upper stem.
Leaves mostly in a basal rosette, 5-25 cm long, including stalk, 1-3.5 cm wide, narrow, widest above middle, tip blunt, base narrowing gradually to winged stalk, both sides long-hairy, green, margin entire, leaves of stolons smaller, stem leaves 1, (occasionally 2 or none), much smaller, sessile.
Flowers red-orange, about 2 cm wide, all rays, basal bracts of head (involucre) with long blackish, gland-tipped hairs, self-fertile (agamospermy), (Mulligan and Kevan 1973); inflorescence of small, branched clusters at top of stem; blooms June-Aug.
Fruit dry, 1-seeded achenes with whitish plume; wind dispersed.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Open areas, roadsides, lawns.