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Hieracium hieronymi is a forb of genus Hieracium in the Asteraceae family. and found only in Ecuador once in a collection gathered in 1871 from Pichincha; the description included with the specimen was "Crescit prope Panecillo haud procul a praedio Hacienda Pesillo inter urben Quito et La Esperanza", and in a more recent specimen reported by L. Mille still some years ago (before the Second World War) gathered from Carchi and deposited in the Berlin Herbarium where the taxonomic problems have remained intact.
The natural habitat of Hieracium hieronymi is the subtropical or tropical moist Andean montane grasslands and shrublands between the altitudes of 1,500 m (4,921 ft) to 3,500 m (11,483 ft). It is threatened by habitat loss. It has not been found growing in the protected lands of páramo.