Taxonomy

Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip., Flora 45:426. 1862

Common synonyms

Clappia aurantiaca (L.) Benth.; Hieracium aurantiacum L.; Hieracium aurantiacum f. aurantiacum; Hieracium aurantiacum f. normale Nägeli & Peter; Hieracium aurantiacum subsp. achnolepium Nägeli & Peter; Hieracium aurantiacum subsp. aurantiacum; Hieracium aurantiacum subsp. carpathicola Nägeli & Peter; Hieracium aurantiacum subsp. fauhinii Soest; Hieracium aurantiacum subsp. flammans Nägeli & Peter; Hieracium aurantiacum subsp. hinterhuberi (R.Hinterh.) Zahn; Hieracium aurantiacum subsp. neriedowae Wol. & Zahn; Hieracium aurantiacum subsp. porphyranthes Nägeli & Peter; Hieracium aurantiacum subsp. pseudaurantiacum Nägeli & Peter; Hieracium aurantiacum subsp. pyrrhophorum Nägeli & Peter; Hieracium aurantiacum subsp. spanochaetium Nägeli & Peter; Hieracium aurantiacum subsp. subaurantiacum Nägeli & Peter; Hieracium aurantiacum subsp. taphranthelum Zahn; Hieracium aurantiacum subsp. valdersianum Nägeli & Peter; Hieracium aurantiacum var. aurantiacum; Hieracium aurantiacum var. longifolium Nyár. & Zahn; Hieracium bihariense A.Kern.; Hieracium brunneo-croceum Pugsley; Hieracium carpathicola (Nägeli & Peter) Czerep.; Hieracium hinterhuberi R.Hinterh.; Hieracium neriedowae (Wol. & Zahn) Czerep.; Hieracium scanicum Dahlst.; Hieracium subaurantiacum (Nägeli & Peter) Czerep.; Hieracium subaurantiacum (Nägeli & Peter) Prain; Inula aurantiaca (L.) Spreng.; Pilosella aurantiaca subsp. achnolepia (Nageli & Peter) H.P.Fuchs; Pilosella aurantiaca subsp. brunneocrocea (Pugsley) P.D.Sell & C.West; Pilosella aurantiaca subsp. carpathicola (Nägeli & Peter) Soják; Pilosella aurantiaca subsp. porphyranthes (Nägeli & Peter) Soják; Pilosella aurantiaca subsp. subaurantiaca (Nägeli & Peter) Soják; Pilosella aurantiaca var. aurantiaca; Pilosella bihariensis (A.Kern.) Arv.-Touv.; Pilosella carpathicola (Nägeli & Peter) Schljakov; Pilosella carpathicola (Nägeli & Peter) Soják; Pilosella neriedowae (Wol. & Zahn) Schljakov; Pilosella subaurantiaca (Nägeli & Peter) Schljakov

Common name

Orange Hawkweed, Devil’s Paintbrush

Description

Propagule or dispersal unit is the fruit with pappus. Fertile part 1.5-2.2 mm long, 0.3-0.5 mm wide, in side view widest in upper part (obovoid), +/- straight, the upper (apical) end suddenly cut off (truncate), in cross-section round (terete) or flattened, basal scar (carpopodium) inconspicuous and undifferentiated, central or off to the side (oblique) or at least asymmetric, beak (=thinner sterile stalk between seed and pappus) absent, wings absent, fruit surface black or reddish to pink, with round protrusions or bumps, rarely smooth (except at cellular level), with no hairs (glabrous), thickened margin absent, longitudinal ribs present, 8-11, their surfaces toothed, serrated or scale-like, with no hairs (glabrous).

Pappus type bristles / hairs, pappus elements all +/- similar, up to 3.7-6 mm long, in one row, pappus elements numerous, elements falling off individually, the individual bristles rough / serrated (barbellate), +/- equal width along length, white / translucent.

Ecology

Perennial herb spreading with stolons, seeds wind-dispersed. Temperate regions. Cultivated as an ornamental. Weed of urban areas, grasslands, and roadsides; of particular concern as a potential invasive in alpine areas.