Hieracium aurantiacum, L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 374

48. H. aurantiacum L. , Sp. Pl. 801 (1753).

Stolons more or less numerous, above or below ground, leafy. Rosette-leaves few, pale green or rather glaucous, obtuse to acute, attenuate at base, with numerous, pale simple eglandular hairs on both surfaces and the margin. Flowering stems 20-40(-65) cm, with sparse stellate, numerous, dark simple eglandular hairs 1-6 mm, and few, shorter, dark glandular hairs above, with 1-4 leaves like those of the rosette or bract-like. Inflorescence cymose-corymbose, often with long lower branches; capitula 2-12(-25). Involucral bracts 1 - 5-3 mm wide, lanceolate, obtuse to acute, with more or less numerous stellate hairs, numerous long, dark simple eglandular hairs and fewer, shorter, dark glandular hairs. Ligules orange-brown or -red, purplish when dry. 2« = 18, 27, 36, 45, 54, 63, 72. N. & C. Europe, mainly in the mountains, extending locally southwards to S. C. France and Bulgaria; widely cultivated and naturalized elsewhere. Au Bu Cz Fe Ga Ge He It Ju No Po Rm Rs (*C, W) Su [Be Br Da Ho Is].

The natural distribution of the following two subspecies is made uncertain by the occurrence of intermediates and by the naturalization of both subspecies, particularly of subsp. (b).