Hieracium pilosella, 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 : 368

10. H. pilosella L. , Sp. Pl. 800 (1753).

Stolons usually numerous, long, slender, leafy, occasionally with a terminal capitulum. Rosette-leaves 10-120 x 5-20 mm, oblanceolate, spathulate or elliptical, obtuse or acute, with few to numerous, long, pale simple eglandular hairs on both surfaces and the margin, and dense stellate hairs beneath and sometimes also above. Scapes 5-30(-50) cm, each with a single capitulum, with dense stellate hairs and simple eglandular and glandular hairs in various proportions. Involucral bracts (6—)8—12(—15) x 0-5~l-5(-2) mm, linear-lanceolate, acute, with variable indumentum. Ligules yellow, usually with a red stripe on outer face. 2/7= 18, 36,45, 54, 63. Grassy places. Most ofEurope. All except Az Cr Fa Is Sb Tu.

1 Involucral bracts with numerous glandular and stellate hairs,

without simple eglandular hairs 2 Glandular hairs of involucral bracts not more than 0-5 mm,

± equal in length (a) subsp. micradenium 2 Glandular hairs of involucral bracts up to 1 mm, very unequal

in length (b) subsp. euronotum 1 Involucral bracts with stellate and simple eglandular hairs and

sometimes also glandular hairs 3 Leaves with dense stellate hairs on both surfaces

(h) subsp. velutinum 3 Leaves with dense stellate hairs only beneath 4 Involucral bracts with obvious simple eglandular and glandu­

lar hairs 5 Hairs of involucral bracts pale (c) subsp. pilosella 5 Hairs of involucral bracts dark (d) subsp. trichosoma 4Involucral bracts with dense simple eglandular hairs; glandu­

lar hairs absent or inconspicuous 6 Hairs of involucral bracts pale (e) subsp. tricholepium 6 Hairs of involucral bracts dark 7 Involucral bracts and upper part of scape with moderately

dense dark hairs not more than 2 mm (f) subsp. melanops 7 Involucral bracts and upper part of scape with dense dark

hairs up to 5 mm (g) subsp. trichoscapum