Hieracium caesiiflorum Almq. ex Norrl.

Sennikov, Alexander, 2025, The collection-based inventory and spatial analysis of Hieracium s. str. (Asteraceae) in Finland, Biodiversity Data Journal 13, pp. e 154676-e 154676 : e154676-

Hieracium caesiiflorum Almq. ex Norrl.

Native status

Native. Sparse pine forests, forest margins, tundra.

Distribution

Finland: Al, Ab, N, Ka, St, Ta, Sa, Kl, Oa, Tb, Sb, Kb, Om, Ok, Obu, Ks, Lkk, Le, Li; Norway, Sweden ( Samuelsson 1954, Tyler 2006 e), northern European Russia ( Schljakov 1989, Sennikov 2000, Sennikov 2008 b). Reported also as broadly distributed in Central Europe ( POWO 2025).

Notes

Hackman and Sennikov (1998) treated Hieracium caesiiflorum as a synonym of H. subcaesium (Fr.) Lindeb. , but the latter species name has not been nomenclaturally assessed and its true identity has not been established.

Diagnosis

Stems 25–50 cm tall. Rosulate leaves ovate or elliptic-ovate, base sagittate or truncate, apex broadly triangular, with prominent large teeth, rather thick, glaucous-green, usually glabrous above, on long petioles. Cauline leaves similar, single at the stem base. Phyllaries with a broadly acute apex, 9–10 mm long, pale, with sparse to rather dense whitish simple hairs 0.5–0.8 mm long, very rare glandular hairs 0.1–0.3 mm long and abundant stellate hairs throughout, apex without ciliae. Synflorescence branches with sparse simple hairs, solitary glandular hairs 0.2–0.3 mm long and stellate hairs. Styles with dark papillae. Ligules glabrous.