Hieracium caesium (Fr.) Fr.

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 caesium (Fr.) Fr.

Synonym: Hieracium basifolium (Fr. ex Almq.) Lönnr.

Native status

Native. Pine and spruce forests.

Distribution

Finland: Al, Ab, N, Ka, St, Ta, Sa, Kl, Oa, Tb, Sb, Kb, Ok, Obo, Ks; Denmark ( Schou 2001), Norway, Sweden ( Samuelsson 1954, Tyler 2006 e), northern European Russia ( Schljakov 1989, Sennikov 2000, Sennikov 2008 b), Baltic countries ( Sennikov 2003 b). Reported also elsewhere, but in a different interpretation ( POWO 2025).

Notes

Sennikov (2005) interpreted the lectotype of Hieracium caesium as referable to H. basifolium , but Tyler (2006 e) preferred to exclude the name H. caesium from use.

Diagnosis

Stems 40–50 cm tall. Rosulate leaves lanceolate to broadly lanceolate, with small to prominent teeth, thick, dark glaucous-green, sometimes with purple spots, usually glabrous above, on long petioles. Cauline leaves similar, 1–3 in the basal half. Phyllaries gradually attenuated to the apex, 10–11 mm long, very dark, with sparse to dense simple hairs 1–1.5 mm long, very rare to rare glandular hairs 0.3–0.4 mm long and sparse stellate hairs throughout, apex with irregular ciliae. Synflorescence branches with solitary to rare simple hairs, very rare glandular hairs 0.2–0.3 mm long and stellate hairs. Styles with black papillae. Ligules glabrous.