Hieracium oistophyllum Pugsl.

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 oistophyllum Pugsl.

Native status

Native. Pine and spruce forests.

Distribution

Finland: Al, Ab, N, Ka, St, Ta, Sa, Tb, Sb; British Isles ( Sell and Murrell 2006, Tyler 2014), Germany (Rügen Island) ( Gottschlich et al. 1998), Denmark ( Schou 2001), Norway, Sweden ( Samuelsson 1954, Tyler 2006 e), Baltic countries ( Sennikov 2003 b), Belarus ( Sennikov 1999 b), northern and central European Russia ( Schljakov 1989, Sennikov 2000, Sennikov 2006 c, Sennikov 2008 b) as far as Kostroma Region to the east ( Sennikov 2006 b). In Central Europe, the species is known from Germany ( Gottschlich 2024) and Poland ( POWO 2025).

Diagnosis

Stems 40–50 cm tall. Rosulate leaves lanceolate-oblong, oblong or ovate-oblong, base subrotund or truncate, with small spaced teeth, thin, pale-green, with dense to abundant simple hairs 0.8–1 mm above, on rather short petioles. Cauline leaf single, reduced in size. Phyllaries narrowly triangular, with rather acute apex, 9–10 mm long, pale grey-green, with dense to abundant white simple hairs up to 2 mm long throughout the surface, rare to sparse glandular hairs 0.3–0.5 mm long and sparse stellate hairs mostly along the margins, apex with numerous long soft ciliae. Synflorescence branches with dense simple hairs, rather dense to dense glandular hairs 0.3–0.4 (0.5) mm long and stellate hairs. Styles with black papillae. Ligules glabrous.