Plants 10-15(-25+) cm. Stems proximally piloso-hirsute (hairs 3-5+ mm), stellate-pubescent, and stipitate-glandular, distally piloso-hirsute (hairs 3-5+ mm), stellate-pubescent, and stipitate-glandular. Leaves: basal 5-13+, cauline 0(-2+); blades spatulate to elliptic or narrowly lanceolate, 20-80 × 6-20+ mm, lengths 2-8+ times widths, bases cuneate, margins usually entire, rarely dentate, apices rounded to acute, faces piloso-hirsute (hairs 1-3+ mm). Heads borne singly or 2+ in corymbiform arrays. Peduncles piloso-hirsute, stellate-pubescent, and stipitate-glandular. Calyculi: bractlets 5-8+. Involucres ± hemispheric, 13-18 mm. Phyllaries 13-21+, apices acute to acuminate, abaxial faces piloso-hirsute and stipitate-glandular. Florets 80-120+; corollas yellow, 12-15 mm. Cypselae columnar, 3.5-4 mm; pappi of 40-60+, stramineous bristles in ± 2 series, 6-7 mm. Flowering Jul(-Sep). Calcareous stream banks; 0-10+ m; Greenland; Europe. The type of Hieracium trigonophorum Oskarsson is probably conspecific with that of H. alpinum.