(Hartm.) Hämet-Ahti, Ann. Bot. Fenn. 17: 342 (1980)
Plants 5–20 cm tall. Rhizome creeping, with internodes 1–10 mm long. Inflorescence narrow in outline; main branches erect; heads 1–5 (–7), 2–5 (–7) mm wide, each with (3–) 4–9 dark brown to castaneous-coloured flowers; outermost flowers of heads erect, long-pedicellate; separate flowers few to absent with pedicels to 2 mm long. Tepals ±equal 2.0–3.0 mm long, all broadly obtuse; outer tepals often mucronate. Capsule ellipsoid-ovoid, (2.5–) 3.0–3.5 mm long, ±exceeding perianth, obtuse to ±subacute, shortly mucronate, very dark castaneous to blackish, shiny.