Orig. (Warén 1926): Menyanthes trifoliata-Sphagnum teres-Ass.

Syn.: Carici chordorrhizae-Sphagnetum warnstorfii Warén 1926 (§ 25), Sphagno-Caricetum lasiocarpae Steffen 1931 p. p., Sphagno warnstorfii-Caricetum lasiocarpae Steffen 1931 (fantom)

Formal definition: (Carex chordorrhiza cover > 5 % OR Carex diandra cover > 5 % OR Carex lasiocarpa cover > 5 % OR Carex limosa cover > 5 %) AND Sphagnum sp. cover > 0 % AND (Hamatocaulis vernicosus cover > 5 % OR Scorpidium revolvens s. l. cover > 5 % OR Sphagnum contortum cover > 25 % OR Sphagnum warnstorfii cover > 5 % OR group Eriophorum latifolium OR group Sphagnum warnstorfii)