Carex sect. Athrochlaenae (Holm) Mack. accepted as Carex sect. Dornera Heuff. accepted as Carex sect. PaucifloraClade (new combination reference)
Carex sect. Cryptocarpae (Tuck. ex L.H.Bailey) Mack. accepted as Carex sect. Phacocystis Dumort. (new combination reference)
Carex sect. Debiles (J.Carey) Mack. accepted as Carex sect. CastaneaClade (new combination reference)
Carex sect. Deweyanae (Tuck. ex Mack.) Mack. (new combination reference)
Carex sect. Filifoliae (Tuck.) Mack. (new combination reference)
Carex sect. Firmiculmes (Kük.) Mack. (new combination reference)
Carex sect. Muehlenbergianae (J.Carey) Mack. accepted as Carex sect. AnnectensClade (new combination reference)
Carex sect. Polytrichoideae (Tuck.) Mack. accepted as Carex sect. Leptocephalae L.H.Bailey (new combination reference)
Carex sect. Triquetrae J.Carey ex Mack. accepted as Carex sect. Triquetrellae Jim.Mejías, Naczi & Reznicek (original description)