1. Forma Carex rigida f. aggregata Almq. accepted as Carex dacica Heuff.
2. Forma Carex rigida f. aggregata Almq. accepted as Carex dacica Heuff.
3. Forma Carex rigida f. androgyna Norm. accepted as Carex dacica Heuff.
4. Forma Carex rigida f. anguillata (Drejer) Kük. accepted as Carex dacica Heuff.
5. Forma Carex rigida f. cuspidata (Rosenv.) Kük. accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
6. Forma Carex rigida f. drejeriana (Lange) Kük. accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
7. Forma Carex rigida f. glacialis Fr. accepted as Carex dacica Heuff.
8. Forma Carex rigida f. infuscata (Drejer) Kük. accepted as Carex dacica Heuff.
9. Forma Carex rigida f. juncelliformis Almq. accepted as Carex dacica Heuff.
10. Forma Carex rigida f. latifolia (Andersson) Kük. accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
11. Forma Carex rigida f. lutosa (Drejer) Kük. accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
12. Forma Carex rigida f. paradoxa (Drejer) Kük. accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
13. Forma Carex rigida f. pudica (Drejer) Kük. accepted as Carex dacica Heuff.
14. Subspecies Carex rigida subsp. altaica Gorodkov accepted as Carex altaica (Gorodkov) V.I.Krecz.
15. Subspecies Carex rigida subsp. decolorans (Wimm.) K.Richt. accepted as Carex decolorans Wimm. represented as Carex ×decolorans Wimm.
16. Subspecies Carex rigida subsp. ensifolia Turcz. ex Gorodkov accepted as Carex bigelowii subsp. ensifolia (Turcz. ex Gorodkov) Holub
17. Subspecies Carex rigida subsp. hesperia Piper accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
18. Subspecies Carex rigida subsp. inferalpina (Laest.) Gorodkov accepted as Carex dacica Heuff.
19. Subspecies Carex rigida subsp. intricata (Tineo ex Guss.) Nyman accepted as Carex nigra subsp. intricata (Tineo ex Guss.) Rivas Mart.
20. Subspecies Carex rigida subsp. kamtschatica Gorodkov accepted as Carex bigelowii subsp. bigelowii Torr. ex Schwein.
21. Subspecies Carex rigida subsp. limula (Fr.) K.Richt. accepted as Carex limula Fr. represented as Carex ×limula Fr.
22. Subspecies Carex rigida subsp. rigidioides Gorodkov accepted as Carex rigidioides (Gorodkov) V.I.Krecz.
23. Variety Carex rigida var. bigelowii (Torr. ex Schwein.) Tuck. accepted as Carex bigelowii Torr. ex Schwein.
24. Variety Carex rigida var. bracteosa (L.H.Bailey) L.H.Bailey accepted as Carex scopulorum var. bracteosa (L.H.Bailey) F.J.Herm.
25. Variety Carex rigida var. concolor (R.Br.) Kük. accepted as Carex aquatilis var. minor Boott
26. Variety Carex rigida var. dacica (Heuff.) Kük. accepted as Carex dacica Heuff.
27. Variety Carex rigida var. frigida Fr. accepted as Carex dacica Heuff.
28. Variety Carex rigida var. frigida Fr. accepted as Carex dacica Heuff.
29. Variety Carex rigida var. glacialis Fr. accepted as Carex dacica Heuff.
30. Variety Carex rigida var. glacialis (Fr.) Andersson accepted as Carex dacica Heuff.
31. Variety Carex rigida var. goodenovii (J.Gay) L.H.Bailey accepted as Carex nigra subsp. nigra
32. Variety Carex rigida var. inferalpina Laest. accepted as Carex dacica Heuff.
33. Variety Carex rigida var. intricata (Tineo ex Guss.) Briq. accepted as Carex nigra subsp. intricata (Tineo ex Guss.) Rivas Mart.
34. Variety Carex rigida var. juncea (Fr.) L.H.Bailey accepted as Carex nigra subsp. juncea (Fr.) Soó
35. Variety Carex rigida var. recurva Gray accepted as Carex dacica Heuff.
36. Variety Carex rigida var. ripensis (Laest.) Almq. accepted as Carex limula Fr. represented as Carex ×limula Fr.
37. Variety Carex rigida var. saxatilis Fr. accepted as Carex dacica Heuff.
38. Variety Carex rigida var. strictiformis L.H.Bailey accepted as Carex nigra subsp. nigra
39. Variety Carex rigida var. subconcoloroides (Kelso) Kelso accepted as Carex scopulorum var. scopulorum Holm
40. Subspecies Carex rigida subsp. bigelowii (Torr. ex Schwein.) Steffen (uncertain > unassessed)
41. Variety Carex rigida var. macedonica Bornm. (uncertain > unassessed)
42. Variety Carex rigida var. stricitiformis L.H.Bailey (uncertain > unassessed)

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