Sylvaticae; compared to C. sylvatica, it has denser female spikes, and is distinguished by its hyaline female glumes and the fact that the uppermost spike is often androgynecandrous.
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Carex rainbowii was described in 2013 by a group of Spanish botanists, having previously been considered an introduced population of Carex sylvatica.
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It had previously been misidentified as introduced populations of Carex sylvatica, but was published as a new species in 2013.
Carex | Fagus sylvatica | Carex sylvatica | Carex nigra | Carex lyngbyei | Carex leporina | Carex geyeri | Carex flacca | Carex echinata | The fungus forms ectomycorrhiza-like structures with the sedge ''Carex flacca | Carex utriculata | Carex rossii | Carex pilulifera | Carex otrubae | Carex inops | Carex emoryi | ''Carex binervis'' in its typical habitat, growing among ''Calluna |