Carex atrata

{{Short description|Species of flowering plant}}

{{Speciesbox

|image=435 Carex atrata, C. atrofusca.jpg

|image_caption=Botanical illustration, with Carex atrofusca on the left and Carex atrata on the right.

|genus=Carex

|species=atrata

|authority=L.Sp. Pl.: 976 (1753)

|synonyms_ref=

|synonyms=

• Loxanisa atrata (L.) Raf.
• Trasus atratus (L.) Gray

}}

Carex atrata, called black alpine sedge, is a widespread species of flowering plant in the genus Carex, native to Greenland,{{Cite book|url=https://www.worldcat.org/oclc/183098604|title=Grønlands flora|date=1978|publisher=P. Haase & Sons|others=Tyge Wittrock Böcher|isbn=87-559-0385-1|edition=3. reviderede udgave|location=København|oclc=183098604}} Iceland, and most of Europe, plus scattered locations across temperate Asia, including Anatolia, Siberia and the Himalaya, as far as Taiwan and Japan.{{cite web |title=Carex atrata black alpine sedge |url=https://www.rhs.org.uk/Plants/91785/i-Carex-atrata-i/Details |publisher=The Royal Horticultural Society |accessdate=4 January 2021 }}{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30009416-2 |title=Carex atrata L. |author= |date=2017 |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=4 January 2021 }} Its chromosome number is 2n=52, with some variants reported, e.g. n2=54 for Greenland material.{{cite journal |last1=Rotreklová |first1=Olga |last2=Bureš |first2=Petr |last3=Řepka |first3=Radomír |last4=Grulich |first4=Vít |last5=Šmarda |first5=Petr |last6=Hralová |first6=Ivana |last7=Zedek |first7=František |last8=Koutecký |first8=Tomáš |date=2011 |title=Chromosome numbers of Carex |url=https://www.researchgate.net/publication/265414867 |journal=Preslia |volume=83 |issue=1 |pages=25–58 |access-date=4 January 2021 }}