Carex flava

{{Short description|Species of flowering plant}}

{{Speciesbox

| image = Carex flava - Niitvälja.jpg

| image_caption = Seedhead

| image2 = Cleaned-Illustration Carex flava.jpg

| image2_caption = Botanical illustration

| status = LC

| status_system = IUCN3.1

| genus = Carex

| species = flava

| authority = L.Sp. Pl.: 975 (1753)

| synonyms_ref =

| synonyms = {{collapsible list|

• Anithista flava (L.) Raf.
• Carex echinata Lam.
• Carex flava subsp. alpina (Kneuck.) O.Bolòs, Masalles & Vigo
• Carex flava var. barrerae O.Bolòs, Masalles & Vigo
• Carex flava var. fertilis Peck
• Carex flava var. gaspensis Fernald
• Carex flava var. graminis L.H.Bailey
• Carex flava f. graminis (L.H.Bailey) Scoggan
• Carex flava var. laxior (Kük.) Gleason
• Carex flavella V.I.Krecz.
• Carex flavofulva Beurl.
• Carex foliosa All.
• Carex laxior (Kük.) Mack.
• Carex lepidocarpa var. laxior Kük.
• Carex nevadensis subsp. alpina (Kneuck.) Podlech
• Carex patula Host
• Carex uetliaca Suter
• Carex viridis Honck.
• Proteocarpus flavus (L.) Fedde & J.Schust.
• Trasus flavus (L.) Gray

}}

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Carex flava, called hedgehog grass or large yellow sedge, is a widespread species of sedge (genus Carex, family Cyperaceae), native to the northern United States, Canada, Iceland, Europe, the Atlas Mountains in Africa, the Transcaucasus area, and parts of Siberia.{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30043428-2 |title=Carex flava L. |author= |date=2017 |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=31 December 2020}}{{cite web |title=Carex flava hedgehog grass |url=https://www.rhs.org.uk/Plants/79064/i-Carex-flava-i/Details |publisher=The Royal Horticultural Society |access-date=31 December 2020 |quote=Other common names; marsh hedgehog grass, yellow sedge, large yellow sedge}} It gives its name to the Carex flava species complex.{{cite journal |title=Cut from the same cloth: The convergent evolution of dwarf morphotypes of the Carex flava group (Cyperaceae) in Circum-Mediterranean mountains |year=2017 |last1=Jiménez-Mejías |first1=Pedro |last2=Benítez-Benítez |first2=Carmen |last3=Fernández-Mazuecos |first3=Mario |last4=Martín-Bravo |first4=Santiago |journal=PLOS ONE |volume=12 |issue=12 |pages=e0189769 |doi=10.1371/journal.pone.0189769 |pmid=29281689 |pmc=5744957 |bibcode=2017PLoSO..1289769J |doi-access=free}}