Carex haydenii

{{Short description|Species of grass-like plant}}

{{distinguish|Carex haydeniana}}

{{Speciesbox

| image = Carex haydenii BB-1913.png

| image_caption = Botanical illustration

| image2 = Carex haydenii iNat-210698004.jpg

| status = LC

| status_system = IUCN3.1

| genus = Carex

| species = haydenii

| authority = Dewey

| synonyms_ref =

| synonyms = *Carex rousseaui Raymond

• Carex stricta var. decora L.H.Bailey
• Carex stricta var. haydenii (Dewey) Kük.

}}

Carex haydenii (common name, Hayden's sedge), is a species of flowering plant in the family Cyperaceae, native to eastern Canada and the north-central and northeastern United States.{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:300111-1 |title=Carex haydenii Dewey |author= |date=2017 |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=24 August 2021 }} Preferring to grow in wet, shady situations, but able to tolerate full sun, it is recommended for rain gardens.{{cite web |url=https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=279776 |title=Carex haydenii |author= |date= |website=Plant Finder |publisher=Missouri Botanical Garden |access-date=24 August 2021 }}