Juncus validus

{{Short description|Species of plant in the genus Juncus}}

{{Speciesbox

|image=Aquatic and wetland plants of southwestern United States (Page 642) BHL3347106.jpg

|image_caption=Botanical illustration

|genus=Juncus

|species=validus

|authority=Coville

|synonyms_ref=

|synonyms=

• Juncus crassifolius Buchenau
• Juncus scirpoides subvar. major Engelm.

}}

Juncus validus, the roundhead rush, is a species of flowering plant in the family Juncaceae, native to the central and southeastern United States.{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:132364-2 |title=Juncus validus Coville |author= |date=2017 |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=3 July 2021 }}{{cite web |url=https://plants.sc.egov.usda.gov/home/plantProfile?symbol=JUVA2 |title=Juncus validus Coville roundhead rush |author= |website=USDA Plants Database |publisher=United States Department of Agriculture, Natural Resources Conservation Service |access-date=3 July 2021 }} It is a somewhat weedy species, found along wet roadsides and in ditches.{{cite journal |title=Juncus fascinatus (Juncaceae), a new combination in Juncus sect. Ozophyllum and notes on morphologically similar species |year=2014 |last1=Knapp |first1=Wesley Martin |journal=Phytotaxa |volume=174 |issue=5 |page=243 |doi=10.11646/phytotaxa.174.5.1 |quote=Key to ... similar species of Juncus |doi-access=free }}