Juncaceae

Chestnut rush

Juncus castaneus Sm.

Family: Juncaceae
Genus: Juncus

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Chestnut rush (Juncus castaneus) — FlowerPhoto: Ida B D Jacobsen, CC BY 4.0, from iNaturalist

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Common names

By language (9)

Arabic: أسل كستنائي
Chinese: 栗花灯心草, 栗花燈心草, 粟花灯心草, 栗花灯芯草
Czech: Sítina kaštanová
English: Chestnut rush
Finnish: Ruskovihvilä
Icelandic: Dökkasef
Norwegian Bokmål: Kastanjesiv
Swedish: Bruntåg
Welsh: Brwynen gastanliw

Synonyms

Juncus castaneus var. castaneus
Juncus castaneus var. pallidus B.Boivin

Flowers

In flower: July to August (from 13 flowering iNaturalist observations worldwide)
Flower colour: brown (USDA PLANTS Database)

Characteristics

Growth habit: Graminoid
Lifespan: Perennial
In the US and Canada: Alaska: native, Canada: native, Greenland: native, Lower 48 states: native

Photos

FlowerPhoto: Ida B D Jacobsen, CC BY 4.0, from iNaturalist
Photo: Christian Berg, CC BY 4.0, from iNaturalist
Photo: Jason Grant, CC BY 4.0, from Wikimedia Commons
Photo: Jason Grant, CC BY 4.0, from iNaturalist
Photo: Syd Cannings, CC BY 4.0, from iNaturalist
Photo: Urgamal Magsar, CC BY 4.0, from iNaturalist
Photo: Syd Cannings, CC BY 4.0, from iNaturalist
Photo: Aleksei Baushev, CC BY 4.0, from iNaturalist
Photo: Fyn Kynd, CC BY-SA 4.0, from iNaturalist
Photo: Michael D. Pirie, CC BY 4.0, from iNaturalist
Photo: John Kees, CC0, from iNaturalist
Photo: Ingvild Riska, CC BY 4.0, from iNaturalist

More in Juncus

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.