Poaceae

Kuroiwa grass

Thuarea involuta (G.Forst.) R.Br. ex Sm.

Family: Poaceae
Genus: Thuarea

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Kuroiwa grass (Thuarea involuta) — FlowerPhoto: pbsg, CC BY 4.0, from iNaturalist

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Common names

By language (4)

Chinese: 砂滨草, 芻蕾草, 常宫草, 蒭雷草
English: Kuroiwa grass, Tropical beach grass
Japanese: クロイワザサ
Tongan: Kefukefu

Synonyms

Ischaemum involutum G.Forst.
Ornithocephalochloa arenicola Kurz
Panicum sarmentosum (Pers.) Raspail
Thuarea involucrata Eschsch.
Thuarea latifolia R.Br.
Thuarea media R.Br.
Thuarea sarmentosa Pers.

Flowers

In flower: March to August, November (from 23 flowering iNaturalist observations worldwide)

Characteristics

Growth habit: Graminoid
Lifespan: Perennial
In the US and Canada: Hawaii: introduced, Pacific Basin: native

Photos

FlowerPhoto: pbsg, CC BY 4.0, from iNaturalist
FlowerPhoto: Cheng-Te Hsu, CC BY 4.0, from iNaturalist
FlowerPhoto: chiuluan, CC BY 4.0, from iNaturalist
FlowerPhoto: 葉子, CC0, from iNaturalist
Photo: No machine-readable author provided. Keisotyo assumed, CC BY-SA 3.0, from Wikimedia Commons
Photo: Valerii Glazunov, CC BY 4.0, from iNaturalist
Photo: Tauʻolunga, CC BY-SA 3.0, from Wikimedia Commons
Photo: Lucas Christofides, CC BY 4.0, from iNaturalist
Photo: 葉子, CC0, from iNaturalist
Photo: 胡正恆(Jackson Hu), CC BY 4.0, from iNaturalist
Photo: 胡正恆(Jackson Hu), CC BY 4.0, from iNaturalist
Photo: 葉子, CC0, from iNaturalist

More in Thuarea

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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.