Information on Sea Arrowgrass

Common Name: Sea Arrowgrass
Scientific Name: Triglochin maritima
Irish Name: Barr an mhilltigh mara
Family Group: Juncaginaceae
Distribution: View Map (Courtesy of the BSBI)
Flowering Period


Click for list of all flowering by month
Sea Arrowgrass is not easily confused with other wild plants on this web site.


This is a perennial plant which grows in salt-marshes and on wet coastal shores. It has tall, long-stalked spikes of small flowers (3–4 mm across) which have three very pale green petals. The leaves are linear and fleshy, not furrowed nor veined. The flowers can be seen from May to September and the egg-shaped fruit which follows has six carpels. This is a native plant belonging to the Juncaginaceae family.

I first came across this plant at Tacumshane, County Wexford in 2008 and I photographed it at that time. 

If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre

Arrowgrass, Sea
Arrowgrass, Sea

The genus name Triglochin derives from two Greek words – treis : three and glochin : bristle perhaps referring to the centres of the little flowers.