It is similar to
marsh arrowgrass (
Triglochin palustris) but has the following differences: it has
stolons, is stouter. The fruits are oval, 4 mm long, 2 mm wide. It varies in height from . It flowers in May to August; flowers are greenish, 3 petalled, edged with purple, across, in a long spike. Common names include
seaside arrowgrass,
common arrowgrass,
sea arrowgrass and
shore arrowgrass. It can be an
annual or
perennial.
Triglochin concinna is a synonym of this species. This plant is believed to be toxic, as it can produce
cyanide. However, this is usually when the plant is distressed in drought conditions or due to over harvesting, usually by grazing animals. There is a common belief that this species has been known to cause losses in cattle, with green leaves being more toxic than dried material, yet sheep and deer graze on the plant, especially in rural seaside areas. It could be that belief in the plants' toxicity is apocryphal and based on anecdotal evidence. ==References==