Triglochin is a plant genus in the family Juncaginaceae described by Carl Linnaeus in 1753.

[1][7] The most widely used common name for the genus is arrowgrass,[8] although these plants are not really grasses.

Arrowgrasses are used as food plants by the larvae of some Lepidoptera species including the grey chi moth.

This genus contains marsh herbs with flat or cylindrical leaves.

[9] The fruits have 3-6 free or fused curved follicles or achenes (small, dry, one seeded fruits with a loose covering)that break away from a persistent three winged axis.