Heteranthera gramineaHeteranthera liebmanniiZosterella dubiaZosterella longituba Heteranthera dubia, commonly called water stargrass or grassleaf mudplantain, is a species of aquatic plant in the pickerel-weed family (Pontederiaceae).

It is native to North and Central America where it is widespread from Canada to Guatemala.

Submersed individuals also have a different stem and leaf morphology from those that occur partially or completely out of the water.

Its inflorescence bears a single short-lived flower that blooms in the morning and wilts in the evening.

[citation needed] The plant sometimes has galls in its tissue, which are caused by the parasitic fungus Membranosorus heterantherae.