Water Stargrass, Herteranthera dubia (Jacq.) MacMill

Other Names: Grassleaf Mudplantain, Water star-grass

Synonym: Zosterella dubia (Jacq.) Small

Plant Family: Water-Hyacinth, Pontederiacea

Wetland Indicator Status: OBL

Water Star-Grass, Heteranthera dubia

The small, yellow, star-shaped flower of Water Stargrass, (Herteranthera dubia).

Water Star-Grass (Heteranthera dubiaresembles) many of the narrow-leaf pondweed species, but has no midrib on its narrow leaves.  The plant has small, yellow flowers with thin petals that resemble stars.

Water star-grass has the seemly strange trait of many aquatic plants:  they often don’t successfully reproduce unless they are on exposed lake bed.  While I do occasionally see the small yellow flowers of water stargrass in very shallow, plant-choked water, I more often encounter them coming out of the mud or sand where the lakeshore has receded slightly.

I prefer the old genus name Zosterella, because there is a pondweed (Potamogeton) called Potamogeton zosteriformis.  At first glance from the boat or the dock the plant looks just like water stargrass, but has that tell-tale midrib on the leaf.  Botanists recognized the similarity, giving it the species name zosteriformis (in the form of zoster) so now the name makes little sense. (Thanks, plant taxonomists.)