Callitriche heterophylla Pursh var. heterophylla
greater water starwort, two-headed water starwort, variable water starwort
greater water starwort, two-headed water starwort, variable water starwort
May 7,
Tidmarsh Farms, Plymouth
An old stamen and ripening fruit. Fruit (schizocarp) unwinged, its surface pitted with areolae at random (prominently winged fruit in C. stagnalis; areolae in lines in C. palustris).