Pondweed Family

plant drying after being out of water for 1/2 hour

I had no field images of this taxon, bit I had made a collection (2006). With both floating and submerged leaves (how does one tell in an Herbarium specime?), and with narrow submerged leaves, and these leaves having a net-like band along midrib, it was a shoe in for P. epihydrus.