freshwater plant
1.A freshwater plant(Pontederia cordata) of eastern North America, having heart-shaped leaves with long petioles and spikes of violet-blue flowers.
2.According to the study of biomarker of the northern Ordos basin, the hydrocarbon resource rocks cane from mixed-source of organics of the input of altitude plant and plankton, and they were fanned in freshwater-tiny salt, deep lake and reductive surroundings.
