What adaptations would a plant living in a river need that a plant living in a pond would not need?

A pond is a standing water and a river is a flowing water.

Current in rivers greatly affect biodiversity. So, plants living in a river must have good adaptations for living in such specific conditions. They must have good and deep root to hold them in place against a river current. Some plants have stems that can easily bend with the river current. Moss, for example, are able to cling to stones.