http://en.wikipedia.org/wiki/Lotic_system_ecology
Plants exhibit limited adaptations to fast flow and are most successful in reduced currents. More primitive plants, such asmosses and liverworts attach themselves to solid objects. This typically occurs in colder headwaters where the mostly rocky substrate offers attachment sites. Some plants are free floating at the water’s surface in dense mats like duckweed or water hyacinth. Others are rooted and may be classified as submerged or emergent. Rooted plants usually occur in areas of slackened current where fine-grained soils are found (Brown 1987).These rooted plants are flexible, with elongated leaves that offer minimal resistance to current.
Plants exhibit limited adaptations to fast flow and are most successful in reduced currents. More primitive plants, such asmosses and liverworts attach themselves to solid objects. This typically occurs in colder headwaters where the mostly rocky substrate offers attachment sites. Some plants are free floating at the water’s surface in dense mats like duckweed or water hyacinth. Others are rooted and may be classified as submerged or emergent. Rooted plants usually occur in areas of slackened current where fine-grained soils are found (Brown 1987).These rooted plants are flexible, with elongated leaves that offer minimal resistance to current.
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