A family of aquatic flowering plants that live in springs and streams, commonly called river weeds or water mosses.
Scientific Latin classification name formed from 'fontinal' (of springs) plus the suffix '-aceae,' which is the standard botanical ending for plant families. Indicates plants whose defining characteristic is living in spring habitats.
Fontinalaceae plants are so specialized for life in cold spring water that they're used as indicator species—if they disappear from a stream, it signals water pollution or temperature changes that scientists can detect.
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