Sawgrass is a sedge (not a grass) with a serrated edge found in the Florida Everglades. A sedge is defined by having a triangular, not a round serration. Sawgrass can be very dangerous to those trying to navigate an area covered by this "river grass", but is an important source of food for local creatures.
Sawgrass is also a famous United States golf course in Ponte Vedra, Florida, east of Jacksonville and north of Orlando. It hosts The Player's Championship.