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Halophila johnsonii
Also called Species code: Hj
Johnson's seagrass is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It has been called Halophila johnsonii, but is now considered to be a clone of the widespread species Halophila ovalis. As of March 2024, Plants of the World Online treats Halophila johnsonii as a synonym of Halophila ovalis subsp. ovalis. Johnson's seagrass occurs only on the southeastern coast of Florida, in lagoons along roughly 200 km of the Florida coastline between Sebastian Inlet and the northern part of Biscayne Bay, where it grows in small patches of a few centimeters to a few meters in diameter at depths ranging from the intertidal zone down to 3 meters. It was the first marine plant listed on the United States endangered species list, though it was removed from the listing in April 2022.
Species Code: Ha · Florida Keys seagrass · Caribbean seagrass · Engelmann's seagrass · Seagrass · Species code: Hs · Seagrass
Text excerpted from the Wikipedia article Johnson's seagrass by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
