Fish and Wildlife Research Institute

Halophila johnsonii Johnson's seagrass photo.jpg

Halophila johnsonii Johnson’s seagrass

Kingdom: PLANTAE
Division: ANTHOPHYTA
Class: MONOCOTYLEDONEAE
Order: HELOBIAE
Family: HYDROCHARITACEAE
Genus: Halophila
Species: johnsonii

PHYSICAL DESCRIPTION

  • Halophila is the only genus of seagrasses whose leaves do not have basal sheaths
  • Leaves are long and elliptical
  • Leaf blades are 0.5- 2.5 cm long and 1- 4 mm wide with a point at the tip
  • Leaves occur in pairs
  • Petiole is 1- 2 cm long
  • The leaf margins are entire
  • Perennial
HABITAT
  • Prefers coastal lagoons
  • Grows in the intertidal zones
  • Found in sandy substrates
DISTRIBUTION
  • This species only occurs in southeastern Florida from Sebastian Inlet to Biscayne Bay


Image Credit: NOAA Coastal Services Center



FWC Facts:
Pyrodinium bahamense, an HAB organism that blooms each summer in Tampa Bay and Indian River Lagoon, chemically lights up to glow in the dark. This is called bioluminescence.

Learn More at AskFWC