Halophila johnsonii Johnson’s seagrass

Halophila johnsonii Johnson's seagrass drawing.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: Drawing reprinted with permission from: Phillips, R.C. and E.G. Menez. 1998. Seagrasses. Smithsonian Institution Press. Washington D.C.



FWC Facts:
Red tides have been documented along Florida's Gulf coast since the 1840s and likely occurred earlier. Fish kills around Tampa Bay were mentioned in the logs of Spanish explorers.

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