Halophila is a genus of seagrass

Seagrass

Seagrasses are flowering plants from one of four plant families , all in the order Alismatales , which grow in marine, fully saline environments.-Ecology:...

es in the family Hydrocharitaceae

Hydrocharitaceae

Hydrocharitaceae is a flowering plant family that includes a number of species of aquatic plant, broadly called the Tape-grasses, and includes the well known Canadian Waterweed and Frog's Bit.The family includes both fresh and marine aquatics...

, the tape-grasses. The number of its contained species, and its own placement in the order Alismatales

Alismatales

Alismatales is an order of flowering plants including about 2500 species. Pleants assigned to this order are mostly tropical or aquatic.-Description:...

, has been subject to revision by botanical authors.

It is widespread in tropical waters, the distribution range also extends to subtropical and temperate waters.
The genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 was first described by Louis-Marie Aubert du Petit-Thouars

Louis-Marie Aubert du Petit-Thouars

Louis-Marie Aubert du Petit-Thouars was an eminent French botanist.-Introduction:He was from an aristocrat family of the region of Anjou, where he grew up in the castle of Boumois, near Saumur...

 in 1802.

Species

• Halophila australis
• Halophila baillonis
• Halophila decipiens
• Halophila engelmannii
• Halophila hawaiiana
• Halophila johnsonii
  Halophila johnsonii
  Johnson's Seagrass is a small, asexual seagrass in the family Hydrocharitaceae . It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species...
  
  
• Halophila minor
• Halophila ovalis
  Halophila ovalis
  Halophila ovalis is a seagrass in the family Hydrocharitaceae, a common name is paddle weed. It is a small herbaceous plant that occurs in sea beds and other saltwater environments....
  
  
• Halophila spinulosa
• Halophila stipulacea
• Halophila tricostata