''Halophila baillonis'' is a species of aquatic plant in the family

Hydrocharitaceae Hydrocharitaceae is a flowering plant family including 16 known genera with a total of ca 135 known species (Christenhusz & Byng 2016), that including a number of species of aquatic plant, for instance the tape-grasses, the well known Canadian ...

. It is referred to by the common name clover grass. It is native to

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

, Cayman Islands, Colombia, Costa Rica,

Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of His ...

, Leeward Islands, Netherlands Antilles,

Panama Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a transcontinental country spanning the southern part of North America and the northern part of South America. It is bordered by Co ...

Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and unincorporated ...

Trinidad and Tobago Trinidad and Tobago (, ), officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean. Consisting of the main islands Trinidad and Tobago, and numerous much smaller islands, it is situated south of ...

, and

Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...

. It is listed on the

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...

as " vulnerable" due to its naturally rare occurrence and fragmented populations.

Description

This seagrass has fragile rhizomes with a single stem and a single root at each node. The shoots are erect and up to long, each with two obovate, keeled, scales in the central portion and a pseudo-whirl of four leaves at the tip. The leaf-blades are oblong to lanceolate, long by wide, with pronounced midribs and fine marginal serrations. There may be as many as 2,500 shoots per square metre.

Distribution and habitat

Clover grass is native to the Caribbean area. It is known from several sites in the

Greater Antilles The Greater Antilles ( es, Grandes Antillas or Antillas Mayores; french: Grandes Antilles; ht, Gwo Zantiy; jam, Grieta hAntiliiz) is a grouping of the larger islands in the Caribbean Sea, including Cuba, Hispaniola, Puerto Rico, Jamaica, a ...

, Colombia,

and

Belize Belize (; bzj, Bileez) is a Caribbean and Central American country on the northeastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a wate ...

, but its distribution is very patchy. It was previously known from

Guanacaste Province Guanacaste () is a province of Costa Rica located in the northwestern region of the country, along the coast of the Pacific Ocean. It is bordered by Nicaragua to the north, Alajuela Province to the east, and Puntarenas Province to the southeast. I ...

on the Pacific coast of Costa Rica, but has not been seen there since a severe storm in 1996 and is not known from elsewhere in the Pacific. It grows on sandy or muddy bottoms and its depth range is down to about . In 2015 it was found on the coast of Brazil in the state of Paraíba on a sheltered bar at the mouth of the Mamanguape River.

Ecology

Where it is plentiful, as in Belize, it is sometimes found growing among the prop roots of

mangrove A mangrove is a shrub or tree that grows in coastal saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are taxonomically diverse, as a result of convergent evolution in severa ...

s, intermingled with ''

Thalassia testudinum ''Thalassia testudinum'', commonly known as turtlegrass, is a species of marine seagrass. It forms meadows in shallow sandy or muddy locations in the Caribbean Sea and the Gulf of Mexico. Turtle grass and other seagrasses form meadows which are i ...

'', ''

Halophila decipiens ''Halophila decipiens'', commonly known as Caribbean seagrass or paddle grass, is a seagrass in the family Hydrocharitaceae. It grows underwater on sandy or muddy sea floors in shallow parts of tropical seas. Description ''Halophila'' is the onl ...

'', '' Halodule wrightii'' and ''

Caulerpa ''Caulerpa'' is a genus of seaweeds in the family Caulerpaceae (among the green algae). They are unusual because they consist of only one cell with many nuclei, making them among the biggest single cells in the world. A species in the Mediterran ...

'' spp.. It provides food for the

West Indian manatee The West Indian manatee (''Trichechus manatus''), also known as the North American manatee, is a large, aquatic mammal native to warm coastal areas of the Caribbean, from the eastern US to northern Brazil. Living alone or in herds, it feeds on un ...

and concealment for young

nurse sharks The Ginglymostomatidae are a cosmopolitan family of carpet sharks known as nurse sharks, containing four species in three genera. Common in shallow, tropical and subtropical waters, these sharks are sluggish and docile bottom-dwellers.

. The scorched mussel lives in the

seagrass meadow A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and ...

s and fish such as the flag-fin mojarra and the permit feed on the mussels and consume the seagrass while doing so.

Status

This is a rare species of sea grass with a very fragmented distribution. Its greatest abundance is in the Placencia Lagoon in Belize, where it grows in dense monospecific stands. In several places, such as in Colombia and Puerto Rico, its presence has been confirmed in the past but it has not been found recently. Its total population seems to be in decline; its total area of occupancy is about and it is known from about seven locations. For these reasons, the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of nat ...

has assessed its conservation status as being " vulnerable".

References

{{Taxonbar, from=Q15555424 baillonis Flora of the Caribbean Taxa named by Paul Friedrich August Ascherson Flora of Brazil Flora of the Cayman Islands Flora of Colombia Flora of Costa Rica Flora of the Dutch Caribbean Flora of Jamaica Flora of the Leeward Islands Flora of the Netherlands Antilles Flora of Panama Flora of Puerto Rico Flora of Trinidad and Tobago Flora of Venezuela Taxobox binomials not recognized by IUCN