Halophila

Last updated

Tape-grasses
H. engelmannii picture.jpg
Halophila engelmannii – Star Grass. Picture taken in Florida's Gulf Coast.
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Phylum: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
Family: Hydrocharitaceae
Subfamily: Hydrilloideae
Genus: Halophila
Thouars
Synonyms [1]
  • BarkaniaEhrenb.
  • LemnopsisZipp. ex Zoll.

Halophila is a genus of seagrasses in the family Hydrocharitaceae , the tape-grasses. It was described as a genus in 1806. [2] The number of its contained species, and its own placement in the order Alismatales, has evolved.

Contents

Description

These oceanic herbs grow underwater and have creeping stoloniferous stems and leafy nodes. [3] Unlike other seagrasses, the leaves of some species of Halophila do not have basal sheaths (i.e. the bases of the leaves do not wrap around the stem to form a sheath). [4]

The flowers are unisexual. The male flowers are borne on stems. The parts occur in multiples of three along a single row. [3]

The female flowers do not have stalks. They are divided into three segments. The single chambered ovary has a long beak. The three style are long and simple. The ovules are attached on top of three placentas. [3]

The fruit is included in the bract surrounding the inflorescence (the spathe) and crowned by a beak. They have many seeds and thick embryos. [3]

Distribution

This genus is widespread in tropical waters, the distribution range also extends to subtropical and temperate waters primarily the Indian and Pacific Oceans but also the Mediterranean and Caribbean Seas and the Gulf of Mexico. [1] It is found growing off the coasts of Africa, India, Australia and the Pacific Islands. [3]

Naming

The Latin specific epithet halophila refers to salt loving. [5]

Species

Species accepted by the Kew Botanical Garden. [1]

  1. Halophila australis - southern Australia
  2. Halophila baillonii - Caribbean, North and South America
  3. Halophila beccarii - South + East + Southeast Asia
  4. Halophila capricorni - New Caledonia, islands in Coral Sea
  5. Halophila decipiens - shores of Indian Ocean and Pacific Ocean; Caribbean, Gulf of Mexico
  6. Halophila engelmannii - Mexico, Costa Rica, Bahamas, Cayman Islands, Cuba, United States (PR, FL, LA, TX)
  7. Halophila gaudichaudii - Indian Ocean, western Pacific
  8. Halophila hawaiiana - Hawaii
  9. Halophila major - Japan, Taiwan, Southeast Asia, Caroline Is, Sri Lanka
  10. Halophila mikii - Japan
  11. Halophila minor - Indian Ocean, western Pacific
  12. Halophila nipponica (syn. Halophila japonica)- Korea, Japan
  13. Halophila okinawensis - Nansei-shoto
  14. Halophila ovalis - Red Sea, Indian Ocean, western Pacific
  15. Halophila spinulosa - Southeast Asia, North Australia, New Guinea
  16. Halophila stipulacea - Red Sea, Indian Ocean, invasive in the Caribbean
  17. Halophila sulawesii - Sulawesi
  18. Halophila tricostata - Queensland

Related Research Articles

<span class="mw-page-title-main">Caribbean Sea</span> Sea of the Atlantic Ocean bounded by North, Central and South America

The Caribbean Sea is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles starting with Cuba, to the east by the Lesser Antilles, and to the south by the northern coast of South America. The Gulf of Mexico lies to the northwest.

<span class="mw-page-title-main">Restionaceae</span> Family of flowering plants

The Restionaceae, also called restiads and restios, are a family of flowering plants native to the Southern Hemisphere; they vary from a few centimeters to 3 meters in height. Following the APG IV (2016): the family now includes the former families Anarthriaceae, Centrolepidaceae and Lyginiaceae, and as such includes 51 genera with 572 known species. Based on evidence from fossil pollen, the Restionaceae likely originated more than 65 million years ago during the Late Cretaceous period, when the southern continents were still part of Gondwana.

<i>Zostera</i> Genus of aquatic plants

Zostera is a small genus of widely distributed seagrasses, commonly called marine eelgrass, or simply seagrass or eelgrass, and also known as seaweed by some fishermen and recreational boaters including yachtsmen. The genus Zostera contains 15 species.

<i>Najas</i> Genus of aquatic plants

Najas, the water-nymphs or naiads, is a genus of aquatic plants. It is cosmopolitan in distribution, first described for modern science by Linnaeus in 1753. Until 1997, it was rarely placed in the Hydrocharitaceae, and was often taken as constituting the family Najadaceae.

<span class="mw-page-title-main">Cymodoceaceae</span> Family of aquatic plants

Cymodoceaceae is a family of flowering plants, sometimes known as the "manatee-grass family", which includes only marine species.

<i>Halophila johnsonii</i> Species of aquatic plant

Halophila johnsonii, or 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, though it was removed from listing in April 2022. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed.

<i>Syringodium</i> Genus of aquatic plants

Syringodium is a genus in the family Cymodoceaceae described as a genus in 1860. It is found along shorelines of tropical and subtropical marine environments.

<i>Halodule</i> Genus of aquatic plants

Halodule is a genus of plants in the family Cymodoceaceae described as a genus in 1841. It is widespread on tropical and semi-tropical ocean shores of all continents except Europe and Antarctica.

The Seagrasses of Western Australia are submerged flowering plants found along the coast, around islands, and in Estuaries of Western Australia. The region contains some of the largest seagrass meadows in the world, and is the most diverse in the number of species. The variety of habitats along its western and southern coasts is often soft sands in shallow subtropical waters, ideal for these plants.

<i>Enhalus</i> Genus of aquatic plants

Enhalus is a monotypic genus of marine flowering plants. The sole species is Enhalus acoroides. Enhalus is a large seagrass native to coastal waters of the tropical Indian and Western Pacific Oceans. It is the only species of seagrass that does aerial surface pollination in which the pollen and the styles remain dry. Enhalus is surface pollinated with male flowers that detach from the plant to float on the surface until they reach a female flower where pollination can occur. Enhalus acoroides is considered a slow-growing, "climax" species.

<i>Thalassia testudinum</i> Species of aquatic plant

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 important habitats and feeding grounds. The grass is eaten by turtles and herbivorous fish, supports many epiphytes, and provides habitat for juvenile fish and many invertebrate taxa.

<i>Halophila engelmannii</i> Species of plant in the family Hydrocharitaceae

Halophila engelmannii is a species of seagrass in the Hydrocharitaceae family. It is referred to by the common names star grass and Engelmann's seagrass and grows underwater on shallow sandy or muddy sea floors. It is native to the Bahamas, the Cayman Islands, Costa Rica, Cuba, the Gulf Coast of the United States, the Gulf Coast of Mexico, Puerto Rico, and Trinidad and Tobago.

Elysia serca, the seagrass elysia or Caribbean seagrass elysia, is a species of sea slug, a marine gastropod mollusc in the family Plakobranchidae. Although this sea slug resembles a nudibranch, it is not a nudibranch; it belongs to the clade, Sacoglossa, the "sap-sucking" sea slugs. It was first described by Marcus in 1955 from specimens found in Brazil.

<i>Halophila decipiens</i> Species of aquatic plant

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.

<i>Halodule wrightii</i> Species of plant in the family Cymodoceaceae

Halodule wrightii is an aquatic plant in the Cymodoceaceae family. It is referred to by the common names shoal grass or shoalweed, and is a plant species native to seacoasts of some of the warmer oceans of the world.

<i>Halodule uninervis</i> Species of plant in the family Cymodoceaceae

Halodule uninervis is a species of seagrass in the family Cymodoceaceae. It is native to the western Pacific and Indian Oceans. Common names include narrowleaf seagrass in English and a'shab bahriya in Arabic.

<i>Zostera muelleri</i> Species of plant in the family Zosteraceae

Zostera muelleri is a southern hemisphere temperate species of seagrass native to the seacoasts of South Australia, Victoria and Tasmania. and New Zealand. Today, Zostera muelleri can be found in regions of Australia, New Zealand, and Papua New Guinea, as well as areas of the eastern Indian Ocean, and the southwest and western central Pacific Ocean. Zostera muelleri is a marine angiosperm, and is commonly referred to as eelgrass or garweed. It is a fast growing and readily colonizing species that serves as a feeding ground for wading birds and aquatic animals, and a breeding ground for juvenile fish and shrimp species.

Halophila baillonis is a species of aquatic plant in the family Hydrocharitaceae. It is referred to by the common name clover grass. It is native to Brazil, Cayman Islands, Colombia, Costa Rica, Jamaica, Leeward Islands, Netherlands Antilles, Panama, Puerto Rico, Trinidad and Tobago, and Venezuela. It is listed on the IUCN Red List as "vulnerable" due to its naturally rare occurrence and fragmented populations.

<i>Halophila stipulacea</i> Species of plant in the family Hydrocharitaceae

Halophila stipulacea is a species of seagrass in the Hydrocharitaceae family. It is native to the Indian Ocean that spread into the Mediterranean after the opening of the Suez Canal. This seagrass is widespread through the Gulf of Aqaba. Recently it has arrived in the Caribbean where it is also spreading.

<span class="mw-page-title-main">Trachycarpeae</span> Tribe of palms

Trachycarpeae is a tribe of palms in subfamily Coryphoideae of the plant family Arecaceae. It has the widest distribution of any tribe in Coryphoideae and is found on all continents, though the greatest concentration of species is in Southeast Asia. Trachycarpeae includes palms from both tropical and subtropical zones; the northernmost naturally-occurring palm is a member of this tribe. Several genera can be found in cultivation in temperate areas, for example species of Trachycarpus, Chamaerops, Rhapidophyllum and Washingtonia.

References

  1. 1 2 3 "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org. Retrieved 2017-01-31.
  2. Louis-Marie Aubert du Petit-Thouars 1806. Genera Nova Madagascariensia 2
  3. 1 2 3 4 5 Phillips, Edwin Percy (1951). The genera of South African flowering plants. South Africa: Government Printer.
  4. Halophila engelmannii star grass Archived 2015-09-12 at the Wayback Machine Florida Fish and Wildlife Conservation Commission. Retrieved 2012-01-28.
  5. Stearn, William (1972). A Gardenerer's Dictionary of Plant Names. London: Cassell. ISBN   0304937215.