Scaevola taccada | |
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In its typical habitat; Maui, Kanaha Beach | |
Flower | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Asterales |
Family: | Goodeniaceae |
Genus: | Scaevola |
Species: | S. taccada |
Binomial name | |
Scaevola taccada (Gaertn.) Roxb. | |
Synonyms [1] | |
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Scaevola taccada, also known as beach cabbage, sea lettuce, or beach naupaka, is a flowering plant in the family Goodeniaceae found in mangrove swamps and rocky or sandy coastal locations in the tropical areas of the Indo-Pacific. [1] [4] It is a common beach shrub throughout the Arabian Sea, the tropical Indian Ocean and the tropical islands of the Pacific Ocean.
There has long been confusion over the correct scientific name for this species. It is also known by the synonym Scaevola sericea. [2] [3]
Scaevola taccada is a large bush that grows up to about 3–10 metres typical of littoral zones where it grows very close to the sea exposed to the salt spray, usually on sandy or pebbly soils. [5] The branchlets are 1–1.5 cm thick with white tufts at the leaf axils. [3] : 339–340
Leaves are slightly succulent about 8–25 cm cm long, closely alternate or in a spiral and crowded at the stem tips. [4] They are glabrous with a fleshy-looking yellowish green color.
It flowers every time of the year in fan-like clusters which gives them the name fanflower or half flower. Each flower has white petals between 2–2.5 cm long, sometimes with violet stripes. Each flower has a curved style. They are pollinated by large bees or on its own. [4]
The fruit is a round, fleshy drupe between 1–15 mm. It is similar to the fruit of S. plumieri – both were included in the original circumscription of the species. S. taccada has evident calyx lobes and white fruit on which the calyx lobes persist. S. plumieri has short or absent lobes on its calyx and its fruit turns black fruit when ripe, [6] but ripe S. taccada fruit turns from green to white. [4] They can float in seawater and are propagated by ocean currents, this bush is a pioneer plant in new sandbanks in tropical areas. [7]
Two shrubby Scaevola species occur along the coasts of tropical and subtropical regions of the world. They sometimes occur in the same region, but one is more western, reaching Atlantic coasts, and one more eastern, reaching out into the Pacific. Carl Linnaeus initially included both species in his Lobelia plumieri, which he later considered to be the sole species in his new genus Scaevola (although the combination Scaevola plumieri was first published by Martin Vahl). [6] There has been confusion for many years over the correct name of the two species when they are recognized as distinct. [8] [9] Scaevola plumieri (L.) Vahl is now used as the name for the western species.
The earliest name now recognized as applying to the eastern species, Lobelia taccada, was published by Joseph Gaertner in 1788. William Roxburgh indirectly referred to this name when transferring it to the genus Scaevola in 1788. [10] Separately, and later, Martin Vahl described Scaevola sericea in 1791, based on a specimen from Niue, a small island in the south Pacific Ocean. [11] In 1980, Jeffrey argued that the correct name for the species was Scaevola sericea, since Roxburgh's transfer was not acceptable under the nomenclature code. [6] However, Green in 1991 considered that Jeffrey was mistaken, the transfer being valid, so that the correct name for the eastern species was Scaevola taccada, [12] the name used, for example, by the online Flora of China. [2] The International Plant Names Index accepts this analysis. [10]
The species is found in coastal areas and beaches of Okinawa, Taiwan, Southern China, Vietnam, Malaysia, Philippines, Indonesia, East Timor, Northern Australia, Polynesia, Melanesia, Micronesia, East Africa, Madagascar, Mauritius, Seychelles, Oman, Yemen, India, Maldives, Burma, Thailand, Cambodia, Chagos Islands, Comoros, and Réunion.
In the United States (Florida, Puerto Rico, US Virgin Islands) as well as many other Caribbean nations and the Bahamas, Scaevola taccada has become an invasive species, pushing away the native Caribbean Scaevola plumieri species from its native habitat. [13]
Scaevola taccada typically grows directly on the beaches of tropical coasts with a preference for beach crests on coral sands. It grows within the salt spray area and it is amongst the first pioneer plant colonisers on tropical atolls and sandbanks. Besides seeds, it is easily propagated from cuttings. [14]
It prefers well drained sandy soils and it is a very salt tolerant scrub. However, its roots cannot stand direct seawater that rises frequently. [4] Scaevola taccada is sometimes found growing in loose plant communities with coconut palms, soldierbush, beach morning glory, beach gardenia, several pandanus species, beach calophyllum followed by portia tree, sea almond, beach hibiscus, Cordia subcordata and others. The plant is often featured prominently on tropical island postcards and wallpapers.
In some islands of the Pacific, Scaevola taccada is used to prevent coastal erosion as well as for landscaping. It is also planted on the beach crests to protect other cultivated plants from the salt spray.
S. taccada trees provide a safe and shady environment for female green turtles coming to shore to lay their eggs. [15] : 34–35
Parts of the plant are also used in Polynesian and Asian traditional medicine. [16] Drops from the plant were used in cases of eye irritation by Chamorro breath-hold spearfishermen in the Mariana Islands. [17] Historically in the Maldives the leaves of this plant were often used as famine food. [18]
Scaevola is a genus of flowering plants in the Goodenia family, Goodeniaceae. It consists of more than 130 species, with the center of diversity being Australia and Polynesia. There are around 80 species in Australia, occurring throughout the continent, in a variety of habitats. Diversity is highest in the South West, where around 40 species are endemic.
Rhodomyrtus tomentosa also known as rose myrtle, is a flowering plant in the family Myrtaceae, native to southern and southeastern Asia, from India, east to southern China, Hong Kong, Taiwan and the Philippines, and south to Malaysia and Sulawesi. It grows in coasts, natural forest, riparian zones, wetlands, moist and wet forests, bog margins, from sea level up to 2400 m elevation.
Goodeniaceae is a family of flowering plants in the order Asterales. It contains about 404 species in twelve genera. The family is distributed mostly in Australia, except for the genus Scaevola, which is pantropical. Its species are found across most of Australia, being especially common in arid and semi-arid climates.
Sesbania tomentosa, commonly known as Oahu riverhemp and ʻōhai, is an endangered species of plant in the pea family, Fabaceae, that is endemic to the main Hawaiian Islands as well as Nihoa and Necker Island. It inhabits low shrublands and, rarely, dry forests, at elevations from sea level to 2,500 ft (760 m). Associated native plant species include akiʻaki, ilima, naupaka kahakai, and pili. Off-road vehicles, wildfires, grazing, and alien species competition have destroyed their habitat on the main islands, but they are still quite common on Nihoa and Necker. At least 2000 specimens grow on Nihoa, while there are far less on Necker.
The wildlife of the Maldives includes the flora and fauna of the islands, reefs, and the surrounding ocean. Recent scientific studies suggest that the fauna varies greatly between atolls following a north–south gradient, but important differences between neighbouring atolls were also found, which may be linked to differences in fishing pressure – including poaching.
Guettarda speciosa, with common names sea randa, or zebra wood, is a species of shrub in the family Rubiaceae found in coastal habitats in tropical areas around the Pacific Ocean, including the coastline of central and northern Queensland and Northern Territory in Australia, and Pacific Islands, including Micronesia, French Polynesia and Fiji, Malaysia and Indonesia, Maldives and the east coast of Africa. It reaches 6 m in height, has fragrant white flowers, and large green prominently-veined leaves. It grows in sand above the high tide mark.
Scaevola coriacea, the dwarf naupaka, is one of the ten Scaevolas, that are endemic to Hawaii.
Acanthus ebracteatus is a species of shrubby herb that grows in the undergrowth of mangroves of south-east Asia. Common names include sea holly and holly mangrove.
Scaevola glabra, the 'ohe naupaka, is a shrub in the family Goodeniaceae. The flowers are yellow.
Roscoea capitata is a perennial herbaceous plant native to the Himalayas, being found in Nepal. Most members of the ginger family (Zingiberaceae), to which it belongs, are tropical, but R. capitata, like other species of Roscoea, grows in much colder mountainous regions.
Roscoea forrestii is a perennial herbaceous plant occurring in the Sichuan and Yunnan provinces of China. Most members of the ginger family (Zingiberaceae), to which it belongs, are tropical, but R. forrestii, like other species of Roscoea, grows in much colder mountainous regions. It is sometimes grown as an ornamental plant in gardens. It was named after George Forrest (1873–1932) who discovered it in Yunnan.
Roscoea praecox is a perennial herbaceous plant occurring in the Yunnan province of China. Most members of the ginger family (Zingiberaceae), to which it belongs, are tropical, but R. praecox, like other species of Roscoea, grows in much colder mountainous regions. It is sometimes grown as an ornamental plant in gardens.
Scaevola acacioides, is an erect, spreading shrub in the family Goodeniaceae.
Scaevola basedowii is an erect multi-stemmed shrub in the family Goodeniaceae, endemic to Western Australia, the Northern Territory and South Australia.
Scaevola plumieri is a species of plant in the family Goodeniaceae which grows on coastal dunes in the tropics and subtropics.
Scaevola enantophylla, commonly known as climbing fan-flower,is a species of flowering plant in the family Goodeniaceae and is endemic to Queensland. It is a scrambling vine with yellow fan-shaped flowers, and the only species in the genus with leaves arranged opposite.
The Maldives–Lakshadweep–Chagos Archipelago tropical moist forests is a tropical moist broadleaf forest ecoregion in South Asia. It spans a chain of coralline islands in the Indian Ocean, including Lakshadweep, a union territory of India; the Maldives, an independent country; and the British Indian Ocean Territory, an overseas territory of the United Kingdom.
Ruspolia is a genus of flowering plants belonging to the family Acanthaceae.
Scaevola spicigera is a species of flowering plant in the family Goodeniaceae. It is a small, spreading shrub with white flowers and is endemic to Western Australia.