Brasenia | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Order: | Nymphaeales |
Family: | Cabombaceae |
Genus: | Brasenia Schreb. |
Species: | B. schreberi |
Binomial name | |
Brasenia schreberi | |
Synonyms [3] | |
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Brasenia is a genus belonging to the family Cabombaceae, consisting of one species, Brasenia schreberi, commonly known as watershield. It is widely distributed in North America, the West Indies, northern South America (Venezuela, Guyana), eastern Asia (China, Japan, Korea, Primorye), Australia, the Indian Subcontinent, and parts of Africa. [3] [4] [5] [6] [7] [8] [9]
Brasenia is a perennial aquatic plant with floating, peltate leaves and rhizomatous stems. It is identified by its bright green leaves, small purple flowers that bloom from June through September, and a thick mucilage that covers all of the underwater organs, including the underside of the leaves, stems, and developing buds. This mucilage may be an anti-herbivore defence trait, [10] perhaps to deter snail grazing. It grows in shallow water of lakes, rivers and beaver ponds, particularly those with somewhat acidic water.
Brasenia exhibits wind pollination. The flowers have a two-day blooming period. On the first day, the functionally female, or pistillate flower, extends above the surface of the water and exposes the receptive stigmas. The flower then recedes below the water surface and on the following day emerges as a functionally male, or staminate flower. It is elevated higher than on the previous day and the anther-bearing filaments are extended beyond the female carpels. [11] The anthers dehisce, releasing the pollen, and the flower is then withdrawn below the water where the fruit develops.
The chloroplast genome is 158951 bp long. [12] The mitochondrial genome is composed of six parts ranging from 110220 bp to 628257 bp in size. The complete mitogenome is 1.49 Mb long. [13] The nuclear genome is 1170.4 Mb long. [14]
Brasenia is cultivated as a vegetable in China (where it is known as chúncài 莼菜 ) and where it is used in Hangzhou in the well-known local speciality "West Lake Water Shield Soup" [15] and in Japan.
The mucilage it produces has been found to have anti-algal and anti-bacterial properties that may be useful as a natural weed control. [16]
Species of Brasenia occurred during the interglacial of Europe, but like many other aquatic plant species and genera, it does not occur there now. [17]
Brasenia schreberi has the common name watershield. [2]
The genus may commemorate the surgeon and Moravian missionary Christoph Brasen (1738-1774), who was the first superintendent of the Moravian mission at Nain in Labrador. [18]
It is classified as least concern (LC) by The IUCN Red List. [1] It is classified as vulnerable (VU) in South Korea. [19] The NatureServe conservation status is G5 Secure. [2] Under the Flora and Fauna Guarantee Act 1988, it is categorised as Critically Endangered (CR). [20]
The Nymphaeales are an order of flowering plants, consisting of three families of aquatic plants, the Hydatellaceae, the Cabombaceae, and the Nymphaeaceae. It is one of the three orders of basal angiosperms, an early-diverging grade of flowering plants. At least 10 morphological characters unite the Nymphaeales. One of the traits is the absence of a vascular cambium, which is required to produce both xylem (wood) and phloem, which therefore are missing. Molecular synapomorphies are also known.
Nymphaeaceae is a family of flowering plants, commonly called water lilies. They live as rhizomatous aquatic herbs in temperate and tropical climates around the world. The family contains five genera with about 70 known species. Water lilies are rooted in soil in bodies of water, with leaves and flowers floating on or rising from the surface. Leaves are oval and heart-shaped in Barclaya. Leaves are round, with a radial notch in Nymphaea and Nuphar, but fully circular in Victoria and Euryale.
Droseraceae is a family of carnivorous flowering plants, also known as the sundew family. It consists of approximately 180 species in three extant genera, the vast majority being in the sundew genus Drosera. The family also contains the well-known Venus flytrap and the more obscure waterwheel plant, both of which are the only living species of their respective genera. Representatives of the Droseraceae are found on all continents except Antarctica.
The Cabombaceae are a family of aquatic, herbaceous flowering plants. A common name for its species is water shield. The family is recognised as distinct in the Angiosperm Phylogeny Group IV system (2016). The family consists of two genera of aquatic plants, Brasenia and Cabomba, totalling six species.
Ruppia, also known as the widgeonweeds, ditch grasses or widgeon grass, is the only extant genus in the family Ruppiaceae, with eight known species. These are aquatic plants widespread over much of the world. The genus name honours Heinrich Bernhard Rupp, a German botanist (1688–1719). They are widespread outside of frigid zones and the tropics.
Euryale ferox, commonly known as prickly waterlily, makhana, or Gorgon plant, is a species of water lily found in southern and eastern Asia, and the only extant member of the genus Euryale. The edible seeds, called fox nuts or makhana, are dried, and eaten predominantly in Asia.
Barclaya is a genus of six species of flowering plants of the family Nymphaeaceae. Barclaya are aquatic plants native to tropical Asia. The genus was named in honour of the American-born English brewer and patron of science Robert Barclay.
Nuphar lutea, the yellow water-lily, brandy-bottle, or spadderdock, is an aquatic plant of the family Nymphaeaceae, native to northern temperate and some subtropical regions of Europe, northwest Africa, and western Asia. This species was used as a food source and in medicinal practices from prehistoric times with potential research and medical applications going forward.
Plant reproduction is the production of new offspring in plants, which can be accomplished by sexual or asexual reproduction. Sexual reproduction produces offspring by the fusion of gametes, resulting in offspring genetically different from either parent. Asexual reproduction produces new individuals without the fusion of gametes, resulting in clonal plants that are genetically identical to the parent plant and each other, unless mutations occur.
Nymphaea mexicana is a species of aquatic plant that is native to the Southern United States and Mexico as far south as Michoacán. Common names include yellow water lily, Mexican water lily and banana water lily.
Cabomba caroliniana, commonly known as Carolina fanwort and various other names, is an aquatic perennial herbaceous plant native to North and South America. Having been a popular aquarium plant, it has been exported around the world, and has become an invasive species in Europe and Australia.
Cabomba furcata is a species of aquatic plant in the water shield family known by the common names red cabomba and forked fanwort. It is native to Central and South America and as far north as Cuba and the tip of Florida. It reaches a maximum height between 30 and 80 centimetres and is up to 8 centimetres (3.1 in) wide. It bears purple flowers.
Nymphaea odorata, also known as the American white waterlily, fragrant water-lily, beaver root, fragrant white water lily, white water lily, sweet-scented white water lily, and sweet-scented water lily, is an aquatic plant belonging to the genus Nymphaea. It can commonly be found in shallow lakes, ponds, and permanent slow moving waters throughout North America where it ranges from Central America to northern Canada. It is also reported from Brazil and Guyana.
The basal angiosperms are the flowering plants which diverged from the lineage leading to most flowering plants. In particular, the most basal angiosperms were called the ANITA grade, which is made up of Amborella, Nymphaeales and Austrobaileyales.
Peltandra virginica is a plant of the arum family known as green arrow arum and tuckahoe. It is widely distributed in wetlands in the eastern United States, as well as in Quebec, Ontario, and Cuba. It is common in central Florida including the Everglades and along the Gulf Coast. Its rhizomes are tolerant to low oxygen levels found in wetland soils. It can be found elsewhere in North America as an introduced species and often an invasive plant.
Cabomba aquatica is a popular aquarium plant that belongs to the family Cabombaceae and genus Cabomba. It is a perennial aquatic plant that lives in fresh standing water or in lakes and rivers with slight currents.
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.
Trithuria inconspicua is a small aquatic herb of the family Hydatellaceae that is only found in New Zealand.
Cabomba schwartzii is a species of aquatic plant in the family Cabombaceae endemic to North Brazil.
Trithuria filamentosa is a species of aquatic plant in the family Hydatellaceae endemic to Tasmania, Australia.