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Cabomba

Cabomba is a genus of perennial, rhizomatous, aquatic herbs in the family Cabombaceae native to tropical and subtropical America. It has divided submerged leaves in the shape of a fan (hence the vernacular name fanwort) and is much favoured by aquarists as an ornamental and oxygenating plant for fish tanks. One species, Cabomba caroliniana, is a nationally declared weed in Australia, where it has choked up waterways after escaping from aquaria.

Cabomba are perennial, rhizomatous, aquatic herbs with short, brown rhizomes. The roots, which are formed on the lower nodes of the stems, are delicate, brown to white, and branched. The long, cylindrical, flexible, delicate, branched or unbranched stems are 2–4 mm wide, and up to 4 m long. Both floating and submerged leaves are present, but only few floating leaves are produced, and they may be absent entirely. The submerged leaves are divided into 3–7 dichotomously or trichotomously branched parts. The floating leaves are inconspicuous.

The solitary, hermaphrodite, pedicellate, chasmogamous, scentless, actinomorphic, white, yellow, or purple, trimerous or rarely di- and tetramerous flowers extend beyond the water surface. The petals are oval-shaped, and are usually about 2.0 cm (0.79 in) across when fully developed. The petals are unlike the sepals in that the former have two yellow ear-shaped nectaries at the base. Petals may also have purplish edges. Flowers are protogynous, having primarily female sexual structures on the first day of appearance and then switching to male on the second and subsequent days. Pollination occurs above the waterline. Principal pollinators are flies and other small flying insects.

Various chromosome counts have been observed in Cabomba: 2n = 26, 39, 52, 78, 104.

It was published by Jean Baptiste Christophore Fusée Aublet in 1775. The type species is Cabomba aquatica Aubl.

The genus Cabomba Aubl. consists of six extant species:

And four fossil species:

It has been speculated, that Cabomba haynesii may be a result of a hybridisation event involving Cabomba palaeformis and Cabomba furcata.

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genus of aquatic plants
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