Vallisneria spiralis
| Vallisneria spiralis | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Alismatales |
| Family: | Hydrocharitaceae |
| Genus: | Vallisneria |
| Species: | V. spiralis
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| Binomial name | |
| Vallisneria spiralis | |
| Synonyms | |
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Vallisneria spiralis, also known as straight vallisneria, tape grass, or eel grass is a common aquarium plant that prefers good light and a nutrient rich substrate. In the wild, it can be found in tropical and sub-tropical regions worldwide.
Overview
[edit]It has narrow, linear leaves that range in colour from a pale-green to reddish up to 3 feet (1 m) long and up to 0.75 inches broad. V. spiralis is monoecious with male flowers carried on long spiral stalks that break away from the plant and float on the water's surface. In the variety V.s, gigantea the female flowers are on stalks (pedicels) up to six feet (1.85 meters) in length. After the female flowers have been pollinated, the pedicel curls up like a tendril, drawing the young fruit closer to the bed of the stream or pond; thus the name "spiralis".[2] Seeds have not been observed germinating in aquaria. Instead, it most often propagates by runners which can lead to dense stands.[citation needed]
One form of this plant has been described: V. spiralis f. tortifolia, which has also been elevated to the species level by some taxonomists under the name V. tortissima. The form has tightly twisted leaves. Along with this form, many other trade names have been developed for small variations on the species. Their taxonomic status is uncertain.[citation needed]
Invasive species
[edit]The species is an effective invader due to its efficient dispersal, vegetative reproduction, high biomass production, and popularity in the aquarium trade.[3] V. spiralis is an "unwanted organism" in New Zealand.[4] It is listed on the National Pest Plant Accord prohibiting it from sale and commercial propagation and distribution. Since 2013 V. spiralis has been listed as a naturalized alien in Iceland, where it was recorded in geothermal ponds.[3]
References
[edit]- ^ Lansdown, R.V. (2019). "Vallisneria spiralis". IUCN Red List of Threatened Species. 2019: e.T164121A120206775. doi:10.2305/IUCN.UK.2019-2.RLTS.T164121A120206775.en. Retrieved 10 November 2024.
- ^ Perry, Francis (1961). Water Gardening. London: Country Life. p. 172.
- ^ a b Wasowicz, Pawel; Przedpelska-Wasowicz, Ewa; Gudmundsdottir, Lara; Tamayo, Mariana (1 August 2014). "Vallisneria spiralis and Egeria densa (Hydrocharitaceae) in arctic and subarctic Iceland". New Journal of Botany. 4 (2): 85–89. Bibcode:2014NJBot...4...85W. doi:10.1179/2042349714Y.0000000043. S2CID 85764375.
- ^ "Eelgrass". MAF Biosecurity New Zealand. 11 December 2008. Retrieved 12 November 2010.
External links
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