|A variegated cultivar, |
Sansevieria trifasciata 'Laurentii'
|Feral Sansevieria trifasciata with fruits|
Sansevieria trifasciata is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo. It is most commonly known as the snake plant, mother-in-law's tongue, and viper's bowstring hemp, among other names.
It is an evergreen perennial plant forming dense stands, spreading by way of its creeping rhizome, which is sometimes above ground, sometimes underground. Its stiff leaves grow vertically from a basal rosette. Mature leaves are dark green with light gray-green cross-banding and usually range from 70–90 centimetres (28–35 in) long and 5–6 centimetres (2.0–2.4 in) wide, though it can reach heights above 2 m (6 ft) in optimal conditions.
Sansevieria trifasciata is commonly called "mother-in-law's tongue" or "snake plant", because of the shape and sharp margins of its leaves. It is also known as the "viper's bowstring hemp", because it is one of the sources for plant fibers used to make bowstrings.
In Eurasia, it is known as hǔwěilán (虎尾兰 or 虎尾蘭, "tiger's tail orchid") in China; tora no o (とらのお, "tiger's tail") in Japan; and paşa kılıcı ("pasha's sword") in Turkey. In South America, it is known as espada de São Jorge ("sword of Saint George") in Brazil. In the Netherlands and Flanders (Belgium), the plant is also known as "vrouwentong" (women's tongue).
Cultivation and uses
It is now used predominantly as an ornamental plant, outdoors in warmer climates, and indoors as a houseplant in cooler climates. It is popular as a houseplant because it is tolerant of low light levels and irregular watering; during winter it needs only one watering every couple of months. It will rot easily if overwatered.
The NASA Clean Air Study found S. trifasciata has air purification qualities, removing 4 of the 5 main toxins. It exchanges oxygen and carbon dioxide using the crassulacean acid metabolism process, unique because few plant species have adapted it. It allows them to withstand drought. The microscopic pores on the plant's leaves, called the stomata and used to exchange gases, are only opened at night to prevent water from escaping via evaporation in the hot sun. As a result, oxygen is released at night, unlike most plants that only exchange gases during the day.
Numerous cultivars have been selected, many of them for variegated foliage with yellow or silvery-white stripes on the leaf margins. Popular cultivars include 'Compacta', 'Goldiana', 'Hahnii', 'Laurentii', 'Silbersee', and 'Silver Hahnii'. 'Hahnii' was discovered in 1939 by William W. Smith, Jr. in the Crescent Nursery Company, New Orleans, Louisiana. The 1941 patent was assigned to Sylvan Frank Hahn, Pittsburgh, Pennsylvania.
S. trifasciata is considered by some authorities as a potential weed in Australia, although widely used as an ornamental, in both the tropics outdoors in both pots and garden beds and as an indoor plant in temperate areas.
In its native range in Africa, a yellow-tipped cultivar is associated with Oya, the female orisha of storms. In Nigeria it is commonly linked with Ogun, the Orisha of war, and is used in rituals to remove the evil eye. In Brazil its common name espada de São Jorge links it to Saint George, whom by syncretism is also associated with Ogun.
- "Sansevieria trifasciata". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 2012-12-31.
- Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
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- Smith, William Walter. "Sansevieria". Plant Patent 470. United States Patent Office. Retrieved March 26, 2013.
- "Sansevieria trifasciata var. laurentii (v) AGM". Royal Horticultural Society. Retrieved March 26, 2013.
- "Sansevieria trifasciata 'Bantel's Sensation' AGM". Royal Horticultural Society. Retrieved March 26, 2013.
- "Sansevieria Production Guide".
- S. Csurhes and R. Edwards (1998). "Potential environmental weeds in Australia: Candidate species for preventative control" (PDF). Queensland Department of Natural Resources. Archived from the original (PDF) on October 10, 2007. Retrieved March 26, 2013.
- "Mother-in-Law's Tongue". ASPCA.
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