Dischidia major: Difference between revisions
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'''''Dischidia major''''' or '''Malayan Urn Vine''' is an unusual plant first encountered in 1772 as a specimen sent from [[Madras]] to [[Nathaniel Wallich]], the curator of the [[Calcutta Botanical Garden]]. He published a description in the second volume of ''[[Plantae Asiaticae Rariores]]'' and named it ''Dischidia rafflesiana'' in honour of his late friend Sir [[Stamford Raffles]], the founder of [[Singapore]]. The honorific did not survive the test of time, but the peculiar morphology of the plant persists |
'''''Dischidia major''''' or '''Malayan Urn Vine''' is an unusual plant first encountered in 1772 as a specimen sent from [[Madras]] to [[Nathaniel Wallich]], the curator of the [[Calcutta Botanical Garden]]. He published a description in the second volume of ''[[Plantae Asiaticae Rariores]]'' and named it ''Dischidia rafflesiana'' in honour of his late friend Sir [[Stamford Raffles]], the founder of [[Singapore]]. The honorific did not survive the test of time, but the peculiar morphology of the plant persists. |
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''Dischidia'' is a genus of some 80 species of trailing, twining or scandent, succulent epiphytes found throughout the tropics of [[Asia]] ([[New Guinea]], [[Moluccas]], [[Philippines]], [[India]], tropical [[Australia]], [[Hong Kong]], [[Taiwan]]) through to the western Pacific. They carry modified leaves, offering accommodation to ants, including those of the family [[Dolichoderinae]], and in return gain some sustenance from increased carbon dioxide and nitrogen levels, and a degree of protection from noxious animals and plants.<ref>[http://www.ehleringer.net/Jim/Publications/195.pdf ''Absorption of Ant-provided Carbon dioxide and Nitrogen by a Tropical Epiphyte'']</ref> This [[Mutualism (biology)|mutualism]] trait, known as [[myrmecophily]], is widespread across the plant world and clearly carries considerable benefits for both ants and plant.<ref>[http://aob.oxfordjournals.org/content/os-7/2/223.extract Annals of Botany]</ref> |
''Dischidia'' is a genus of some 80 species of trailing, twining or scandent, succulent epiphytes found throughout the tropics of [[Asia]] ([[New Guinea]], [[Moluccas]], [[Philippines]], [[India]], tropical [[Australia]], [[Hong Kong]], [[Taiwan]]) through to the western Pacific. They carry modified leaves, offering accommodation to ants, including those of the family [[Dolichoderinae]], and in return gain some sustenance from increased carbon dioxide and nitrogen levels, and a degree of protection from noxious animals and plants.<ref>[http://www.ehleringer.net/Jim/Publications/195.pdf ''Absorption of Ant-provided Carbon dioxide and Nitrogen by a Tropical Epiphyte'']</ref> This [[Mutualism (biology)|mutualism]] trait, known as [[myrmecophily]], is widespread across the plant world and clearly carries considerable benefits for both ants and plant.<ref>[http://aob.oxfordjournals.org/content/os-7/2/223.extract Annals of Botany]</ref> |
Revision as of 20:05, 15 November 2015
Dischidia major | |
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Plate 142 from Plantae Asiaticae Rariores | |
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Species: | D. major
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Dischidia major | |
Synonyms[1] | |
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Dischidia major or Malayan Urn Vine is an unusual plant first encountered in 1772 as a specimen sent from Madras to Nathaniel Wallich, the curator of the Calcutta Botanical Garden. He published a description in the second volume of Plantae Asiaticae Rariores and named it Dischidia rafflesiana in honour of his late friend Sir Stamford Raffles, the founder of Singapore. The honorific did not survive the test of time, but the peculiar morphology of the plant persists.
Dischidia is a genus of some 80 species of trailing, twining or scandent, succulent epiphytes found throughout the tropics of Asia (New Guinea, Moluccas, Philippines, India, tropical Australia, Hong Kong, Taiwan) through to the western Pacific. They carry modified leaves, offering accommodation to ants, including those of the family Dolichoderinae, and in return gain some sustenance from increased carbon dioxide and nitrogen levels, and a degree of protection from noxious animals and plants.[2] This mutualism trait, known as myrmecophily, is widespread across the plant world and clearly carries considerable benefits for both ants and plant.[3]
Dischidia major twines around the branches and trunks of trees, having a preference for those that are decaying. It produces both circular succulent leaves of about 2 cm diameter, and hollow, pouch-like 12 cm long leaves, reminiscent of the fruits of Araujia sericifera, a related species. These modified leaves, pitchers or ascidia, are purplish and richly dotted with stomata on the inner surface,[4] and have an opening at the top end near the stalk. Organic debris and rainwater, possibly augmented by secreted fluids, accumulate in the cavity over the course of time, offering a source of nutrition which the plant utilises by growing roots into the chamber. Dischidia astephana and D. parvifolia do not provide housing for resident ants, but have roots that penetrate decaying wood and humus, reaching into the ant nests and presumably obtaining nutrients from the ant waste there.[5][6]
Dischidia major flowers are yellow striped with green, and arranged in few or many-flowered umbels. The fruit of D. major consists of the usual horn-shaped pair of follicles while the seed has a tuft of silky hairs at one end and includes an edible portion or elaiosome as incentive for ants to move the seed (myrmecochory) into nests inside the tree with an improved chance of germination and growth.
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Plate from Richard Wettstein's Handbuch der Systematischen Botanik 1924
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Plate from Smithsonian Institution report, 1896
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Plate from Anton Joseph Kerner von Marilaun, Adolf Hansen: Pflanzenleben
Bibliography
- The Ecology and Evolution of Ant-Plant Interactions - Victor Rico-Gray & Paulo S. Oliveira (University of Chicago Press, 2007)
External links
- Gallery of Dischidia species
- Dischidia major
- Philidris sp. and Dischidia major
- Philidris ants living inside Dischidia epiphytes from Thailand
References
- ^ The Plant List: A Working List of All Plant Species, retrieved 15 November 2015
- ^ Absorption of Ant-provided Carbon dioxide and Nitrogen by a Tropical Epiphyte
- ^ Annals of Botany
- ^ On the Structure of the Ascidia and Stomata of Dischidia rafflesiana Wall.
- ^ A reassessment of the relations in Malaysia between ants (Crematogaster) on trees (Leptospermum and Dacrydium) and epiphytes of the genus Dischidia
- ^ Structure of the Ascidia