Derivation of specific name
provided by Flora of Zimbabwe
johnstonii: after Sir Henry (Harry) Hamilton Johnston (1858-1927), British administrator and explorer, who collected flora and fauna specimens in many parts of Afrca. His best known discovery likely is the okapi, which he first found and
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- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Disperis johnstonii Rolfe Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=117800
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- Mark Hyde
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- Bart Wursten
- author
- Petra Ballings
Description
provided by Flora of Zimbabwe
Small terrestrial herb, up to 15 cm high, growing from ovoid to globose, hairy tubers, 7-15 mm long. Leaves 2-3, alternate, ovate, 2-3 cm long, clasping the stem at the base, dark green with whitish veining, purple beneath. Inflorescences 1-5-flowered. Dorsal sepal and petals yellow (sometimes pale purple in East Africa), forming an open hood; lateral sepals white or very pale mauve. Lip 4-6.5 mm long, claw bent back on itself near the base bearing a 2-lobed appendage with papillose lobes; claw ending in an ovate to amost round blade with a papillose protuberance in the centre.
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- Mark Hyde, Bart Wursten and Petra Ballings
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- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Disperis johnstonii Rolfe Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=117800
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Description
provided by Flora of Zimbabwe
Erect, terrestrial herbs arising from
small tubers and growing in very shallow soil or leaf mould in
forest. Leaves 1-few, alternate or opposite. Flowers solitary or
in racemes, Bracts leaf-like. Dorsal sepal united with the petals
to form a hood-like structure varying from a ± flat limb
to an elongate spur; lateral sepals each usually with a
conspicuous spur or pouch near the inner margin. Petals variously
shaped, often falcate. Lip greatly modified and characteristic
of the species, joined to the column and bearing a
distinctive appendage.
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- Mark Hyde, Bart Wursten and Petra Ballings
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- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Disperis Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/genus.php?genus_id=422
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Frequency
provided by Flora of Zimbabwe
Local
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- cc-by-nc
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- Mark Hyde, Bart Wursten and Petra Ballings
- bibliographic citation
- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Disperis johnstonii Rolfe Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=117800
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Worldwide distribution
provided by Flora of Zimbabwe
Nigeria, Cameroon, Tanzania, Malawi, Mozambique, Zambia and Zimbabwe.
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- Mark Hyde, Bart Wursten and Petra Ballings
- bibliographic citation
- Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Disperis johnstonii Rolfe Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/species.php?species_id=117800
- author
- Mark Hyde
- author
- Bart Wursten
- author
- Petra Ballings
Disperis
provided by wikipedia EN
Disperis is a genus of plants in the orchid family, Orchidaceae. It has about 78 species.[1] Most of the species are from tropical and southern Africa, as well as Indian Ocean islands. A few are native to the tropical or the warmer subtropical regions of Asia and Malesia.
Etymology
The genus name Disperis derives from the ancient greek δίς (dís), meaning "twice", and πήρα (pḗra), meaning "bag", "pouch",[2][3] because of to the pouches formed by the lateral sepals.[4]
Range and variation
Disperis consists of two subgenera, Disperis and Dryorkis.[5] Subgenus Disperis has been well sampled in a molecular phylogenetic study,[6] but subgenus Dryorkis has not. Subgenus Disperis has about 30 species and is distinguished by an entire lip appendage. Most of its species are from southern Africa. A few are from East Africa and Madagascar. Subgenus Dryorkis has about 48 species and is distinguished by a 2-lobed lip appendage. It is found throughout tropical Africa as well as Madagascar and nearby islands, and it has one widespread species in tropical Asia.
Pollination
Like members of the subtribe Coryciinae sensu stricto, Disperis is pollinated by oil collecting bees of the genus Rediviva. The oil is produced on the lip appendage, usually near its apex. Disperis has independently evolved a floral morphology much like that of Coryciinae s.s. in order to attract these pollinators.
Relationships
In the Genera Orchidacearum work, Disperis has been placed in the subtribe Coryciinae.[7] However, molecular phylogeny studies challenged this taxonomic view. Analysis of the nuclear ribosomal ITS first suggested the polyphyly of Coryciinae as Disperis did not branch with Corycium and Pterygodium.[8] Moreover, Disperis appeared more closely related to Brownleea than to the subtribe Coryciinae, though this affinity did not receive strong statistical support.[6] In a classification of orchids that was published in 2015, Disperis was transferred to the subtribe Brownleeinae.[1] Brownleea and Disperis have a similar pollen structure and an upright labellum that lies over the front of the stigma. A median sepal spur is found in all six species of Brownleea and in many species of Disperis.[6]
References
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^ a b Mark W. Chase, Kenneth M. Cameron, John V. Freudenstein, Alec M. Pridgeon, Gerardo A. Salazar, Cássio van den Berg, and André Schuiteman. 2015. "An updated classification of Orchidaceae". Botanical Journal of the Linnean Society 177(2):151-174. (See External links below).
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^ Bailly, Anatole (1981-01-01). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 978-2010035289. OCLC 461974285.
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^ Bailly, Anatole. "Greek-french dictionary online". www.tabularium.be. Retrieved 2017-01-24.
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^ Umberto Quattrocchi. 2000. CRC World Dictionary of Plant Names volume II. CRC Press: Boca Raton; New York; Washington, D.C.; USA. London, UK. ISBN 978-0-8493-2676-9 (vol. II).
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^ Hubert Kurzweil and John C. Manning. 2005. "A synopsis of the genus Disperis Sw. (Orchidaceae)". Adansonia 27(2):155-207.
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^ a b c Richard J. Waterman, Anton Pauw, Timothy G. Barraclough, and Vincent Savolainen. 2009. "Pollinators underestimated: A molecular phylogeny reveals widespread floral convergence in oil-secreting orchids (sub-tribe Coryciinae) of the Cape of South Africa". Molecular Phylogenetics and Evolution 51(1):100-110. doi:10.1016/j.ympev.2008.05.020.
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^ Alec M. Pridgeon; Phillip J. Cribb; Mark W. Chase; Finn N. Rasmussen (2001). Genera Orchidacearum: Volume 2. Orchidoideae. Oxford University Press. p. 14. ISBN 978-0-19-850710-9. (See External links below).
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^ Emmanuel J. P. Douzery, Alec M. Pridgeon, Paul Kores, H. P. Linder, Hubert Kurzweil, and Mark W. Chase. 1999. "Molecular phylogenetics of Diseae (Orchidaceae): a contribution from nuclear ribosomal ITS sequences". American Journal of Botany 86(6):887-899. PDF
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Disperis: Brief Summary
provided by wikipedia EN
Disperis is a genus of plants in the orchid family, Orchidaceae. It has about 78 species. Most of the species are from tropical and southern Africa, as well as Indian Ocean islands. A few are native to the tropical or the warmer subtropical regions of Asia and Malesia.
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