Corsiaceae
The Corsiaceae are a plant family of the order of the lily -like ( Liliales ). It contains three genera with 25 species.
Description
Corsiaceae are herbaceous plants with rhizomes or tuber -like roots as outlasting. The above-ground parts of plants are unbranched. The three to seven alternate arranged, ovate leaves are reduced to scales leaves, three to seven annoying and up to 5 inches long. Stipules absent.
The solitary, threefold, terminal flowers are zygomorphic. In Corsia style, stigma and anthers are fused to a gynostemium. Except for the monoecious getrenntgeschlechtige ( monoecious ) Type Corsiopsis chinensis the monotypic genus Corsiopsis all species have hermaphroditic and protandrous flowers pronounced. The six single or three annoying bloom are free to stand in two circles and are shaped differently. A perianth of the outer circle is larger than the others and is (similar to orchids) formed as a labellum, which is provided in Corsia species at the base with a characteristic callus. There are two circles, each with three fertile stamens present. Three carpels are fused into one inferior ovary, with a stylus and three scars.
Are formed capsule fruits that contain about 25 to 100 seeds. The tiny, winged seeds are longitudinally furrowed and are likely to spread by the wind ( Anemochorie ).
All species of the family have abandoned photosynthesis and accordingly form no chlorophyll, instead they live myco -heterotrophic. My xylem is not perforated.
Distribution area
The genus is native to New Guinea Corsia, but occasionally radiates out to the Solomon Islands, the Bismarck Archipelago and Queensland. Arachnoiditis is found in South America and the Falkland Islands, Corsiopsis in southern China. The majority of Corsiaceae lives in humid, hot conditions in rich soils, shaded by dense vegetation.
System
The family includes three genera, two of which are monotypic:
- Arachnitis Phil, with a kind: Arachnitis uniflora Phil
- Corsiopsis chinensis D.X. Zhang, R.M.K. Saunders & C. M. ugh
The Corsiaceae were indeed suggested by Beccari, the genera but were asked to Burmanniaceae long, only worse, they separated again from 1905 as a separate family. However, molecular genetic studies have shown that the Corsiaceae are polyphyletic. Although lay of Corsiopsis no data to arachnoiditis and Corsia, however, are consequently not even closely related. The Corsia are therefore Campynema close and Arachnitis the Thismiaceae and further the Burmanniaceae.
Evidence
- R. Govaerts: World Checklist of Corsiaceae. The Board of Trustees of the Royal Botanic Gardens, Kew, 2006 http://www.kew.org/wcsp/ the 4 December 2006 11:20
- Paula J. Rudall, Alison Eastman: The questionable affinities of Corsia ( Corsiaceae ): evidence from floral anatomy and pollen morphology. In: Botanical Journal of the Linnean Society. Volume 138, 2002, pp. 315-324
- Dianxiang Zhang, Richard MK Saunders, Chi -Ming Hu: Corsiopsis chinensis Gen. et sp. nov. ( Corsiaceae ): First Record of the Family in Asia. In: Systematic Botany. Volume 24, No. 3 (Jul. - languages., 1999), pp. 311-314, (Abstract Online)
- Ray Neyland, Melissa Hennigan: A phylogenetic analysis of large- subunit ( 26S ) ribosome DNA sequences Suggests did the Corsiaceae are polyphyletic. In: New Zealand Journal of Botany. 2003, Volume 41, pp. 1-11 (PDF online )
- Aaron Goldberg: Character variation in Angiosperm Families. In: Contributions from the United States National Herbarium. Volume 47, 185 pp. ( pp. 120, 128, 132, 140, 177), Washington DC, 2003.
- C. Neinhuis, P. Ibisch: Corsiaceae. In: Klaus Kubitzki (ed.): The Families and Genera of Vascular Plants. Volume 3: Flowering Plants, Monocotyledons, Lilianae (except Orchidaceae), Springer, Berlin / Heidelberg / New York 1998, ISBN 3-540-64060-6, pp. 198-201. .