Thottea
| Thottea | ||||||||||||
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Thottea sivarajanii |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Thottea | ||||||||||||
| Rottbøll |
Thottea is a genus from the family of aristolochiaceae (Aristolochiaceae).
description
Thottea species are upright subshrubs, more rarely also shrubs. The leaves are alternate and have entire margins. The flowers are axillary and arranged in grapes, cymes, umbrella grapes or coils. The bracts are opposite in relation to the flowers. The inflorescence consists of a circle and is radially symmetrical. The calyx tips are fused. The calyx tube is bell-shaped, cup-shaped or urn-shaped. There is usually a thickened ring at its narrowing. The 3 or 4 calyx lobes touch without overlapping. The 8 or 9 stamens are arranged in a circle. There can be 6 to 36, rarely up to 46 stamens. These are arranged in one or two circles. Filaments are short or absent. They are not overgrown, partially overgrown or overgrown to the stylus, so that only the anthers are free. The anthers are bent outwards. The ovary is medium sized. The carpels are completely fused. The stylus are short and consist of 5 to 20 lobes. The scar is on the tip or side of the stylus. The fruits are pod-shaped. The seed coat is wrinkled or punctured transversely.
Occurrence
The genus Thottea occurs in India, Indonesia, Malaysia, Myanmar, the Philippines and Vietnam. The species Thottea hainanensis is endemic to China .
Systematics
Thottea was first described by Christian Friis Rottbøll in 1783 . It includes 25 species.
Here is a selection:
- Thottea grandiflora Rottb. : It occurs in Malaysia , Singapore, southern Thailand and southern Myanmar . The number of chromosomes is 2n = 26.
- Thottea hainanensis (Merrill & WY Chun) Ding Hou : It is found in thick forests on Hainan .
- Thottea siliquosa (Lam.) Ding Hou : It occurs in western India and Sri Lanka .
- Thottea sivarajanii E.SSKumar, AESKhan & Binu : It wasfirst describedin 2000 from the Indian state of Kerala .
Name declaration
The generic name Thottea honors Otto Graf von Thott (1703–1785), a Danish Minister of State who owned a large library.
literature
- Shumei Huang, Lawrence M. Kelly, Michael G. Gilbert: Thottea . In: Flora of China. Vol. 5 . 2003, p. 258 online (PDF; 74 kB)
Individual evidence
- ^ A b Thottea in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved June 6, 2018.
- ↑ Thottea grandiflora at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Shumei Huang, Lawrence M. Kelly & Michael G. Gilbert: Thottea Rottbøll - online with the same text as the printed work , In: Wu Zheng-yi, Peter H. Raven, Deyuan Hong (eds.): Flora of China. Volume 5: Aristolochiaceae. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2010
- ↑ Lotte Burkhardt: Directory of eponymous plant names . Botanic Garden and Botanical Museum Berlin, Free University Berlin Berlin 2016. ISBN 978-3-946292-10-4 . doi : 10.3372 / epolist2016 .
