Cayratia

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Cayratia
Cayratia japonica

Cayratia japonica

Systematics
Nuclear eudicotyledons
Rosids
Order : Grapevine-like (vitales)
Family : Grapevines (Vitaceae)
Subfamily : Vitoideae
Genre : Cayratia
Scientific name
Cayratia
Yuss.

Cayratia is a genus of plants within the grapevine family(Vitaceae). The 45 to 60 species arewidespreadin the Old World .

description

Habit, shoot axis, shoot tendrils and leaves of Cayratia acris
Cayratia corniculata leaves split in a foot-shaped manner
Inflorescence of Cayratia japonica
Inflorescence of Cayratia clematidea

Appearance and leaves

In cayratia TYPES rarely are perennial herbaceous plants or mostly little to more woody plants that independently upright as shrubs or climbing as lianas grow. They can be evergreen or deciduous. The shoot tendrils opposite the leaves are branched with two, three or more bifurcations and their ends sometimes have adhesive discs.

There are cayratia species with heterophyllia . The alternate and two lines or spirally arranged on the stem axis leaves are usually divided into petiole and leaf blade. Depending on the species, the leaf blade is divided into three to nine hands or pinnate in the shape of a foot. In the case of hand-shaped spreaders, the lateral leaf sections are often smaller than the end sections. The leaf margins are notched or serrated. The leaf surfaces are often dotted with glands. The nerves are mostly hand-nerved, rarely pinnate, and the network nerves can also be recognizable. The stipules fall off early.

Inflorescences and flowers

Cayratia species are either polygamous-monoecious , but mostly monoecious, separate sexes ( monoecious ), so the flowers of both sexes are on one specimen, but sometimes hermaphroditic flowers are also found; or all flowers are hermaphroditic. The lateral, mostly on a long inflorescence stem, zymous inflorescences are compound dichasias or polychasias and usually contain many flowers. There are bracts , bracts and flower stalks.

The relatively small flowers are fourfold and radial symmetry with a double flower envelope . The four bare sepals are cup-shaped over mostly their entire length and calyx teeth are at most very short. The four free, spread out petals can be somewhat hood-shaped at the top and fall off individually. The well-developed, cup-shaped disc has a wavy or slightly four-lobed edge and is fused with the base of the ovary. There is only the inner circle of the stamen with four fertile, identical, free stamens . The two carpels are an above-permanent, two-chambered ovary grown. There are only two ovules per ovary chamber . The short, pencil-shaped stylus ends in a relatively small scar, which can enlarge somewhat after the anthesis .

Fruits and seeds

The more or less spherical berries are fleshy and usually contain only one to four seeds. The seeds are triangular to ovoid. The oil-containing endosperm is almost circular or T-shaped in cross section. The straight embryo has two germ layers ( cotyledons ).

Systematics and distribution

The first publication of cayratia was carried out in 1818 by de Antoine-Laurent Jussieu in F. Cuvier: Dictionnaire des Sciences Naturelles , 2nd Edition, Volume 10, p 103. Type species is cayratia pedata (Lour.) Juss. Cayratia Juss. nom. cons. is preserved in accordance with the ICBN rules (Vienna ICBN Art. 14.4 & App. III) compared to Lagenula Lour. nom. rej. A synonym for Cayratia Juss. is Columella Lour. According to Genaust (1996), the origin of the generic name Cayratia is unclear.

The genus Cayratia belongs to the subfamily Vitoideae within the Vitaceae family. Cayratia pedata

The wide natural range of the genus Cayratia includes Asia and Australia , New Caledonia , Africa , Madagascar , Malesia and Oceania . There are 17 species in China, nine of them only there. About eight species are native to Australia, five of them only there.

There are 45 to 60 Cayratia species, here the species found in China, Madagascar and Australia:

use

In some African countries, the leaves of Cayratia gracilis in particular are usually eaten cooked, and subterranean parts of the plant are more rarely used as food.

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Individual evidence

  1. ^ A b c d e f C. Gardner, TA James: Cayratia in the New South Wales Flora Online .
  2. a b c d e f g h i j k l m n o p q r s t u v Hui Ren, Jun Wen: Cayratia , p. 189 - online with the same text as the printed work , In: Wu Zheng-yi, Peter H Raven & Deyuan Hong (Eds.): Flora of China , Volume 12 - Hippocastanaceae through Theaceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2007, ISBN 978-1-930723-64-1 .
  3. a b c d e HR Coleman, 2008: Entry in the Western Australian Flora .
  4. ^ Anna Trias-Blasi, John AN Parnell & Trevor R. Hodkinson: Multi-gene Region Phylogenetic Analysis of the Grape Family (Vitaceae) , In: Systematic Botany , Volume 37, Issue 4, 2012, pp. 941-950. doi : 10.1600 / 036364412X656437
  5. Cayratia at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed July 7, 2013.
  6. ^ A b c Cayratia in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved March 1, 2017.
  7. Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Birkhäuser, Basel / Boston / Berlin 1996, ISBN 3-7643-2390-6 Google-Book. .
  8. Enter the taxon in the search mask for Australian Plant Name Index = APNI. ( Memento of the original from August 11, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  @1@ 2Template: Webachiv / IABot / www.anbg.gov.au
  9. a b c Cayratia in the Madagascar Catalog .
  10. Gerardus JH Grubben (Ed.): Vegetables in Plant resources of tropical Africa , Volume 2, PROTA-Verlag, 2004. ISBN 978-90-5782-147-9 : Google-Books-online. , Cayratia species therein, pages 166–167.

further reading

  • Maurizio Rossettoac, Betsy R. Jackesb, Kirsten D. Scotta, Robert J. Henry: Is the genus Cissus (Vitaceae) monophyletic? Evidence from plastid and nuclear ribosomal DNA. In: Systematic Botany , 27, Issue 3, 2002, pp. 522-533. on-line.

Web links

Commons : Cayratia  - collection of images, videos and audio files