Decaisnea
| Decaisnea | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Decaisnea insignis , illustration |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Decaisnea | ||||||||||||
| Hook. f. & Thomson |
Decaisnea is a genus of plants belonging to the finger fruit family(Lardizabalaceae). It occurs in the mountain forests of East Asia (China, Himalaya).
description
Vegetative characteristics
Decaisnea species are summer-green, upright, sparsely branched shrubs . The winter buds are covered with two outer scales. The leaves are pinnate unpaired. The leaf stalks are articulated at the base, the partial leaf stalks are short, the partial leaves face each other.
Generative characteristics
Decaisnea species are single sexed ( monoecious ). The flowers are in terminal, paniculate , racemose inflorescences together.
The flowers have six sepals , usually overlapping like roof tiles, and no petals . The male flowers have six fused stamens with elongated anthers . The rudimentary pistil is small and has grown together with the stamen. In female flowers, the staminodes are free or are fused at the base. The three carpels are straight, the ovules stand in two rows on each side of the axially facing dividing line of the carpels. The scar is noticeable.
The fruit that pops up is straight or more or less curved. The seeds are surrounded by a white, translucent pulp and pressed in.
The number of chromosomes is 2n = 30.
Systematics
The genus Decaisnea was established in 1854 by Joseph Dalton Hooker and Thomas Thomson (botanists) . The generic name Decaisnea honors Joseph Decaisne (1807-1882), a Belgian-French botanist and agronomist (and the first editor of the Lardizabalaceae family). A synonym for Decaisnea Hook. f. & Thomson nom. Cons. is Slackia handle.
There are only two types:
- Blue cucumber ( Decaisnea fargesii Franch. ): It occurs in Nepal and China .
- Decaisnea insignis (Griff.) Hook. f. & Thomson : It occurs from the eastern Himalayas to northern Myanmar .
photos
blossoms
fruit
swell
- Dezhao Chen, Tatemi Shimizu: Lardizabalaceae. Decaisnea , p. 440 - the same text online as the printed work , In: Wu Zhengyi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China. Volume 6: Caryophyllaceae through Lardizabalaceae. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2001, ISBN 1-930723-05-9 .
- MJM Christenhusz: An overview of Lardizabalaceae. In: Curtis's Botanical Magazine , Volume 29, 2012, pp. 235-276.
Individual evidence
- ↑ Dezhao Chen, Tatemi Shimizu: Lardizabalaceae. Decaisnea , p. 440 - the same text online as the printed work , In: Wu Zhengyi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China. Volume 6: Caryophyllaceae through Lardizabalaceae. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2001, ISBN 1-930723-05-9 .
- ↑ a b c d Rafaël Govaerts (Ed.): Decaisnea. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved September 13, 2018.
- ^ Decaisnea in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved December 29, 2007.
