Rhoiptelea

Rhoiptelea chiliantha is the only species of the genus in the family Rhoiptelea walnut family ( Juglandaceae ). The English common name is " Horsetail tree". The fine wood is used for making furniture and equipment.

Description

Rhoiptelea chiliantha is reached of about 60 cm a deciduous tree, the growth heights of up to 20 meters and trunk diameter. They contain resins and essential oils. The bark of young branches, stipules, petioles, and inflorescences are densely covered with yellow glands and hair. The alternate arranged, petiolate, aromatic scented leaves are imparipinnate with (7 to ) 9 to 11 ( to 13) serrate leaflets. The petiole is 3 to 4 cm in length, the sheet is without a handle 15 to 30 ( to 40) inches long. Small asymmetric stipules have a length of 3 to 6 mm.

The inflorescences are composed of dreiblütigen partial inflorescences, hanging catkins, about 15 to 30 ( to 38) cm long. There are hermaphroditic and sterile female, small, radiärsymmetrische flowers. The perianth consists of only four equally diverse, small bloom cladding. There are six free, fertile stamens with short stamens present. Two carpels to a superior ovaries grow together. The two pens are free. Pollination is about the wind ( anemophily ). The flowering period extends from October to January.

It is made with a maturity (July to August), brownish yellow, vierrippige nut, which is 5-8 mm wide with two membranous wings. The elliptical seeds are about 2 mm in size. The two cotyledons are thick and oily.

Occurrence

The distribution is subtropical to tropical: from southern China (northern and western Guangxi, southern Guizhou and southeastern Yunnan ) to northern Vietnam. There, this species grows on slopes, in valleys and in gallery forests of the rivers at altitudes 700-2500 m. In Vietnam, this species is considered endangered.

Fossil pollen finds there are also from North America.

System

The research resulted in the genre for a time as his own family Rhoipteleaceae. The Angiosperm Phylogeny Group united them again but with the walnut family ( Juglandaceae ).

Swell

  • The Rhoipteleaceae in APWebsite family. (English)
  • The Rhoipteleaceae at DELTA family. (English)
  • Liguo Fu, Xin Yiqun, Bruce Bartholomew: Rhoipteleaceae, Rhoiptelea chiliantha. In: Wu Zhengyi, Peter H. Raven, Deyuan Hong (eds.): Flora of China. Volume 5: Ulmaceae through Basellaceae, Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2003, ISBN 1-930723 X -27, p.20, PDF file ( in English).
  • Robert Hegnauer: chemotaxonomy of plants. An overview of the distribution and systematic significance of plant materials. Volume 6: Dicotyledoneae: Rafflesiaceae - Zygophyllaceae, Birkhäuser, Basel 1973, ISBN 3- 7643-0667 -X, pp. 82, limited preview on Google Book Search.
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