Rhabdodendron

Rhabdodendron is the only genus of the family of Rhabdodendraceae in the order of the clove -like ( Caryophyllales ) within the angiosperms. The areas of about three Rhabdodendron species are produced in Latin America: in northern Brazil, French Guiana, Suriname and Guyana.

  • 3.1 Notes and references

Description

Vegetative characteristics

Rhabdodendron species are evergreen, small trees or large shrubs. The sieve tube plastids are P-type. There are short -stalked, fringed, shield -shaped hairs ( trichomes ) are present.

The alternate arranged on the branches of deciduous leaves are very large and broad -stalked. The simple and leathery leaf blade has a smooth, recurved leaf margin and a blurry dotted leaf surface. Stipules are not available or fall off early.

Inflorescences and flowers

Page Constantly branched inflorescences total of zymöse or racemose partial inflorescences are formed. Hub and shroud leaves are reduced to small or shed.

The hermaphroditic, flowers are radial symmetry fünfzählig with double perianth. The flower cup ( hypanthium ) is short, broad and slightly concave. The five short sepals are more or less grown strong. The five petals are sepal similar, relatively thick and usually fall off early. In more or less three circles are 25 to 50 free, fertile stamens with short, flat filaments and long anthers; the stamens still retained when the dust bag drop. The three-cell pollen grains usually have three, rarely four apertures and are colporat. It is only a spherical, constant upper carpel available with usually only a basal, campylotropen, unitegmischen ovule. The outgoing from the base of one side of the carpel, long, rather thick style ends in a highly elongated scar.

Fruit and seeds

The stone fruit is surrounded by the calyx and a swollen upper part of the stem and fruit contains a seed. The seed is kidney - to spherical. The well-developed embryo, green is curved with two large, thick, fleshy cotyledons ( cotyledons ).

Ingredients and sets of chromosomes

They contain ellagic acid. The sieve tube plastid - containing crystalloid proteins and starch. Lysigene secretion container containing resins. Cells contain silicate body.

The chromosome rates are n = 10

System

The first description was in 1853 as Lecostomon by Richard Spruce in George Bentham: Hooker's Journal of Botany and Kew Garden Miscellany, Volume 5, page 296 The genus name Rhabdodendron in 1905 by Ernest Friedrich Gilg and Robert Knud Friedrich pilgrims in negotiations of the Botanical Society of the Brandenburg province and the adjacent countries, vol 47, p 152 published. Previously, the genus Rhabdodendron was at the Rosales or Rutales ( Takhtajan 1997) in the families Chrysobalanaceae, Phytolaccaceae or Rutaceae classified. There was a tribe Rhabdodendron Huber in Boletim do Museu Emilio Goeldi Paraense, 5, 1909, 425 or Unterfamalie Rhabdodendroideae in Engler & Prantl Engl: The natural plant families ..., 2nd edition, volume 19 a, 1931, p 213 -357 erected. The Rhabdodendraceae family was erected by Ghillean Tolmie Prance in Bulletin du Jardin botanique de l' État à Bruxelles, 38, pp. 141-142 1968. The position of the Rhabdodendraceae within the cladogram of the order of Caryophyllales is still under discussion.

The Rhabdodendraceae family contains only one genus Rhabdodendron with three (two to four) types:

  • Rhabdodendron amazonicum Spruce ex Benth. Huber ( Syn: Lecostemon amazonicum Spruce ex Benth. ): This small tree reaches a height of maximum 15 meters and is often in the rain forest of the " Terra Firme " of the Amazon basin in the Manaus region eastwards to Para- Maranhao - border and northward to the three Guyana States.
  • Rhabdodendron crassipes (. Spruce ex Benth ) Huber ( Syn: Lecostemon crassipes Spruce ex Benth. )
  • Rhabdodendron macrophyllum ( Spruce ex Benth. ) Huber ( Syn: Lecostemon macrophyllum Spruce ex Benth. ): This up to 3 meters Height -reach shrub is often only in the white sand areas in the vicinity of Manaus and east of the river Trombetas.

Swell

  • The Rhabdodendraceae in APWebsite family. (Sections systematics and description)
  • The Rhabdodendraceae at DELTA by L. Watson & MJ Dallwitz family. (Sections systematics and description)
  • Ghillean T. Prance: Flora da Reserva Ducke: Amazonas, Brasil: Rhabdodendraceae in Rodriguésia, 56 (86 ), 2005, 183-185: PDF Online. (Sections systematics and description)
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