Gyrostemonaceae

Gyrostemon ramulosus, illustration.

The Gyrostemonaceae are a family in the order of Kreuzblütlerartigen ( Brassicales ). The 16 to 17 species are found in Australia, including Tasmania ( sort of) home.

  • 4.1 Notes and references

Description

Vegetative characteristics

They grow as shrubs, small trees or sometimes subshrubs that are xerophytes and often are a little succulent. The Secondary growth in thickness is based on a conventional Kambiumring. The stems and leaves are rubbery.

The alternate and spirally arranged leaves may be stalked or sitting and small to medium in size. The simple, often fleshy, herbaceous or leathery leaf blades are linear to lanceolate, lanceolate or ovate - inverted. The leaf blades are just have a sheet nerve or there is Fiedernervatur ago. There may be tiny stipules.

Generative features

The more or less radial symmetry flowers are inconspicuous and functionally unisexual, usually on separate plants ( dioecious ); rarer the species monoecious getrenntgeschlechtig ( monoecious ). The flowers appear singly or together in a terminal or pendent, racemose inflorescences or aged men. There are small bracts ( Brakteolen ) available. The perianth ( perianth ) consists of a circle with four or five fused, sepal -like ( sepalinen ) bloom cladding surrounding a broad fleshy, flat or convex base of the flower. The calyx is cup-shaped, lobed or entire. At this set to the 6-100 ( numerous ) stamens and the ovary. The stamens are mutually free and not fused with the bloom cladding. There are highest short stamens present. The anthers open with a longitudinal slot. The pollen grains have three apertures and are usually COLPAT. 5 to 25 carpels are partially fused to complete a superior ovaries. Per carpel there is a anatrope ovule. Pollination is by wind ( anemophily ).

The most initially fleshy carpels break radially in two to 25 -seeded fruits or part indehiscent fruits are available in a multiple fruit ( Synkarp ) together. The seeds have oily and a well-developed, curved embryo with two flat cotyledons ( cotyledons ).

Chromosome numbers and ingredients

The chromosome numbers be n = 14 or 15

In this family, the characteristic of the order of Brassicales glucosinolates are present.

Occurrence

The family is endemic in many areas of Australia, and is, with the exception of the monsoon -influenced North and South West Tasmania throughout the continent before. However, the species occur only in arid regions at heaped. Some species are "Fire opportunists " and colonize disturbed sites.

System

The Gyrostemonaceae family within the order of Kreuzblütlerartigen ( Brassicales ) the sister group of the Resedaceae.

In the family Gyrostemonaceae are four to five genera with 18-19 species:

  • Codonocarpus unn. ex Endl. With about three ways: Codonocarpus attenuatus ( Hook. ) H.Walter
  • Codonocarpus cotinifolius ( Desf. ) F.Muell.
  • Codonocarpus pyramidalis ( F.Muell. ) F.Muell.
  • Cypselocarpus haloragoides ( F.Muell ex Benth. ). F.Muell. Thrives on sandy soils in the coastal region of Western Australia.
  • Tersonia Moq:. With the only kind: Tersonia cyathiflora ( Fenzl ) ASGeorge ex JWGreen: It is a perennial, ephemeral plant, whose seeds survive several years in the seed bank and germinate only after a fire. This endemic species thrives on sandy soils north of Perth in Western Australia.
  • Walteranthus erectus Keighery: It grows on sand over limestone in the coastal region of Western Australia.

Documents

The article is based on the following links:

  • The Gyrostemonaceae on the APWebsite family. (Section Description and systematics)
  • Gyrostemonaceae in Flora of Australia online. (Section Description and systematics)
  • Gyrostemonaceae in L. Watson and M. J. Dallwitz (1992 onwards ): The families of flowering plants. ( Description section )
  • The Gyrostemonaceae in Flora of Tasmania Online family. (Section Description and systematics)
  • The Gyrostemonaceae at Western Australian Flora family. ( Description section )
  • The Gyrostemonaceae family in Flora of New South Wales Online. (Section Description and systematics)
Vascular cambium Ovary (botany) Compound fruit Cereal germ Desert climate
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