Thryptomene
Thryptomene saxicola
Thryptomene is a genus of flowering plants in the myrtle family ( Myrtaceae ). All about 32 species are originally found only in Australia. Some varieties are mainly used as cut flowers.
- 5.1 Notes and references
Description
Appearance and leaves
Thryptomene species grow as evergreen shrubs that reach heights of growth of 0.3 to 1.5 meters. Only one species grows like a tree and reaches stature heights of up to 2.5 meters. They contain essential oils. The aboveground plant parts are bare.
The opposite ( or decussate ) arranged on the branches of leaves are at most short-stalked or sessile. The herbaceous or leathery, simple, tiny and relatively small leaf blades are ( especially visible on the lower leaf surface ) dotted with glandular and smell aromatic.
Inflorescences, flowers and pollination
The reduced inflorescences usually contain only one, rarely two or three flowers on very short to long Blütenstandsschäften in the leaf axils in the upper part of the branches. Each flower is about a pair of durable or fast transient cover sheets that can be fused with each other.
The relatively small, hermaphroditic flowers are usually radial symmetry and usually five, rarely sechszählig double perianth. The one with the ovary overgrown flower cup ( hypanthium ) is smooth, ribbed or wrinkled. The five or rarely six free sepals are kronblattartig and circular. The five or rarely six free petals are entire, elliptic, oval or circular and can be nailed. The colors of the petals are are white to pink. The stamens are usually straight or rarely curved slightly inwards in the bud. Usually one or two, rarely more circuits five or six more or less the same stamens are arranged. The stamens are all fertile; only Thryptomene maisonneuvei half is sometimes converted to staminodes. The thread-like stamens are inserted on the edge of the flower cup among themselves freely and not adherent to the petals. The look-alike dust bag open with longitudinal slots and not protrude beyond the petals. It is a discus available. Two carpels are fused into one under constant, unilocular ovary. In basal or lateral placentation two or four anatrope ovules are usually arranged. The style ends in a simple scar.
Pollination is by insects ( entomophily ) or birds ( Ornithophilie ).
Fruit and seeds
The dry indehiscent fruits are usually one-seeded, rarely two-seeded nut fruits. The ellipsoidal - kidney-shaped seeds contain a curved embryo with two seed leaves ( cotyledons ) and there is no endosperm present.
Chromosome number
The basic chromosome number is n = 11 In some species there is diploidy, ie 2n = 22; but it was also observed polyploidy different depending on the type sets of chromosomes.
Distribution and threat
The genus Thryptomene is widespread with about 32 species in Australia; Species occur in all federal states, including Tasmania. They occur in southern, central and northeastern Australia.
Only Thryptomene wittweri is known as " Vulnerable " = 'vulnerable '. No other species is regarded as endangered on the Australian mainland. In Tasmania Thryptomene micrantha is considered " Vulnerable " = " at risk " rating.
System
The genus Thryptomene was in 1840 by Stephan Ladislaus finite in the article Stirpium Australasicarum Herbarii Hugeliani Decades III - established in December 1838 in Annals of the Vienna Museum of Natural History, Volume 2, page 192. Type species is Thryptomene australis Endl .. The genus name is derived from the Greek word Thryptomene Thryptomene for " reduced " or " make small" is. This refers to the low habit of most species.
Synonyms for Thryptomene Endl. are: Thryptomene sect. Paryphantha ( Schauer) Kuntze, Paryphantha showers, Typtomene F.Muell. orth var, Tryptomene F.Muell. orth var, Thryptomene sect. Euthryptomene Kuntze, Thryptomene sect. Paryphantha ( Schauer) Stapf, Astraea showers, Bucheria Heynh. , Thryptomene sect. Astraea Stapf, Gomphotis Raf.
The genus belongs to the tribe Thryptomene Chamelaucieae in the subfamily Myrtoideae within the family of Myrtaceae.
There are about 32 species Thryptomene:
- Thryptomene australis Endl.
- Thryptomene baeckeacea F.Muell.
- Thryptomene biseriata J.W.Green
- Thryptomene calycina ( Lindl. ) Stapf
- Thryptomene costata Rye & Trudgen
- Thryptomene cuspidata ( Turcz. ) J.W.Green
- Thryptomene decussata ( W.Fitzg. ) J.W.Green
- Thryptomene denticulata ( F.Muell. ) Benth.
- Thryptomene duplicatà Rye & Trudgen
- Thryptomene elliottii F.Muell.
- Thryptomene eremaea Rye & Trudgen
- Thryptomene ericaea F.Muell.
- Thryptomene hexandra C.T.White
- Thryptomene hyporhytis Turcz.
- Thryptomene johnsonii F.Muell.
- Thryptomene kochii E.Pritz.
- Thryptomene longifolia J.W.Green
- Thryptomene micrantha Hook.f.
- Thryptomene mucronulata Turcz.
- Thryptomene naviculata J.W.Green
- Thryptomene nealensis J.W.Green
- Thryptomene oligandra F.Muell.
- Thryptomene parviflora ( Benth. ) Domin
- Thryptomene racemulosa Turcz.
- Thryptomene remota A.R.Bean
- Thryptomene salina Rye & Trudgen
- Thryptomene saxicola ( A.Cunn ex Hook. ). (Rarely called Kampferteestrauch, English:. Camphor tea shrub )
- Thryptomene stenophylla E.Pritz.
- Thryptomene striata Rye & Trudgen
- Thryptomene strongylophylla F.Muell. ex Benth.
- Thryptomene urceolaris F.Muell.
- Thryptomene wittweri J.W.Green
Use
From Thryptomene saxicola and Thryptomene calycina there are some varieties. They are grown throughout the world and used as cut flowers and are also in Central Europe in the flower trade. Thryptomene saxicola is used as an ornamental plant in parks and gardens.