Micromyrtus
Micromyrtus blakelyi in its natural habitat in Muogamarra Nature Reserve, New South Wales, Australia
Micromyrtus is a genus of flowering plants in the myrtle family ( Myrtaceae ). All up to 44 species are native only in Australia, where they are called " Heath- myrtles ."
- 4.1 Notes and references
Description
Appearance and leaves
Micromyrtus species grow as a spreading to erect, evergreen shrubs that reach heights of growth of usually 0.4 to 1 ( 0.3 to 2 ) 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, leaf blades are relatively small ( particularly well seen on the lower leaf surface ) dotted with glandular and smell aromatic. There are no stipules present.
Inflorescences, flowers and pollination
The reduced inflorescences usually contain only one, rarely two or three flowers at most very short Blütenstandsschäften in the leaf axils in the upper part of the branches. Each flower is more durable or fast transient bracts on a pair.
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 ribbed or grained. The five or rarely six free, small sepals are membranous or kronblattartig with smooth or fringed edge. The five or rarely six free petals are entire, elliptic, oval or circular and can be nailed. The colors of the petals are are yellow or white to pink. The stamens are usually straight or rarely curved each few in the bud inside. Mostly one or two groups each of five or six, more or less the same stamens are arranged. The stamens are all fertile. The thread-like or belt-like stamens are mutually free and not fused with 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 to lateral placentation two or ten anatrope ovules are arranged. The style ends in a simple scar that does not extend beyond the bloom.
Pollination is by insects ( entomophily ) or birds ( Ornithophilie ).
Fruit and seeds
The dry indehiscent fruits are usually one-seeded, rarely two to dreisamige nut fruits. The ellipsoidal to reniform 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 found tetraploidy.
Distribution and threat
The genus is widespread Micromyrtus with up to 44 species in the southern, central and northeastern Australia. Species occur in the states of Western Australia, South Australia, Northern Territory, Queensland, New South Wales, Victoria and Australian Capital Territory.
Micromyrtus grandis is known as " Endangered " = " high risk " rating. Micromyrtus blakelyi and Micromyrtus minutiflora are classified as " Vulnerable " = " endangered".
System
The genus Micromyrtus in 1865 by George Bentham in Bentham G. & JDHooker: Genera Plantarum erected, 1, p 700. Lectotypusart is Micromyrtus drummondii Benth. nom. Superfl. , this is now a synonym of Micromyrtus obovata ( Turcz. ) JWGreen. The genus name Micromyrtus is composed of the Greek word for micro "small" and myrtus, ie a genus of the Myrtaceae family, together. The last partial revision of the genus Micromyrtus was in BL Rye: A partial revision of the south - western Australian species of Micromyrtus ( Myrtaceae: Chamelaucieae ) In: Nuytsia, Volume 16, Issue 1, 2006, pp. 121-122.
The genus belongs to the tribe Micromyrtus Chamelaucieae in the subfamily Myrtoideae within the family of Myrtaceae.
There are up to 44 Micromyrtus types:
- Micromyrtus acuta Rye
- Micromyrtus albicans A.R.Bean
- Micromyrtus barbata J.W.Green
- Micromyrtus blakelyi J.W.Green
- Micromyrtus Capricornia A.R.Bean
- Micromyrtus carinata A.R.Bean
- Micromyrtus chrysodema Rye
- Micromyrtus ciliata (Sm. ) Druce
- Micromyrtus clavata J.W.Green ex Rye
- Micromyrtus delicata A.R.Bean
- Micromyrtus elobata ( F.Muell. ) Benth.
- Micromyrtus erichsenii Hemsl.
- Micromyrtus fimbrisepala J.W.Green
- Micromyrtus flaviflora ( F.Muell. ) J.M.Black
- Micromyrtus forsteri A.R.Bean
- Micromyrtus gracilis A.R.Bean
- Micromyrtus grandis J.T.Hunter
- Micromyrtus hexamera ( Maiden & Betche ) Maiden & Betche
- Micromyrtus hymenonema ( F.Muell. ) C.A.Gardner
- Micromyrtus imbricata Benth.
- Micromyrtus leptocalyx ( F.Muell. ) Benth.
- Micromyrtus littoralis A.R.Bean
- Micromyrtus minutiflora Benth.
- Micromyrtus mono taxis Rye
- Micromyrtus navicularis Rye
- Micromyrtus ninghanensis Rye
- Micromyrtus obovata ( Turcz. ) J.W.Green
- Micromyrtus papillosa J.W.Green ex Rye
- Micromyrtus patula A.R.Bean
- Micromyrtus placoides Rye
- Micromyrtus racemosa Benth.
- Micromyrtus Redita Rye
- Micromyrtus rogeri J.W.Green ex Rye
- Micromyrtus rotundifolia A.R.Bean
- Micromyrtus serrulata J.W.Green
- Micromyrtus sessilis J.W.Green
- Micromyrtus stenocalyx ( F.Muell. ) J.W.Green
- Micromyrtus striata J.W.Green
- Micromyrtus sulphurea W.Fitzg.
- Micromyrtus triptychs Rye
- Micromyrtus trudgenii Rye
- Micromyrtus uniovula Rye
- Micromyrtus vernicosa A.R.Bean