Homoranthus

Homoranthus flavescens

Homoranthus is a genus of flowering plants in the myrtle family ( Myrtaceae ). All about 31 species are originally found only in Australia.

  • 5.1 Notes and references

Description

Appearance and leaves

Homoranthus species grow as evergreen shrubs.

The opposite or decussate arranged on the branches of deciduous leaves are often narrowed laterally so that the leaf blades are thicker than broad, in the side view they are linear, terete to more or less upside - lanceolate.

Inflorescences, flowers and fruits

In the upper leaf axils of undifferentiated branches are reduced, kopfige inflorescences, containing one to four flowers. Each flower is about a pair of bracts, the fast transient or even during anthesis (as long as the flower is opened) are retained.

The hermaphrodite flowers are radial symmetry and fünfzählig double perianth. The flower cup ( hypanthium ) extending above the ovary and is usually fünfrippig. The sepals are fully grown or end in two to twelve slender fringed calyx lobes. The colors of the flowers are white or yellow to orange to red. The stamens are usually straight or rarely curved each few in the bud inside. Usually one or two, rarely more circuits five or six more or less the same stamens are arranged. Ten fertile stamens alternate with ten staminodes from. The spherical dust bag open at the top with pores. Two carpels are fused into a semi- permanent under, unilocular ovary. In basal placentation two or ten anatrope ovules are arranged. The outstanding conspicuously far from the perianth pen has a ring of hairs below the scar.

The dry indehiscent fruits are usually one-seeded, rarely two-seeded nut fruits. The fruit is surrounded by little enlarged flower cups.

Chromosome number

Chromosome numbers are, depending on the type 2n = 14, 16, 18 or 20,

Distribution and threat

The genus Homoranthus is widespread with about 31 species in the southern and eastern Australian mainland. The species occur in the states of Queensland, New South Wales and South Australia.

Homoranthus darwinioides, Homoranthus decumbens, Homoranthus lunatus, Homoranthus montanus, Homoranthus porteri and Homoranthus prolixus are classified as " Vulnerable " = " endangered". No other species is considered threatened.

System

The name comes from Allan Cunningham Homoranthus. The first publication of the valid genus Homoranthus was in 1836 by Johannes Conrad Schauer in the article genera Chamaelauciearum Nova quaedam in Linnaea, Volume 10, p 310 As Lectotypusart Homoranthus virgatus A.Cunn was. ex Schauer set. The genus name Homoranthus derives from the Greek words " be adjacent " homoros for or " adjacent " and anthos for " flower", this refers to the similarity of the flowers of the closely related genera such as Darwinia. The current revision of the genus Homoranthus comes from Lachlan M. Copeland, Lyn A. Craven & Jeremy J. Bruhl: A taxonomic review of Homoranthus ( Myrtaceae: Chamelaucieae ), In: Australian Systematic Botany, Volume 24, Issue 6, 2011, p 351-374.

Synonyms for Homoranthus A.Cunn. ex Schauer are: Darwinia sect. Homoranthus ( A.Cunn. Ex Schauer) Kuntze, Rylstonea RTBaker, Chamelaucium sect. Schuermannia F.Muell. , Darwinia sect. Schuermannia ( F.Muell. ) Benth., Schuermannia F.Muell. , Chamaelaucium sect. Schnermannia F.Muell. orth var.

The genus belongs to the tribe Homoranthus Chamelaucieae in the subfamily Myrtoideae within the family of Myrtaceae.

There are about 31 Homoranthus species ( as of 2011):

  • Homoranthus bebo L.M.Copel.
  • Homoranthus biflorus Craven & S.R.Jones
  • Homoranthus binghiensis J.T.Hunter
  • Homoranthus brevistylis L.M.Copel.
  • Homoranthus bruhlii L.M.Copel.
  • Homoranthus cernuus ( RTBaker ) Craven & SRJones
  • Homoranthus clarksonii L.M.Copel.
  • Homoranthus coracinus A.R.Bean
  • Homoranthus croftianus J.T.Hunter
  • Homoranthus cummingii L.M.Copel.
  • Homoranthus darwinioides ( Maiden & Betche ) Cheel
  • Homoranthus decasetus Byrnes
  • Homoranthus decumbens ( Byrnes ) Craven & S.R.Jones
  • Homoranthus elusus L.M.Copel.
  • Homoranthus flavescens shower
  • Homoranthus floydii Craven & S.R.Jones
  • Homoranthus homoranthoides ( F.Muell. ) Craven & SRJones
  • Homoranthus inopinatus LMCopel. , J.Holmes & G.Holmes
  • Homoranthus lunatus Craven & S.R.Jones
  • Homoranthus melanostictus Craven & S.R.Jones
  • Homoranthus montanus Craven & S.R.Jones
  • Homoranthus papillatus Byrnes
  • Homoranthus porteri ( CTWhite ) Craven & SRJones
  • Homoranthus prolixus Craven & SRJones ( Syn: Homoranthus bornhardtiensis JTHunter )
  • Homoranthus thomasii ( F.Muell. ) Craven & SRJones
  • Homoranthus tricolor A.R.Bean
  • Homoranthus tropicus Byrnes
  • Homoranthus vagans L.M.Copel.
  • Homoranthus virgatus A.Cunn. ex Schauer
  • Homoranthus Wilhelm II ( F.Muell. ) Cheel
  • Homoranthus zeteticorum Craven & S.R.Jones

Use

Homoranthus flavescens is used as an ornamental plant in subtropical parks and gardens.

Swell

  • Lachlan M. Copeland, Lyn A. Craven & Jeremy J. Bruhl: A taxonomic review of Homoranthus ( Myrtaceae: Chamelaucieae ), In: Australian Systematic Botany, Volume 24, Issue 6, December 21, 2011, p 351-374. doi: 10.1071/SB11015
  • G.J. Harden: Entry in the New South Wales Flora Online.
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