Deuterocohnia

Deuterocohnia lorentziana with long -tube, green flowers.

Deuterocohnia is a plant genus in the subfamily Pitcairnioideae within the family Bromeliaceae ( Bromeliaceae ). The approximately 19 species occur in the South American Andes.

Description

The Deuterocohnia species are perennial, terrestrial or rarely lithophytic living xerophytes. They form strong, sprossbürtige roots. The stemless clump -forming plants grow by Kindel. The often thick, succulent leaves are in a basal, dense rosette. The rosettes of species that have been assigned to the genus Abromeitiella earlier, have only diameter and plant height of several centimeters; they make great pads. The types according to the old, smaller circumference of the genus Deuterocohnia form rosettes of about 1 meter in diameter. The rigid leaves terminate in a sharp point. At least the lower leaf surface has white scales ( trichomes ). The leaf margins are thorny sawn, with a very different depending on the type large thorns.

The inflorescences in some woody species and form over several years flowers - an exception in the family of Bromeliaceae. The simple or compound from aged men part inflorescences inflorescences are depending on only a few centimeters (ie compressed ) to more than 1 m ( with long Blütenstandsschäften ) high. The radial symmetry, the threefold flowers are hermaphrodite with double perianth. There are three sepals present. The three free petals are yellow to green, rarely up red. There are two circles, each with three free, fertile stamens present. Three carpels are fused into a superior ovaries.

Are formed dreifächerige capsule fruits that contain many winged seeds. The seed dispersal is carried by the wind.

Occurrence

The distribution of Deuterocohnia species is the South American Andes. Centers of distribution are the Andes in Peru, Chile, southern Bolivia and northern Argentina. They thrive on low rainfall and intense radiation slopes and dry valleys ( arid climate ).

System

The genus Deuterocohnia was erected in 1894 by Carl Christian Mez in the Flora Brasiliensis. The genus name honors the German botanist Ferdinand Julius Cohn and microbiologist ( 1828-1898 ). It was a genus Cohnia present, by the Greek prefix deuteros for " second ", a new name was formed ( Cohnia Kunth synonym of Cordyline Comm. R.Br. ex and Cohnia Rchb f. Synonym of Oncidium Sw. ).

In the generic monograph by Smith & Downs (1974-1979) seven species are listed. By Spencer & Smith ( 1992) the species of the genus Abromeitiella Deuterocohnia have been assigned. The systematics of this group has been controversial, a German research project this ended in 2009 and confirmed the merger of the two genera.

Today includes about 19 species in the genus Deuterocohnia:

  • Deuterocohnia bracteosa W.Till & L.Hromadnik
  • Deuterocohnia brevifolia ( Grisebach ) MASpencer & LBSmith
  • Deuterocohnia brevispicata Rauh & L.Hromadnik
  • Deuterocohnia carmineoviridiflora ( roughness ) Gouda ( Syn: Deuterocohnia meziana var carmineoviridiflora roughness ): You got in the bromeliad 2012, Issue 3, pp. 115-117 the rank of a species and is native to Paraguay.
  • Deuterocohnia chrysantha ( Philippi ) Mez
  • Deuterocohnia digitata L.B.Smith
  • Deuterocohnia gableana R.Vásquez & P.L.Ibisch
  • Deuterocohnia glandulosa E.Gross
  • Deuterocohnia haumanii A.Castellanos
  • Deuterocohnia longipetala ( Baker) Mez
  • Deuterocohnia lorentziana ( Mez ) & MASpencer LBSmith
  • Deuterocohnia lotteae ( roughness ) MASpencer & LBSmith
  • Deuterocohnia meziana Kuntze ex Mez
  • Deuterocohnia pedicellata W.Till: it was released in 2005 and comes only at altitudes of about 1200 meters before only in the Bolivian department of Chuquisaca.
  • Deuterocohnia recurvipetala E.Gross
  • Deuterocohnia scapigera ( Rauh & L.Hromadnik ) MASpencer & LBSmith: Deuterocohnia scapigera subsp. sanctae - crucis R.Vásquez & P.L.Ibisch
  • Deuterocohnia scapigera ( Rauh & L.Hromadnik ) MASpencer & LBSmith subsp. scapigera
  • Deuterocohnia strobilifera var inermis L.B.Smith
  • Deuterocohnia strobilifera Mez var strobilifera

Pictures

Deuterocohnia meziana with large rosettes and long inflorescences, where for several years flowers are formed:

Detail of inflorescence.

Deuterocohnia brevifolia syn: Abromeitiella brevifolia, cushion forming species with compressed inflorescences:

Cushion.

After the flowering period with clearly identifiable withered flowers in compressed inflorescences.

Individual plants with scaly leaves.

Swell

  • Werner Rauh: Bromeliads - Tillandsias and other cultural worthy bromeliads, Verlag Eugen Ulmer, Stuttgart 1990, ISBN 3-8001-6371-3
  • Harry E. Luther: An Alphabetical List of Bromeliad Binomials, 2008 in The Marie Selby Botanical Gardens, Sarasota, Florida, USA. Published by The Bromeliad Society International. (PDF file, 314 kB)
  • Jason R. Grant, 1998: About the names of the genera of the Bromeliaceae.
  • MA Spencer & LB Smith: A revision of the genus Deuterocohnia Mez ( Bromeliaceae: Pitcairnioideae ) in Bradea, Volume 6, 16, pp. 141-146, 1992.
  • Ralf Horres: Dissertation, 2003: Studies on the systematics and phylogeny of the Bromeliaceae, with particular consideration of molecular features: Deuterocohnia pp. 22-23: Online. (PDF, 2.5 MB)
  • In "Species Index " on Deuterocohnia click on Eric J. Gouda, Gouda Derek Butcher & Kees: Encyclopaedia of Bromeliads, Version 3.1 ( 2012). last seen on August 24, 2013 ( section systematics with distribution of the species. )
  • Nicole Schütz: Systematics and evolution of the genus Deuterocohnia Mez ( Bromeliaceae ), Dissertation, 2013 at the University of Kassel. Abstract.
Perennial plant Lithophyte Ovary (botany) Desert climate Chuquisaca Department
232776
de