Cistus GudangMovies21 Rebahinxxi LK21

      Cistus (from the Greek kistos) is a genus of flowering plants in the rockrose family Cistaceae, containing about 20 species (Ellul et al. 2002). They are perennial shrubs found on dry or rocky soils throughout the Mediterranean region, from Morocco, Spain, Italy, Greece, through to the Middle East, and also on the Canary Islands.
      Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower.
      The common name rockrose (rock rose in the UK) is applied to the species, a name also shared by the related genera Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.


      Description



      The leaves are evergreen, opposite, simple, usually slightly rough-surfaced, 2–8 cm long. In a few species (notably C. ladanifer), the leaves are coated with a highly aromatic resin called labdanum.
      They have showy 5-petaled flowers ranging from white to purple and dark pink, in a few species with a conspicuous dark red spot at the base of each petal.


      Taxonomy




      = Phylogeny

      =
      Cistus and Halimium form a cohesive and the most derived clade within Cistaceae. Plants of the World Online and World Flora Online treat Halimium as a synonym of Cistus. Molecular phylogenetic analyses conducted between 2005 and 2011 confirm that Cistus species divide into two well-defined clades, neither of which was fully resolved internally. The first clade consists of those with purple and pink flowers (the "purple pink clade" or PPC). The second clade consists of those with white flowers or, in the case of Cistus parviflorus, pale pink flowers (the "white or whitish pink clade" or WWPC). Although the flower colour of C. parviflorus is anomalous, it has very short styles, otherwise characteristic of WWPC species. A hybrid origin has been suggested. A simplified cladogram is shown below:

      Within the purple pink clade (PPC), C. crispus is consistently the first diverging species. C. albidus, C. creticus and C. heterophyllus form a well supported clade. Seven species endemic to the Canary Islands form a polytomy, resolved differently in different analyses, in which subtaxa of some species do not always cluster together. Within the white and whitish pink clade (WWPC), there is weak support for a clade consisting of C. clusii and C. munbyi; the other species either formed part of a polytomy or resolved differently in different analyses. Halimium and Cistus were regularly shown to be paraphyletic with respect to one another.


      = Species

      =
      The following species are recognised in the genus Cistus:


      = Gallery

      =

      Various species of Cistus






























      = Hybrids

      =
      In addition a large number of hybrids have been recorded, including:


      Ecology


      They are thermophilous plants, which require open, sunny places. This plant genus is peculiar in that it has developed a range of specific adaptations to resist summer drought and frequent disturbance events, such as fire and grazing. In addition, it can form both ectomycorrhizas and arbuscular mycorrhizas. More than 200 ectomycorrhiza-forming fungal species belonging to 40 genera have been reported so far to be associated with Cistus. As with many other Cistaceae, the species of Cistus have the ability to form mycorrhizal associations with truffles (Tuber) and are thus able to thrive on poor sandy soils or rocks. Cistus ladanifer has been found to have mycorrhizal associations with Boletus edulis, Boletus rhodoxanthus, and Laccaria laccata.
      Cistus are the only host of Cytinus hypocistis, a small parasitic plant that lives on the roots and is noticeable only for a short period of time when in flower. The presence of the parasite does not seem to harm the host population.
      Cistus species are used as food plants by the larvae of some Lepidoptera species including Coleophora confluella and Coleophora helianthemella, the latter recorded on Cistus monspeliensis.
      Various Cistus species are known to emit volatile oils, rendering the plants flammable. Their emission of these essential oils is a genetic adaptation for the species intended to actually promote flammability and even cause spontaneous combustion. Cistus plants are therefore considered pyrophytes, or plants which rely upon fire as a part of their life cycle to encourage spread within their biome. Cistus seeds are resistant to the fires allowing them to germinate once fires have subsided and allowing them to benefit from an environment with less competition from other species.


      Cultivation


      Cistuses are suitable for sunny gardens with a nearly frost-free Mediterranean climate. The hardiest of the species is C. laurifolius, which survived the hard frost at Royal Botanical Gardens at Kew in 1895 that eliminated all the cistuses save this and two white-flowered natural hybrids, C. × corbariensis, already grown by John Tradescant the Elder, and C. × loretii, a 19th-century introduction.


      = Cultivars

      =
      Cultivars (those marked agm have gained the Royal Horticultural Society's Award of Garden Merit) include:


      = Gallery

      =

      Various hybrids and cultivars


















      References




      Bibliography


      Demoly, J.-P. (2006). "Notes taxonomiques, chorologiques et nouveautes nomenclaturales pour le genre Cistus L. elargi, incluant Halimium (Dunal) Spach (Cistaceae)". Acta Botanica Gallica. 153 (3): 309–323. Proposes merging Cistus and Halimium.
      Demoly, J.-P. & Montserrat, P. (1993). "Cistus" (PDF). In Castroviejo, S.; Aedo, C.; Cirujano, S.; Lainz, M.; Montserrat, P.; Morales, R.; Munoz Garmendia, F.; Navarro, C.; Paiva, J.; Soriano, C. & Fernandez Arias, M.I. (eds.). Flora Iberica : Plantas vasculares de la Península Ibérica e Islas Baleares. Vol. 3. Madrid: Real Jardín Botánico, CSIC. pp. 319–337. ISBN 978-84-00-07375-6. Retrieved 2015-03-19.
      Ellul, P.; Boscaiu, M.; Vicente, O.; Moreno, V. & Rossello, J.A. (2002). "Intra- and Interspecific Variation in DNA Content in Cistus (Cistaceae)". Annals of Botany. 90 (3): 345–351. doi:10.1093/aob/mcf194. PMC 4240394. PMID 12234146.
      Page, R.G. (n.d.) [2002 onwards]. "The Cistus & Halimium Website". Retrieved 2015-03-01.
      Sweet, Robert (1825–1830). Cistineae : the natural order of Cistus or Rock-rose. London: James Ridgeway. Retrieved 2015-03-15.
      Warburg, E.F. (1968). "Cistus". In Tutin, T.G.; Heywood, V.H.; Burges, N.A.; Valentine, D.H.; Walters, S.M. & Webb, D.A. (eds.). Flora Europaea, Volume 2: Rosaceae to Umbelliferae. Cambridge University Press. pp. 282–284. ISBN 978-0-521-06662-4.


      External links

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    Cistus - Wikipedia

    Cistus (from the Greek kistos) is a genus of flowering plants in the rockrose family Cistaceae, containing about 20 species (Ellul et al. 2002). They are perennial shrubs found on dry or rocky soils throughout the Mediterranean region, from Morocco, Spain, Italy, Greece, through to the Middle East, and also on the Canary Islands.

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