Dendrobium polysema

Dendrobium polysema

Dendrobium polysema                                                                                                                                                    photo C. Solimbergo
taxonomy         described by Schlechter, Friedrich Richard Rudolf
  published in     Die Flora der Deutschen Schutzgebiete in der Südsee  163    1906
  family Orchidaceae
  subfamily Epidendroideae
  tribe Malaxideae
  subtribe Dendrobiinae
  genus Dendrobium Swartz 1799
  chromosomes  2n = 38  

CAM pathway, stomata of the leaves are open at night.

    (K.Silvera, L.S. Santiago, J.C. Cushman, K. Winter - International Symposium on Plant Biology, August 2013)
    it is useful give the soluble mineal nutriens, on the roots.
native of origins rain forests, in Papua (Bismark Range, Wau, Marobe, Northern Province, Highlands),
    Islands of Solomon (Terai Ise, Guadalcanal, Santa Ysabel), Vanuatu (Sanma, Espirito Santo, Pentecost),
    Santa Cruz and Bouganville
  altitude Papua 1200 - 1900 m  ( 3960 - 6270 ft)  - Pacific Islands  150- 700 m  (495 - 2310 ft)

climate informations from Bulolo (Morobe, Papua)

    Köppen climate classification : Af, humid tropical climate of the rainforest
    (no winter season, more abundant rainfall)
    the weather station data (temperatures are calculated for an altitude of 400 m / 1320 ft) :
    Dendrobium polysema a gr uk
  photoperiod in Bulolo this orchid bloom with a photoperiod, that varies during the year, from 12 h 28 m' to 11 h 32 m'
  life form epiphyte
  brightness     partial shade  
inflorescence     length 22 - 30 cm (8.8" - 12"), apical  
  nr flowers 16 - 22
  size single flower 4 L 4 cm (1.6" L 1.6") - inflorescence 22 L 11 cm (8.8" L 4.4")
  duration inflorescence lengt 80 days
  time to bloom from birth, ≈ 60 days  
CITES appendix II


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