Paphiopedilum gratrixianum

Paphiopedilum gratrixianum

Paphiopedilum gratrixianum       
                                                                                                                                  photo C. Solimbergo
     
taxonomy described by (Masters)  Rolfe, Robert Allen
  published in       Orchid Review  13 : 63    1905
     
  family Orchidaceae
  subfamily Cypripedioideae
  tribe --
  subtribe --
  genus Paphiopedilum  Pfitzer 1886
  section Paphiopedilum  (Karasawa & Saito) Atwood 1984 
     
  chromosomes 2n = 26
  metabolism 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 primary cloud  forests in  Laos (Ban Pak Song), China (Yunnan, Ma Li Po)
  altitude 950 - 1000 m  (3135 - 3300 ft)
  habitat climate informations from Ban Pak Song (Champasak, Bolaven Plateau, Laos) 
    Köppen climate classification : Aw, tropical savanna climate  (with a dry season and a rainy season)
    the weather station data (temperatures are calculated for an altitude of 1000 m / 3300 ft) :
    Paphiopedilum gratrixianum b gr uk
  photoperiod  in Ban Pack Song this orchid blooms with a photoperiod, which varies during the year, from 13 h 00 m' to 11 h 00 m'
  life form geophyte, on silicate or granite soil, in moss
    bloom induction with december rest for six weeks and temperature of 5° - 8° (40° - 45°) (Lance A. Birk)
  brightness    partial shade to low
     
inflorescence     lentgh 28 - 30 cm  (11.2" - 12")  
  nr flowers 1
  size single flower 9 L 7 cm (3.6" L 2.8")
  duration single flower ≈ 35 days 
  time to bloom from birth, ≈ 90 days 
     
CITES appendix I

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