| 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) : | ||
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| 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 |
