|
John
I have also been looking at this. There seems to be a
number of articles mentioning only a few CAM orchids but they all basically say
that it is mostly found amongst the orchids with thick leathery leaves (>1mm
thick), and more so in species occurring in the forest canopy or open
areas.
One of the better articles I have come across so far is "The
occurrence of crassulacean acid metabolism among vascular epiphytes from Central
Panama" by G. Zotz and H. Ziegler in New Phytol. (1997), 137,223-229.
Here he lists about 20 CAM species out of the 50
analyzed.
Klaus Winter also did a lot of work on CAM and I'm sure he
lists quite a number of orchids (including Australian ones). He confirms
that the greatest uncertainty concerning the number of CAM plants exists in the
Orchidaceae.
Hope this helps a little.
Frikkie Marais
South Africa |
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