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This is a discussion on Odm hallii 'xanthinum' within the Phalaenopsis, Oncidium, & Intergenerics IN BLOOM forums, part of the Orchid Photography category; I have just looked this up in IOSPE, to check the xanthinum variety, and yes, ...
I have just looked this up in IOSPE, to check the xanthinum variety, and yes, I see that the type flower has far more large blotches of the rich chestnut brown colour. I must see if any of the South American nurseries can bring me one, next time they come to London - this one came from one of them probably at a show last year. The first flowering for me.
Good big flowers, about 3 inches high . There is an oddity I have not seen before ; when the flowers first open the lip is held up so that you can see the underside of it, and it hides the column. As the flower matures, the lip is lowered - until it reaches the normal position for an oncidium/odontoglossum - and what a magnificent lip it is ! I suppose that all this is a mechanism for keeping pollinators at bay, until the flower is ready to receive them.
Very pretty species!