I thought the same as Psyched. According to book by Howard Wood, The Dendrobiums, flowers on most recent mature lead, abaxial/pseudoterminal upto 15 flowers. flower diameter more than 7.5 cm, lasts up to 2 months, and bloom time is variable.
For the culture he said it was Intermediate, lots of light and water year round, vulnerable to stem and root rot, suggest mounts better than pots. He considered it a difficult plant to bloom from seedling.
Sorry for long post, thought I'd give info too. What ever it is, is very nice, enjoy.
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