As you mentioned, it's hard to ID without photos of the flowers. Even then, ID will mostly be a guess, since the plant is unlabeled. Also, I'm not a Dendrobium expert, so this is more of a shot in the dark based on context.
I think a reasonable guess would be that this is Dendrobium moniliforme, a closely related species, or a hybrid thereof. This would make sense given your region and given it's grown together with Vanda falcata.
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