Hey Swamper,
Didn't mean to leave you hanging - just got involved with other things. The easy answer is experience. Vanda merrillii - like other brown-flowered species (e.g. V. hindsii) - has the sepals and petals equal in size and lying in one plane. The Fairchild plant has slightly twisted, smaller petals which reflex and a conspicuously larger dorsal sepal - all features from V. tricolor. In addition, I have never seen a V. merrillii without a brown lip midlobe. Finally, V. merrillii has glossy flowers that look like they are lacquered. The Fairchild plant lacks this gloss.
Vanda merrillii was used in early breeding because it flowers at the equator without any seasonality. Thus there are a lot of old hybrids mislabelled as V. merrillii (often awarded by the AOS a species).
Hope that helps, Eric
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