As ES stated, there is a growth point inside each bract (= leaf). It can produce either an inflorescence, or a new growth. If from the top of the pseudobulb, it is often weaker than the inflorescences emerging from the base of the PB.
Young plants usually produce only a single inflorescence and a single growth. Mature plants can do 2-3 inflorescences and two new growths.
In Germany I once saw a large group of various Oncids, and virtually all plants had either 3 or 4 inflorescences. I have never seen this so consistently on plants blooming for the 2nd time, but not really mature size yet. I suspect that they have been given some kind of 'chemical help'.
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Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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