Here is an unregistered hybrid from Sunset Valley blooming for the first time. It is spiking on three growth. So it is pretty floriferous.
I love the color, and for those who are into fragrance it is highly fragrant throughout the day.
I have this one. Yours is blooming like it should although rather odd time to bloom??
I bought mine in the winter and it came with a tiny little spike that gave me three flowers. Meh~ haha
I was very surprised about the timing of the blooms but decided not to question it. My three dendrobium tetragonum bloomed a few weeks again for the second time this year.
In my experience, the size of Dendrobium kingianum highly dependent on the kingianum clone used. The few I have have never reached over 16 inches.