That would be a spike node. Spikes are the bumpy area on a flower. The spike node is the main area while a plant grows. The fleshy node around this spiked node is called the column. This is where the flower houses its stamens and pistils.
The fleshy area of the orchid is called the spike nodes which is considered the spikes or bumpy areas of the flower. This is the main area where the plant is growing.