They arise from nodes of 1–3-year-old branchlets or can be terminal. Cylindrical in shape, they are composed of a central woody spike, from which a large number of compact floral units arise perpendicularly to it.
These structures develop from branches that are one to three years old, or they can be terminal. They have a cylindrical form and consist of a central woody stem with many compact flower clusters growing at right angles to it.