(This plant comes in a 3.5" pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
Description: Espostoa melanostele is an attractive tall, greyish-green columnar cactus with much apical spination and pubescence, the hoary hairiness providing them a sturdy and more or less clean-cut appearance. It is similar to Espostoa lanata, but has rows of yellow needle-like spines; densely covered with white hair, the density increasing with age.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz