Euphorbia viguieri ankarafantsiensis
(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: Euphorbia viguieri is a very plant with an angular, bright green stem with vertical, spiralling whitish thorns and vibrant red top-knots of floral parts. It is not a cactus, although it looks like one.
Cultivation and propagation: Euphorbia viguieri is a very ornamental species, easy to grow and suited for any well drained soil on bright light. It can be cultivated in open air in tropical or subtropical climate zones, in full sun, or (preferably) in light shade, on perfectly draining calcareous soils. But young plant are happy growing indoors too.
Growing rate: It is a slow grower.
Exposure: bright light to full sun.
Hardiness: protect from frost.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz