Pachypodium eburneum
(This plant comes in a 3.5 inch 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).
Flowers: Large, showy, ivory colored with a yellow tint in the center throat.
Cultivation and propagation: They seem to be rot-prone under less than ideal conditions and care. Water sparingly and give extra well-drained soil to avoid waterlogged conditions. It is best not to let this plant dry out completely for any length of time. It is sensitive to cold and should be kept warm at all times. It tends to lose its leave and go dormant in winter when watering should be reduced to a minimum. It likes full sun.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz
