Pachypodium lealii

Originally from Africa, this species has stems with numerous erect branches, green leaves up to 2.75' long. With regular water they will extend their branches rapidly. They normally flower white at the end of summer and then go dormant through fall and winter.

Recommended temperature zone: USDA: 10-12
Frost tolerance: Protect it on coldest nights, or keep it in container
Sun exposure: Light shade to full sun.
Origin: South Africa
Growth habits: Small, very slow growing caudiciform tree, typically 2 to 4' tall or less for any specimen of reasonable age
Watering needs: Regular water in summer when the plant has leaves, in winter, keep dry, with only occasional water
Propagation: Seeds
Blooming habits: has white flowers in the fall at the end of the summer growing season. They seem to need a cooler winter dormancy to bloom properly. They generally bloom at a younger age than other Pachypodiums typically around 4-5 years old.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz