Pachypodium baronii var.windsorii

Geographic & Climate

Geographic Coordinates: 12°18'S to 12°23'S, 49°15'E to 49°20'E (Windsor Castle massif, Beantely, and Amboaizamikono massifs, extreme northern Madagascar)

Climate Classification: Tropical Savanna / Tropical Dry Climate (Aw / Am)

Habitat Characteristics: Altitude range of 270–390 meters above sea level. Thrives on steep calcareous outcrops, vertical limestone cliffs, and rocky slopes in full sun or light shade within open dry forests and wooded grasslands. Soils are mineral-rich, highly porous, and sharply draining.

Botanical Morphology

Diagnostic Features: Distinguished from the type species (Pachypodium baronii) by its smaller overall dimensions, a globose to bottle-shaped caudex (30–50 cm tall, 35–60 cm in diameter), shorter inflorescence peduncles, and remarkably flat, deep crimson-red flowers (approx. 50 mm in diameter) featuring a pale green-yellow center star. Branches are sparsely produced (1–5), slender, twisting, and armed with paired, puberulent conical prickles that turn grey and glabrous with age. Leaves are deep green, glossy, subcoriaceous, and prominently bullate with deeply impressed reticulate venation above.

Growth Habit: Deciduous succulent shrub. Enters a strict winter dormancy dropping all leaves. Slow-growing, ultimately reaching a height of 0.5 to 1.5 meters.

History & Etymology

Etymology: The species epithet baronii honors Rev. Richard Baron (a British botanist and missionary in Madagascar), while the varietal name windsorii references the Windsor Castle massif in northern Madagascar, where the type specimen was discovered.

Historical Context: First collected in the remote limestone formations of the extreme north of Madagascar, this distinct variety captured the attention of caudex enthusiasts due to its exceptionally vibrant red flowers—making it one of the most coveted and striking miniature tree-like forms in the genus Pachypodium.