Euphorbia horombensis

Origin
Euphorbia horombensis is endemic to Madagascar, specifically localized in the Ihosy District within the Horombe Plateau. It was officially described in 1993. This species is highly restricted in its geographic distribution, making it a prized rarity for collectors.

Habitat
In its natural environment, it thrives on granite and gneiss rock outcrops. It grows in the shallow soil of rock crevices at altitudes of approximately 1,000 meters above sea level. The habitat is characterized by a sub-arid climate with intense sun exposure and distinct seasonal variations.

Description
Euphorbia horombensis is a densely branching, succulent shrub known for its architectural form and colorful floral details.

Growth Habit: It forms a low-growing, deciduous shrub that can reach up to 1 meter in height. The plant branches profusely from the base, creating a dense, thorny silhouette.

Stems: The branches are cylindrical, typically 10 to 15 mm thick, and display a dull green to brownish-green hue.

Spine Shields & Spines: The stems are armed with prominent, elongated spine shields (5–8 mm long) that do not form a continuous horny margin. Each shield bears a pair of diverging primary spines (up to 15 mm long) and two smaller stipular spines.

Flowers (Cyathia): It produces attractive clusters of bright yellow cyathia at the branch tips. The nectar glands are notable for their vivid yellow color, which contrasts beautifully against the rugged stems.

Cultivation: It is a slow-growing but hardy species in cultivation. It requires full sun to maintain its compact habit and excellent drainage provided by a mineral-rich substrate. It must be kept warm and mostly dry during its winter rest period.