Restricted to the unique limestone scrublands and coastal habitats of Cuba, Castela alaternifolia exhibits highly specialized xerophytic features. This woody plant is endemic to the Caribbean island, thriving in areas with low rainfall and rocky soils. It represents a resilient component of Cuba's native flora.
The species has adapted to survive under intense sunlight and dry conditions. It plays a role in stabilizing fragile coastal soils against wind erosion.
The physical structure of this plant reflects its survival strategy in dry habitats. Several key morphological characteristics define the species:
The roots form a shallow but highly branched network to rapidly absorb seasonal rainfall. The waxy coating on the leaves helps the plant retain moisture.
The specific epithet alaternifolia suggests that the leaves resemble those of the buckthorn genus Alaternus. This resemblance highlights an evolutionary convergence in leaf shape among plants in Mediterranean and dry tropical climates.
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