Confined to the tropical and subtropical montane rainforests of Hainan Island, this rare evergreen conifer stands as a unique representative of the island's botanical diversity. It typically grows under the canopy of dense moist forests, relying on high humidity and protection from direct sunlight.
Its natural populations have faced significant declines due to deforestation and targeted harvesting for pharmaceutical research. It is currently under strict state protection in China to prevent extinction in the wild.
This subspecies develops into a medium-sized tree, occasionally reaching 15 meters in height with a broad, rounded crown. The bark is reddish-brown or grayish, peeling off in fibrous flakes as the tree matures.
Distinct features of this subspecies include:
This taxon is globally recognized as a primary source of homoharringtonine, an alkaloid approved for the treatment of chronic myeloid leukemia. Scientific institutions carry out controlled cultivation and cell-culture research to harvest these medicinal compounds sustainably.
The seeds of this subspecies are often dispersed by small mammals that eat the fleshy aril, although the seed itself contains toxic compounds. Because of its narrow endemic range and high medicinal value, it is considered one of the most critically protected gymnosperms in southern China.
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