A genus of tropical trees native to Central and South America, related to the rubber tree and producing a rubber-like sap.
A Latinized genus name, likely derived from a Spanish place name or person's name in the scientific tradition. Named formally in botanical taxonomy during the colonial era.
Castilloa trees were actually the original source of rubber for indigenous peoples in Central America—latex comes from these trees, not just from Hevea! European scientists only 'discovered' rubber through contact with the New World.
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