Trithrinax is a genus of flowering plants in the subfamily Coryphoideae of the family Arecaceae. The name is derived from ancient Greek, where tri means three, and thrinax trident. It was named in 1837 by Carl Friedrich Philipp von Martius, a German botanist and explorer.

Trithrinax species are spiny fan palms native to South America. They are resistant to cold, heat, wind, drought, poor soils and other adverse environmental conditions. Seeds germinate fast, but their overall growth rate is distinctly slow.

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