Benna alternifolia is a species of flowering plant in family Melastomataceae. It is a perennial evergreen herb up to 1.2 meters in diameter, endemic to Guinea's Benna Plateau from 300 to 800 meters elevation.Benna alternifolia Burgt & Ver.-Lib. Plants of the World Online. Retrieved 30 October 2023.
It grows on vertical sandstone rock faces in deep shade with year-round moisture, in canyons 10–100 m deep or in the deep shade of trees.
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