Joannesia princeps, the arara nut-tree or andá-açu, is a species of moderate-sized tree in the family Euphorbiaceae, with a spreading canopy, large alternate and long petioled leaves, and coarse branches.

Flowers are monoecious, and fruit is a large drupe.

It is endemic to east Minas Gerais, north Espírito Santo to the south of Bahia, Brazil, and threatened by habitat loss.

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