Stillingia rigida (Muell. Arg.) Baillon = Sebastiania rigida (Muell. Arg.) Muell. Arg.
English:
rigidus,-a,-um;

https://archive.org/stream/mobot31753002146162#page/330/mode/2up
homotypic synonyms:
Croton rigidus (Muell. Arg.) Britton; Gymnanthes rigida Muell. Arg.; Sebastiania rigida (Muell. Arg.) Muell. Arg.;

protologue: Adansonia 5: 330 (1865)

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