It is an erect annual plant that grows from 15 to 30 cm tall.

This species lacks a scape but has cymose inflorescences that are 5–11 cm long.

S. fluminense is found in northwestern Australia, including confirmed locations in the Hamersley Ranges and the Harding River near Karratha.

Its typical habitat is sheltered sites with persistent moisture in sandstone gorges.

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