Crassula tetramera is a herb in the family Crassulaceae.

The annual herb has an erect habit and typically grows to a height of 10 centimetres (3.9 in).

It is found on upper slopes and summits in the Great Southern, Wheatbelt and Goldfields-Esperance regions of Western Australia where it grows in stony sandy-loam soils over quartzite or granite.

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