Crassula perfoliata is the type species of the genus Crassula, in the succulent/flowering plant family Crassulaceae, where it is placed in the subfamily Crassuloideae. Formally described by Linnaeus in 1753 as one of 10 species of Crassula, the plant is endemic to Southern Africa, where it may be found in Eswatini, Mozambique, South Africa and Zimbabwe.

Crassula perfoliata var. falcata, known as the airplane plant or airplane propellers, is arguably the best-known in cultivation; this popular variety has gained the Royal Horticultural Society (RHS) Award of Garden Merit.

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