Rapicactus booleanus is a species of plant in the family Cactaceae.

Rapicactus booleanus grows solitarily with a tuberous root connected to the stem by a narrow neck 1–5 cm (0.39–1.97 in) long.

The hard, spirally arranged tubercles are closely set, 4-angled, rhomboid, somewhat flattened and almost truncated above, and somewhat horny or keeled below.

There are 2 erect central spines, whitish with dark brown tips, measuring 12–21 mm (0.47–0.83 in) long.

[1] Plants are found growing in gypsum outcrops near San Roberto, Nuevo León and in general Mexico.