Pseudolithos horwoodii is a species of succulent plant in the genus Pseudolithos. Native to arid areas of Somalia, it is a small, leafless plant up to 80 millimetres (3.1 in) tall and 45–60 millimetres (1.8–2.4 in) wide. Its growth habit is squat, unbranched, and blob-like, living up to the name of its genus which means "false stone". Its color is green to grayish brown.

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