Pseudolithos horwoodii is a species of succulent plant in the genus Pseudolithos.

[1] 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.

[2] Its growth habit is squat, unbranched, and blob-like, living up to the name of its genus which means "false stone".

[3] Its color is green to grayish brown.

[4] This Apocynaceae article is a stub.