Euphorbia virosa, the Gifboom or poison tree, is a plant of the spurge family Euphorbiaceae.

Paired thorns grow in regularly spaced intervals from the edges.

[1] Euphorbia virosa is commonly distributed from the Orange River in South Africa to Southern Angola, and occurs throughout the Namib Desert, mainly on rocky slopes.

[2] The plant contains within the branches a milky and creamy substance with carcinogenic properties.

This substance is very poisonous and is used by San (Bushmen) to dip the tips of their hunting arrows.