Euphorbia ampliphylla (also called Euphorbia winklerii and Euphorbia obovalifolia) is a succulent rainforest tree of the montane rainforests throughout East Africa and belonging to the Spurge Family (Euphorbiaceae).

The branches are each about eight inches (20 centimeters) in diameter and are succulent and three-winged and pachycaulous.

The toxicity of many euphorbs is well known, but no specific information is available concerning E. ampliphylla.

[2] It is particularly noted for two things: It is the tallest of all known succulent plants, definitely up to 98 feet (30 meters)[3] and indicated on a carefully scaled diagram as reaching 105 feet (32 meters).

[4] As most other succulent members of the genus Euphorbia, its trade is regulated under Appendix II of CITES.