Euphobiaceae: Euphorb Family
This family consists of a wide array of different plants. There are approximately 300 genera and 7,500 species. Some of these plants are mistaken for cacti because the family has members that have adapted succulent, photosynthetic stems, highly reduced leaves and spines. Very different however from cacti, is the presence of milky sap and the unique structure of the flowers. Many Euphorbs like Jathropa are extremely toxic.
Systematics: Euphorbs are all unisexual flowers. They range from 1) normally developing flowers to reduced flowers (maybe even just naked pistils) to 3) a highly reduced cyatheum. Cyatheums look like normal flowers but instead are many flowers combined into one structure that looks like a normal flower. The family has milky sap. There are peltate hairs. There are 3 carpels, 3 locules and 3 style branches.
Links to more information
Video from an species in this Family: Leafy Spurge with Rob Nelson