Please identify this plant. Is it a member of Euphorbiaceae?
Cultivated, photographed on side of Lodi road, New Delhi.
Same plant has the green as well as variegated branches. Only a narrow region along the leaf margin is colourless. When sectioned the colourless part had cells without or very few green chloroplasts while the green parts of some leaves have green chloroplasts in all the mesophyll cells, some other leaves have green chloroplasts only in the middle region with the pallisade and lower spongy parenchyma layers devoid of them and some other leaves have green chloroplasts in all the cells except the pallisade layers. Any idea how the colourless cells form only at the margins?