முள்ளு வேங்கை

Spinous Kino tree (Bridelia retusa)

African Milk Bush

African Milk bush ( Synadenium grantii)

வெள்ளை காட்டுகொட்டை

Jatropha glandulifera 

Weed along the road side,  Cheran Maa Nagar, Coimbatore.

Fire on the mountain

Fire on the Mountain Euphorbia cyathophora

Spurges are commonly herbs, with milky sap

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முள்ளரசன்

Sandbox tree (Hura crepitans) Family Euphorbiaceae

These spines have caused it to be called  Monkey no-climb. Ref. Wikipedia