During my research, what I got to know about Calotropis is that they are a cattle poison as well as an arrow poison. It is also one of the most dangerous weeds.
You might have seen Datura in various colours like white, purplle, yellow, etc. It has many medicinal benefits, such as improving hair growth, fertility, etc.
One of the most popular poisonous plants in India is Plumeria as it can cause you skin rashes. This plant is also termed as Frangipani.
The plan has big leaves and you will mostly find it in the offices. But it has poisonous leaves so make sure to stay away.
Rosary Pea, or you can say Abrus precatorius, has a cluster of red and black beans. But this plant contains a strong toxin called abrin.