Are all plants with milky sap poisonous?

[Rajesh Sethi]

I know most of them are poisonous and are restricted to plant near house with small children.

Is there any exception to it?

 

[Daren]

Not all but most are mildly toxic to the skin and some are vary poisonous. There are a few that are not and some that are even edible, for instance Dandelions have a milky sap in the flower stem but the leaves and roots are great to eat if your larder is empty or you want to try something different.

 

[zigs]

You wouldn't want to get spurge sap anywhere near your eyes or dangly bits, but like Daren said, Dandelions make great coffee

 

[Daren]

You wouldn't want to get spurge sap anywhere near your eyes or dangly bits, but like Daren said, Dandelions make great coffee

That could be bad rolling around on Spurge unprotected there are better places

 

[Marck]

Not all plants with milky latex are poisonous, but many are.
It is better to know the exact identity of a plant or mushroom, than to judge edibility on some general rule-of-thumb to which there is likely many exceptions. After all there are many plants without milky latex that are poisonous as well.

Many members of the Dogbane Family (Apocynaceae) and Spurge Family (Euphorbiaceae), especially Euphorbia, produce milky latex, and many are poisonous, but there are some edible members as well. For example, the popular fruit, Natal-plum (Carissa macrocarpa), in the Dogbane Family (Apocynaceae) oozes milky latex even when it is ripe, but it is considered a choice edible and is often made into jams or eaten fresh.

Other plant families that contain many species that produce milky latex include the Mulberry Family (Moraceae), the Poppy Family (Papaveraceae), and the Chickory Tribe (Cichorieae) of the Daisy Family (Asteraceae). Again, some species are edible and others are poisonous.