I know that there are exceptions to every rule. Like for example not all plants with leaves in groups of 3 are poisonous.
Also there is mimicry in some plants to deter animals from eating it even though it isn't poisonous.
So is there a way to tell without having to do this sequence of steps:
1) Separate the parts of the plant.
2) Check for worms.
3) Put parts of the plant on your skin making sure to wait 8 hours before testing the next part. If it is contact poisonous discontinue the testing of that part.
4) Put the part of the plant that isn't contact poisonous on your lip and wait 8 hours. If there are any side effects discontinue the testing.
5) Put the part of the plant that isn't contact poisonous on your tongue without chewing and wait 8 hours. If there are any side effects discontinue the testing.
6) Chew the part of the plant that isn't contact poisonous and wait 8 hours. If there are any side effects discontinue the testing.
7) Swallow the part of the plant that isn't contact poisonous and wait 8 hours. If there are any side effects discontinue the testing.
8) Optional: Cook the plant and test the same way you did the raw plant. Sometimes poison in raw plants isn't there in cooked plants.