The leaves of the rhubarb plant are poisonous and should not be consumed, as they contain high levels of oxalic acid which can be harmful to humans.
The stalks are edible, the leaves poisonous
No part of a rattlesnake is poisonous, including the skin. However, they do produce a venom that is dangerous if injected but not if consumed.
The rhubarb plant has edible stalks, which are commonly used in cooking, but its leaves are toxic if ingested due to high levels of oxalic acid. It's important to only consume the stalks of rhubarb and avoid the leaves.
A poisonous plant is most poisonous when it is ingested or comes into direct contact with the body. The toxicity level depends on various factors such as the plant species, the part of the plant consumed, the amount consumed, and the sensitivity of the individual. The concentration of toxins can also vary depending on factors like plant maturity and environmental conditions.
Rhubarb is the whole plant. You eat the stalks of the plant.
The edible part of the rhubarb grows above ground.
Rhubarb.
The Stem
All of it. the part you eat is the stalks
Belladonna is a poisonous flowering plant so I'm not sure what it has in common with rhubarb, which is edible, as far as I know they're not related. I believe the tomato is distantly related to the Belladonna which is why people a long time ago thought it was poisonous as well. I'm not familiar with the other two plants, someone posted jack in the pulpit has edible leaves(?) No part of the Belladonna is edible! But it was used in folk and Native American medicine and is still used in small quantities in homeopathic medicine, such as for acne but not enough to be harmful. I found out jack/pulpit is poisonous as well and grows from a corm. Dogbane secretes a milky substance as does belladonna and is poisonous as well. So 3 of the 4 are poisonous....rhubarb has roots that can be used as a laxative, but it's not poisonous. So I really don't know if they have much in common.
The poisonous part of the butterfly is infact the legs
Cosmos are part of the Asteraceae family of plants and as such should not be toxic to canines.