This is what I wrote in that older post,
"Although the presence of the poison in the roots of a plant species does not guarantee that the poison is also present in other parts such as the buds or flowers it certainly means that the species may produce the poison in other plant parts under some conditions or sometimes."
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Basically, all the cells of a plant are genetically identical (note, for example, pollen has 1/2 the genes that other cells have, some cells may have a new mutation in a gene, etc.). That means if the plant can make something in one part then it has the ability to make it in any part.
As an example, some daylily cultivars have flowers with anthocyanin pigments. That means those cultivars have the ability to make anthocyanin pigments in any part of the plant. Usually they do not do so. However, there are some of those cultivars that make some anthocyanin pigment in their seed pods under some conditions. There are some of those cultivars that make anthocyanin pigment in the bases of their leaves under some conditions. It is next to impossible to guarantee that no genotype will make a compound in some other plant part under some conditions some time.
Secondly, even if a plant makes something in its roots and makes the same thing in its flowers, we may be able to eat the flowers safely but the roots may or may not be safe. That could be because the amount of the substance normally made in the roots could be high but the amount normally made in the flowers could be very low. The effects a substance has on us depend on how much of it we eat or drink and how quickly (amongst other things). As an example, we eat rhubarb stalks but eating rhubarb leaves is not recommended. They both contain the substance that is considered a problem but the mature leaves contain twice as much as the mature stalks. However, there could be occasions or conditions when the amount in the stalks is higher than normal.
Toxicity can be very complex; these are only some of the factors that could affect the toxicity of daylily roots.
