Poisonous plants, again, from their deadly properties, have been held in the same repute;[27] and it is a very common practice among American Indians to hang a small bag containing poisonous herbs around the neck of a child, "as a talisman against diseases or attacks from wild beasts." It is commonly supposed that a child so protected is proof against every hurtful influence, from the fact of its being under the protection of the special spirits associated with the plant it wears.
Again, closely allied to beliefs of this kind is the notion of plants as the habitation of the departing soul, founded on the old doctrine of transmigration.

Hence, referring to bygone times, we are told by Empedocles that "there are two destinies for the souls of highest virtue -- to pass either into trees or into the bodies of lions."[28] Amongst the numerous illustrations of this mythological conception may be noticed the story told by Ovid,[29] who relates how Baucis and Philemon were rewarded in this manner for their charity to Zeus, who came a poor wanderer to their home.

It appears that they not only lived to an extreme old age, but at the last were transformed into trees.

Ovid, also, tells how the gods listened to the prayer of penitent Myrrha, and eventually turned her into a tree.

Although, as Mr.Keary remarks, "she has lost understanding with her former shape, she still weeps, and the drops which fall from her bark (_i.e._, the myrrh) preserve the story of their mistress, so that she will be forgotten in no age to come." The sisters of Phaethon, bewailing his death on the shores of Eridanus, were changed into poplars.