Valeriana officinalis, a species in the valerian family.
Stachys, a genus of plants in the mint family, heal-all, self-heal, woundwort, betony, lamb's ears, hedgenettle.
Prunella vulgaris, a species in the mint family.
A solution to all problems.
A remedy believed to cure all disease and prolong life that was originally sought by alchemists; a cure-all.