Prunella vulgaris, a species in the mint family.
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.
A North American perennial herb, Pedicularis canadensis, which is a partial root parasite and has been used in traditional medicine.