Stachys, a genus of plants in the mint family, heal-all, self-heal, woundwort, betony, lamb's ears, hedgenettle.
Valeriana officinalis, a species in the valerian family.
Prunella vulgaris, a species in the mint family.
Stachys byzantina, an ornamental low-growing perennial related to betony with soft, silky hairs on the leaves which give it an attractive silvery-gray color.
Used other than figuratively or idiomatically: see lamb, ear.