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.
Any of several plant species of the genus Pedicularis and others.
Odontites vernus (red bartsia)
Pedicularis palustris (marsh lousewort)
Pedicularis flammea