Crassula muscosa, rattail crassula, a succulent plant native to South Africa
Houttuynia cordata, chameleon plant, a herbaceous perennial plant native to Japan, Korea, southern China and Southeast Asia.
Used other than figuratively or idiomatically: see lizard, tail.
Saururus cernuus, a medicinal and ornamental plant native to eastern North America.
Caltha palustris, a perennial plant with bright yellow flowers.