The Calathea Lancifolia (aka the rattlesnake calathea) has beautiful long wavy leaves with dark green splotches on them. The undersides of the leaves are a deep purple color.
Calatheas love humidity, so place them near a humidifier or on a pebble tray. Otherwise they will get crispy brown tips on their leaves.
Calatheas also like to be in medium to low light, as bright direct sunlight will scorch their leaves. Water when the top inch of soil is dry. They don’t like to dry out completely between waterings.
Use filtered water instead of tap water, as tap water is filled with salts and chlorine which causes the tips of the leaves to burn and brown.
They are also non toxic to cats and dogs, so this is a perfect pet friendly plant!