Venus

The Venus flytrap gets the "Venus" part of its name because its flowers are really pretty (like the goddess Venus) and are white, like the planet Venus in the sky. The plant is not from Venus. The "Flytrap" part comes from its obvious bug-eating attributes. This is, however...what shall I call it? A "comfortable fallacy." You often see this story maintained in books about carnivorous plants, but this is because of an article that John Ellis wrote in 1768. This is what you would call a cover story:

"...and from the beautiful Appearance of its Milk-white Flowers, and the Elegance of its Leaves, thought it well deserved one of the Names of the Goddess of Beauty, and therefore called it Dionaea."