The nightshades have an ominous reputation, but this large plant family is more than just its most poisonous members, like belladonna. It contains more than 2,400 different species, including some of the most widely consumed fruits and vegetables in the world, such as potatoes, tomatoes and peppers.

By analyzing the fossil record through molecular data, scientists had estimated that the nightshade family was about 30 million years old, making it a relatively young plant family. But paleontologists in the Patagonia region in Argentina have discovered 52 million-year-old fossilized tomatillos, which are also nightshades. The discovery could push the age of the entire plant family, perhaps, back to when dinosaurs roamed the Earth.

Tomatillos are like the tomato’s oddball cousin. They are small, green and covered in a papery husk, which makes them look like Chinese lanterns. The berry beneath the sheath is the key ingredient in a tangy, zesty salsa verde. Until now, researchers thought tomatillos first evolved about 10 million years ago. But the new findings suggest that the fruits are actually five times that old. Because tomatillos are thought to be an evolutionarily young member of the nightshade group, the recent finding suggests that the entire family may be much older than scientists had previously estimated.