Dandelions (lion’s teeth) are an excellent food source; tasty, nutritious, and completely free. And you can find them almost anywhere, they grow as weeds throughout most of North America, Europe, Asia, and Africa. The greens are a very nutritious and relatively high-protein food, the flowers are edible and can be used to make wine, and the roots are an effective appetite stimulant.
For a plant, dandelions have a rather high-quantity of good-quality protein (14% protein by weight). For this reason, they can function rather effectively as a survival food if need be. They also contain high levels of a variety of different vitamins and minerals; in particular magnesium, calcium, potassium, vitamin C, B vitamins, and Vitamin A (carotenes).