Called the common dandelion, its proper name is
taraxacum officinale, which means the "Official Remedy for Disorders."
It is so well respected, in fact, that it appears in the U.S. National Formulatory, and in the Pharmacopeias of Hungary, Poland, Switzerland, and the Soviet Union. It is one of the top 6 herbs in the Chinese herbal medicine chest.
According to the USDA Bulletin #8, "Composition of Foods" (Haytowitz and Matthews 1984), dandelions rank in the top 4 green vegetables in overall nutritional value. Minnich, in "Gardening for Better Nutrition" ranks them, out of all vegetables, including grains, seeds and greens, as tied for 9th best. According to these data, dandelions are nature's richest green vegetable source of beta-carotene, from which Vitamin A is created, and the third richest source of Vitamin A of all foods, after cod-liver oil and beef liver! They also are particularly rich in fiber, potassium, iron, calcium, magnesium, phosphorus and the B vitamins, thiamine and riboflavin, and are a good source of protein.
Studies in Russia and Eastern Europe by Gerasimova, Racz, Vogel, and Marei (Hobbs 1985) indicate that dandelion is also rich in micronutrients such as copper, cobalt, zinc, boron, and molybdenum, as well as Vitamin D.