ancient manual facilitating the identification of plants for medicinal purposes. Hundreds of medicinal plants were known in India before the Christian era, and the Chinese have a compilation, still authoritative, of 1,892 ancient herbal remedies. The Greeks had written accounts, and, according to the elder Pliny (Pliny the Elder), the physician Crateuas (early 1st century BC) produced a herbal with coloured illustrations. This has not survived but was probably largely embodied in the De materia medica of the Greek physician Pedacius Dioscorides. A Byzantine version of his famous herbal is the Constantinopolitan, or Viennese, Codex (c. AD 512). Some of its illustrations are probably derived from Crateuas, together with plant names, such as Anemone and Anagallis, which are still in use. Many manuscript herbals, drawing largely from Dioscorides and Pliny, were published in medieval Europe; during the 15th century several were printed, a notable one being Konrad von Megenberg's Das puch der natur (or Buch der natur, “Book of Nature”). When printed in 1475, it included the first known woodcuts for botanical illustrations. Very few original drawings were prepared for herbals before the 16th century: illustrations were copies and copies of copies. They became highly stylized, not only ceasing to resemble the plants depicted but also incorporating mythological notions. “Narcissus,” for example, in Jacob Meidenbach's Hortus sanitatis (1491), is unidentifiable: a human figure, instead of the plant's sex organs, emerges from each perianth (sepals and petals of a flower).