Initially, Europeans confused the identity and medicinal uses of the "Acorus calamus" of the Romans and Greeks with their native "Iris pseudacorus". Thus the "Herbarius zu Teutsch", published at Mainz in 1485, describes and includes a woodcut of this iris under the name "Acorus". This German book is one of three possible sources for the French "Le Grant Herbier", written in 1486, 1488, 1498 or 1508, of which an English translation was published as the "Grete Herball" by Peter Treveris in 1526, all containing the false identification of the "Herbarius zu Teutsch". William Turner, writing in 1538, describes 'acorum' as "gladon or a flag, a yelowe floure delyce".