NEW OCCURRENCE OF TWO EXOTIC HYDROPHYTES AZOLLA FILICULOIDES LAM. AND HYDRILLA VERTICELLATA (L. F.) ROYLE IN TIGRIS RIVER WITHIN MOSUL CITY
The present research is a scientific documentation of a historical environmental event, which is the invasion of two species of non-native (exotic) aquatic plants for the Tigris River flowing in Mosul city center near Al-Dandan water gloves purification plant.One of them is Azolla filiculoides Lam., a fern belonging to the family Salviniaceae, the