warerfallanim.gif (29374 bytes) Many water plants rely more on vegetative reproduction than on seeds for dispersal. In vegetative reproduction fragments of plants, or specialised structures may be carried away by water currents to grow elsewhere. This kind of reproduction is asexual. Canadian Pond Weed introduced into Britain has spread entirely this way. All known populations in Europe are solely female. However, seeds are still important for dispersal in other water plants. Plants which produce their flowers well above the water level often have seeds that will float and are dispersed by water. However not all plants which grow above the water have water dispersed seeds.
Plants such as Pond Iris grow in or near freshwater. The seed pods break open when they ripen. Those which fall into the water float away. The seeds may be dispersed long distances in this way. They can either germinate in the water or when they become stranded on mud. 09120040.jpg (360333 bytes)