Araliaceae: Hydrocotyle and coin-shaped leaves in the aquarium

The Araliaceae are mostly land plants, from ivy to ginseng, but the genus Hydrocotyle has species that live in water and along banks. In the aquarium they are recognised by round, coin-like leaves on creeping or flexible stems, and by growing very fast with few demands. One of them, Hydrocotyle ranunculoides, is an invasive species in Spain and should not be confused with the aquarium ones.