Marginal

Water pennyworts,Hydrocotyles, are very common.They have long creeping stems that often form dense mats, often in and near ponds, lakes, rivers, and marshes, and some species in coastal areas by the sea.

Leaves
Simple, with small leafy outgrowth at the base, kidney shaped to round. Leaf edges are scalloped. The leaf surfaces ofHydrocotyleare prime grounds for ovipositionof many butterfly species.