English: Water wisteria or Hydrophila diffiformis shows Hetrophylly which is occurance of two different leaf morphology in a same plant. A special case of plasticity is represented by heterophylly, the ability of semi-aquatic plants to produce different types of leaves below and above water. Submerged leaves are thin and lack both a cuticle and stomata, whereas aerial leaves are thicker, cutinized and bear stomata.