Author: Jan Scholten
Names: Cotyledon umbilicus; Umbilicus pendulinus.
English: Pennywort; Navelwort; Kidneywort; Wall Pennywort; Wall Pennyroyal; Penny Pies.
Names: Cotyledon, Greek kotyle, a cup, alluding to its round, slightly concave leaves; round form of the leaf like a coin.
Source: Wadstories 1, Vera Kopsky.