Navelwort n. : A European perennial succulent herb (Cotyledon umbilicus), having round, peltate leaves with a central depression; -- also called pennywort, and kidneywort.

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Taxonomy
Umbilicus rupestris, Navelwort, Cotyledon umbilicus, Umbilicus, juice, free encyclopedia, plant, Wall pennywort, scientific name, pennywort, pain, leaf, skin, unrelated, herbs, distilled water, effectual, stone.

Defination from the web:
Navelwort, Penny-pies, Wall Pennywort) is a fleshy, perennial, edible flowering plant in the stonecrop family Crassulaceae ... Navelwort is also assumed to be the "Kidneywort" referred to by Nicholas Culpepper in the English Physician, although it may actually ...