This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The follicle when ripe contains many seeds, which are shaken out by the wind, and this causes dispersal over a wide area.
A cluster-cup fungus, Puccinia umbilici, is to be found upon it.
Cotyledon, Dioscori-des, is from the Greek cotule, cup, in allusion to the hollow form of the leaves, and the Latin umbilicus also refers to their shape and character.
Pennywort is also called Bachelor's Buttons, Corn-leaves, Cups-and-saucers, Cut-finger, Penny Grass, Wall-penny Grass, Hipwort, Jack-in-the-bush, Kidney-wort, Lady's Navel, Lover's Links, Maid-in-the-Mist, Milk-the-cows, Money-pennies, Navel-wort, Venus Navelwort, Pancakes, Penny Caps, Penny-cake, Penny Hat, Penny Leaves, Penny Pies, Penny-plates, Penny Wall, Great Stonecrop, Wallwort. The plant is called Corn-leaves because it was once applied to corns and warts, and Hipwort "for that it easeth the paines of the hippes", and Kidney-wort "because it helpeth the kidneys".
Essential Specific Characters: 112. Cotyledon Umbilicus-Veneris, L. - Stem succulent, erect, short, leaves radical, peltate, crenate, orbicular, flowers greenish-yellow, pendulous, in clusters or simple racemes.
Photo. Flatters & Garnett - Pennywort (Cotyledon Umbilicus -Veneris, L.)