pennywort

noun

1. any of several plants having round or roundish leaves, as the navelwort.

noun

1. Also called: navelwort a crassulaceous Eurasian rock plant, Umbilicus rupestris (or Cotyledon umbilicus), with whitish-green tubular flowers and rounded leaves
2. a marsh plant, Hydrocotyle vulgaris, of Europe and North Africa, having circular leaves and greenish-pink flowers: family Hydrocotylaceae
3. a gentianaceous plant, Obolaria virginica, of E North America, with fleshy scalelike leaves and small white or purplish flowers
4. any of various other plants with rounded penny-like leaves