pen·ny·wort 
(pĕnē-wûrt′, -wôrt′)
(pĕnē-wûrt′, -wôrt′)n.
1.
a. Any of various creeping aquatic or semiaquatic plants of the genus Hydrocotyle, having round or oval scalloped leaves and small white or greenish flowers grouped in umbels.
b. A Eurasian plant (Umbilicus rupestris) having fleshy peltate leaves and a tall stalk of yellowish-green flowers. Also called navelwort.
2. Any of various other plants having rounded leaves suggestive of pennies.
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