na·vel·wort 
(nāvəl-wûrt′, -wôrt′)
(nāvəl-wûrt′, -wôrt′)n.
1. Any of various Eurasian plants of the genus Omphalodes, having cymes of usually blue flowers and nutlets with a navellike depression on one side.
2. See pennywort.
[Sense 2, from the navellike depression in the center of its leaves.]