butterwort

[buht-er-wurt, -wawrt] /ˈbʌt ərˌwɜrt, -ˌwɔrt/
noun
1.
any small, carnivorous plant of the genus Pinguicula, having leaves that secrete a viscid substance in which small insects are caught.
Origin
1590-1600; butter + wort2
British Dictionary definitions for butterwort

butterwort

/ˈbʌtəˌwɜːt/
noun
1.
a plant of the genus Pinguicula, esp P. vulgaris, that grows in wet places and has violet-blue spurred flowers and fleshy greasy glandular leaves on which insects are trapped and digested: family Lentibulariaceae