Good-King-Henry

[goo d-king-hen-ree] /ˈgʊdˌkɪŋˈhɛn ri/
noun, plural Good-King-Henries.
1.
a European, chenopodiaceous weed, Chenopodium bonus-henricus, naturalized in North America, having spinachlike leaves.
Also called mercury.
Origin
1895-1900