Chenopodium bonus-henricus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Erect or ascending, thick-rooted perennial to 7 dm; lvs numerous, long-petioled, broadly triangular-hastate, to 12 cm, entire or undulate; fls in small glomerules aggregated into a terminal, branching, paniculiform infl; sep mostly 4 or 5, erose; styles 2(3), persistent and conspicuous, 1–1.5 mm in fr; seeds all or mostly erect, black, shining, lenticular with a raised margin, 1.5–2 mm wide; 2n=36. Native of Europe, occasionally found as a weed in our range.
good King Henry