The Collaborative International Dictionary of English v.0.48:

good-king-henry \good-king-henry\ n.
   A European plant (Chenopodium bonus-henricus) naturalized
   in North America; often collected from the wild as a potherb.

   Syn: good king henry, allgood, fat hen, wild spinach,
        Chenopodium bonus-henricus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chenopodium bonus-henricus
    n 1: European plant naturalized in North America; often
         collected from the wild as a potherb [syn: good-king-
         henry, allgood, fat hen, wild spinach, Chenopodium
         bonus-henricus]