loose·strife 
(lsstrīf′)
(lsstrīf′)n.
1. Any of various plants of the genus Lythrum, having spikes of purple or white flowers, especially the purple loosestrife.
2. Any of various perennial plants of the genus Lysimachia, having usually yellow flowers.
[Mistranslation of Latin lȳsimachīa (as if from Greek lusis, loosening + Greek makhē, battle), from Greek lūsimakheios, perhaps after Lūsimakhos, Lysimachos, Greek physician of the fifth or fourth century BC.]