Any of certain flowering plants of the genera Lythrum and Lysimachia, which are not closely related.

plural of loosestrife

A semi-aquatic herbaceous plant, Lythrum salicaria, having long spikes of purple flowers, native to Eurasia, considered invasive in North America and New Zealand.

plural of purple loosestrife

The moth Papaipema lysimachiae, whose larvae bore the stems and roots of Lysimachia quadrifolia (whorled loosestrife).

plural of loosestrife borer