The Collaborative International Dictionary
Saw-wort \Saw"-wort`\, n. (Bot.) Any plant of the composite genus Serratula; -- so named from the serrated leaves of most of the species.
Serratula tinctoria, commonly known as dyer's plumeless saw-wort or saw-wort, is a species in the genus Serratula. It is a native of Europe and a thistle like flower head. It grows in moist soil, full sun to part shade, and grows up to one metre tall.
This is an introduced plant in a small area of the northeastern United States, where it is called the Dyer's plumeless saw-wort.