milfoil

A composite herb, Achillea Millefolium, also called yarrow.

A common composite herb (Achillea Millefolium) with white flowers and finely dissected leaves; yarrow.

an aquatic herb with dissected leaves (Myriophyllum).

Any of several pungent Eurasian herbs, of the genus Achillea

ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America