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Achillea ligustica
http://www.dipbot.unict.it/orto/0363-1.html
Image of this species.
Achillea millefolium
http://www.cloudnet.com/~djeans/FlwPlant/Yarrow.htm
Description and uses of yarrow with photos.
Achillea millefolium
http://www.hawriverprogram.org/NCPlants/Achillea_millefolium_page.html
Images of entire plant, leaf, and flower.